Powered by Deep Web Technologies
Note: This page contains sample records for the topic "junction greenfield grundy" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


1

Greenfield Wind | Open Energy Information  

Open Energy Info (EERE)

Wind Wind Jump to: navigation, search Name Greenfield Wind Facility Greenfield Wind Sector Wind energy Facility Type Community Wind Facility Status In Service Owner Greenfield Wind Power LLC (community owned) Energy Purchaser City of Greenfield - excess to Central Iowa Power Cooperative Location Greenfield IA Coordinates 41.29064139°, -94.48559761° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":41.29064139,"lon":-94.48559761,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

2

Greenfield Solar | Open Energy Information  

Open Energy Info (EERE)

Greenfield Solar Greenfield Solar Jump to: navigation, search Name Greenfield Solar Place Oberlin, Ohio Product Developer of combined hot water and concentrator photovoltaic systems using in-house, proprietary cell architecture. Coordinates 41.292925°, -82.217354° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":41.292925,"lon":-82.217354,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

3

Performance Engineering of Service Compositions John Grundy  

E-Print Network [OSTI]

and performance analysis, and discuss preliminary results from our research to date. We conclude with areasPerformance Engineering of Service Compositions John Grundy Dept Electrical and Computer research on tools for business process composition, performance engineering and dynamic system

Grundy, John

4

Grundy Center Mun Light & Power | Open Energy Information  

Open Energy Info (EERE)

Mun Light & Power Mun Light & Power Jump to: navigation, search Name Grundy Center Mun Light & Power Place Iowa Utility Id 7743 Utility Location Yes Ownership M NERC Location MRO Operates Generating Plant Yes Activity Generation Yes References EIA Form EIA-861 Final Data File for 2010 - File1_a[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Utility Rate Schedules Grid-background.png Commercial All Electric Commercial Commercial Rates Commercial Residential Rates Residential Average Rates Residential: $0.1020/kWh Commercial: $0.0871/kWh References ↑ "EIA Form EIA-861 Final Data File for 2010 - File1_a" Retrieved from "http://en.openei.org/w/index.php?title=Grundy_Center_Mun_Light_%26_Power&oldid=41077

5

1 CONFIDENTIAL1 CONFIDENTIAL GreenField Solar  

E-Print Network [OSTI]

Driving solar energy into mainstream deployment, without subsidies Thank You! #12;1 CONFIDENTIAL1 CONFIDENTIAL GreenField Solar: Testing and Reliability needs of CPV Systems DrField's Dense array design advantages: · Simpler optical alignment & relaxed tracking tolerances => o Lower O

Rollins, Andrew M.

6

City of Greenfield, Iowa (Utility Company) | Open Energy Information  

Open Energy Info (EERE)

Greenfield Greenfield Place Iowa Utility Id 7626 Utility Location Yes Ownership M NERC Location MRO NERC MRO Yes ISO MISO Yes Operates Generating Plant Yes Activity Generation Yes Activity Transmission Yes Activity Bundled Services Yes References EIA Form EIA-861 Final Data File for 2010 - File1_a[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Utility Rate Schedules Grid-background.png Commercial Rates Commercial Commercial Rates Single Phase (Outside city limits) Commercial Commercial Rates Three Phase Commercial Commercial Rates Three Phase (Outside city limits) Commercial Industrial Rates Industrial Residential Rates Residential Residential Rates - Outside city limits Residential

7

"Diffusion of Innovation: Solar Oven Use in Lesotho (Africa)." Grundy, William and Roy Grundy. Advances in Solar Cooking: Proceedings of the 2nd International Conference on Solar Cooker Use and Technology. Shyam S. Nandwani, ed. July 12-15, 1994.  

E-Print Network [OSTI]

"Diffusion of Innovation: Solar Oven Use in Lesotho (Africa)." Grundy, William and Roy Grundy. Advances in Solar Cooking: Proceedings of the 2nd International Conference on Solar Cooker Use and Technology. Shyam S. Nandwani, ed. July 12-15, 1994. pp. 240-247. 1 DIFFUSION OF INNOVATION: SOLAR OVEN USE

Noble, William Stafford

8

Nanotube junctions  

DOE Patents [OSTI]

The present invention comprises a new nanoscale metal-semiconductor, semiconductor-semiconductor, or metal-metal junction, designed by introducing topological or chemical defects in the atomic structure of the nanotube. Nanotubes comprising adjacent sections having differing electrical properties are described. These nanotubes can be constructed from combinations of carbon, boron, nitrogen and other elements. The nanotube can be designed having different indices on either side of a junction point in a continuous tube so that the electrical properties on either side of the junction vary in a useful fashion. For example, the inventive nanotube may be electrically conducting on one side of a junction and semiconducting on the other side. An example of a semiconductor-metal junction is a Schottky barrier. Alternatively, the nanotube may exhibit different semiconductor properties on either side of the junction. Nanotubes containing heterojunctions, Schottky barriers, and metal-metal junctions are useful for microcircuitry.

Crespi, Vincent Henry (Darien, IL); Cohen, Marvin Lou (Berkeley, CA); Louie, Steven Gwon Sheng (Berkeley, CA); Zettl, Alexander Karlwalter (Kensington, CA)

2003-01-01T23:59:59.000Z

9

Josephson junction  

SciTech Connect (OSTI)

A novel method for fabricating nanometer geometry electronic devices is described. Such Josephson junctions can be accurately and reproducibly manufactured employing photolithographic and direct write electron beam lithography techniques in combination with aqueous etchants. In particular, a method is described for manufacturing planar Josephson junctions from high temperature superconducting material.

Wendt, Joel R. (Albuquerque, NM); Plut, Thomas A. (Albuquerque, NM); Martens, Jon S. (Sunnyvale, CA)

1995-01-01T23:59:59.000Z

10

Josephson junction  

SciTech Connect (OSTI)

A novel method for fabricating nanometer geometry electronic devices is described. Such Josephson junctions can be accurately and reproducibly manufactured employing photolithographic and direct write electron beam lithography techniques in combination with aqueous etchants. In particular, a method is described for manufacturing planar Josephson junctions from high temperature superconducting material. 10 figs.

Wendt, J.R.; Plut, T.A.; Martens, J.S.

1995-05-02T23:59:59.000Z

11

Chaudhary, K., Dai, X., Grundy, J.C. , Experiences in Developing a Micro-payment System for Peer-to-Peer Networks, International Journal of Information Technology and Web Engineering, vol. 5, no. 1, 2010, IGI Global.  

E-Print Network [OSTI]

Global. Experiences in Developing a Micro-payment System for Peer-to-Peer Networks Kaylash Chaudhary11 Chaudhary, K., Dai, X., Grundy, J.C. , Experiences in Developing a Micro-payment System for Peer-to-Peer Networks, International Journal of Information Technology and Web Engineering, vol. 5, no. 1, 2010, IGI

Grundy, John

12

Solar Junction | Open Energy Information  

Open Energy Info (EERE)

Junction Jump to: navigation, search Name: Solar Junction Place: San Jose, California Zip: CA 95131 Sector: Efficiency, Solar Product: Solar Junction is developing high efficiency...

13

Holographic Josephson Junctions  

SciTech Connect (OSTI)

We construct a gravitational dual of a Josephson junction. Calculations on the gravity side reproduce the standard relation between the current across the junction and the phase difference of the condensate. We also study the dependence of the maximum current on the temperature and size of the junction and reproduce familiar results.

Horowitz, Gary T.; Santos, Jorge E.; Way, Benson [Department of Physics, University of California, Santa Barbara, California 93106-4030 (United States)

2011-06-03T23:59:59.000Z

14

A Holographic Josephson Junction  

E-Print Network [OSTI]

We construct a gravitational dual of a Josephson junction. Calculations on the gravity side reproduce the standard relation between the current across the junction and the phase difference of the condensate. We also study the dependence of the maximum current on the temperature and size of the junction and reproduce familiar results.

Gary T. Horowitz; Jorge E. Santos; Benson Way

2012-02-23T23:59:59.000Z

15

Holographic SIS Josephson Junction  

E-Print Network [OSTI]

We construct a holographic model for the superconductor-insulator-superconductor (SIS) Josephson junction at zero temperature by considering a complex scalar field coupled with a U(1) gauge field in the four dimensional Anti de Sitter soliton background. As a result, we successfully reproduce many characteristic features of the Josephson junction in condensed matter physics, such as the sine relation between the DC current and the phase difference across the junction.

Wang, Yong-Qiang; Cai, Rong-Gen; Takeuchi, Shingo; Zhang, Hai-Qing

2012-01-01T23:59:59.000Z

16

Quantum Junction Solar Cells  

Science Journals Connector (OSTI)

Quantum Junction Solar Cells ... Department of Electrical and Computer Engineering, University of Toronto, 10 Kings College Road, Toronto, Ontario, M5S 3G4, Canada ...

Jiang Tang; Huan Liu; David Zhitomirsky; Sjoerd Hoogland; Xihua Wang; Melissa Furukawa; Larissa Levina; Edward H. Sargent

2012-08-10T23:59:59.000Z

17

Josephson junction element  

SciTech Connect (OSTI)

A sandwich-type josephson junction element wherein a counter electrode is made of a mo-re alloy which contains 10-90 atomic-% of re. The josephson junction element has a high operating temperature, and any deterioration thereof attributed to a thermal cycle is not noted.

Kawabe, U.; Tarutani, Y.; Yamada, H.

1982-03-09T23:59:59.000Z

18

Three-junction solar cell  

DOE Patents [OSTI]

A photovoltaic solar cell is formed in a monolithic semiconductor. The cell contains three junctions. In sequence from the light-entering face, the junctions have a high, a medium, and a low energy gap. The lower junctions are connected in series by one or more metallic members connecting the top of the lower junction through apertures to the bottom of the middle junction. The upper junction is connected in voltage opposition to the lower and middle junctions by second metallic electrodes deposited in holes 60 through the upper junction. The second electrodes are connected to an external terminal.

Ludowise, Michael J. (Cupertino, CA)

1986-01-01T23:59:59.000Z

19

Holographic SIS Josephson Junction  

E-Print Network [OSTI]

We construct a holographic model for the superconductor-insulator-superconductor (SIS) Josephson junction at zero temperature by considering a complex scalar field coupled with a Maxwell field in the four-dimensional anti-de Sitter soliton background. From the gravity side we reproduce the sine relation between the Josephson current and the phase difference across the junction. We also study the dependence of the maximal current on the dimension of the condensate operator and on the width of the junction, and obtain expected results.

Yong-Qiang Wang; Yu-Xiao Liu; Rong-Gen Cai; Shingo Takeuchi; Hai-Qing Zhang

2012-09-23T23:59:59.000Z

20

Modeling Schottky barrier SINIS junctions  

E-Print Network [OSTI]

: cond-mat/0001269 J. K. Freericks, Georgetown University, Josephson Junction talk, 2001 #12;Josephson). J. K. Freericks, Georgetown University, Josephson Junction talk, 2001 S I S I I V V Ic #12 University, Josephson Junction talk, 2001 S N S I I V V Ic #12;Digital Electronics and RSFQ logic · Rapid

Freericks, Jim

Note: This page contains sample records for the topic "junction greenfield grundy" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Superconductive tunnel junction integrated circuit  

SciTech Connect (OSTI)

Josephson Junction integrated circuits of the current injection type and magnetically controlled type utilize a superconductive layer that forms both Josephson Junction electrode for the Josephson Junction devices on the integrated circuit as well as a ground plane for the integrated circuit. Large area Josephson Junctions are utilized for effecting contact to lower superconductive layers and islands are formed in superconductive layers to provide isolation between the groundplane function and the Josephson Junction electrode function as well as to effect crossovers. A superconductor-barrier-superconductor trilayer patterned by local anodization is also utilized with additional layers formed thereover. Methods of manufacturing the embodiments of the invention are disclosed.

Jillie, D.W. Jr.; Smith, L.N.

1984-02-07T23:59:59.000Z

22

Spin Torques in Magnetic and Superconducting Tunnel Junctions  

E-Print Network [OSTI]

Josephson Junctions . . . . . . . . . . . . . . . . . . . . .Nonlinear Dynamics in a Magnetic Josephson Junction . . . .in a magnetic Josephson junction. Phys. Rev. B, 86:

Hoffman, Silas Eli

2012-01-01T23:59:59.000Z

23

Macroscopic quantum tunneling in Josephson junctions -  

E-Print Network [OSTI]

Macroscopic quantum tunneling in Josephson junctions - a method to characterise a well-shielded low Theory 5 1. The classical theory of Josephson junctions . . . . . . . . . . . . . . . . . 9 1-Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 2. Josephson junction dynamics . . . . . . . . . . . . . . . . . . . . . . . . 15 2.1 The basics

Gross, Rudolf

24

Josephson junction Q-spoiler  

DOE Patents [OSTI]

An automatic Q-spoiler comprising at least one Josephson tunnel junction connected in an LC circuit for flow of resonant current therethrough. When in use in a system for detecting the magnetic resonance of a gyromagnetic particle system, a high energy pulse of high frequency energy irradiating the particle system will cause the critical current through the Josephson tunnel junctions to be exceeded, causing the tunnel junctions to act as resistors and thereby damp the ringing of the high-Q detection circuit after the pulse. When the current has damped to below the critical current, the Josephson tunnel junctions revert to their zero-resistance state, restoring the Q of the detection circuit and enabling the low energy magnetic resonance signals to be detected.

Clarke, John (Berkeley, CA); Hilbert, Claude (Austin, TX); Hahn, Erwin L. (Berkeley, CA); Sleator, Tycho (Berkeley, CA)

1988-01-01T23:59:59.000Z

25

Josephson junction Q-spoiler  

DOE Patents [OSTI]

An automatic Q-spoiler comprising at least one Josephson tunnel junction connected in an LC circuit for flow of resonant current therethrough. When in use in a system for detecting the magnetic resonance of a gyromagnetic particle system, a high energy pulse of high frequency energy irradiating the particle system will cause the critical current through the Josephson tunnel junctions to be exceeded, causing the tunnel junctions to act as resistors and thereby damp the ringing of the high-Q detection circuit after the pulse. When the current has damped to below the critical current, the Josephson tunnel junctions revert to their zero-resistance state, restoring the Q of the detection circuit and enabling the low energy magnetic resonance signals to be detected.

Clarke, J.; Hilbert, C.; Hahn, E.L.; Sleator, T.

1986-03-25T23:59:59.000Z

26

Duality in Josephson Junction Arrays  

E-Print Network [OSTI]

Various properties of mesoscopic two-dimensional Josephson junction arrays are reviewed. Particular attention is paid to structure of the topological excitations, charges and vortices, which are shown to be dual to each other. This duality persists in the presence of external magnetic fields and offset charges, which influence vortices and charges in an equivalent way. A double-layer junction array is also considered, where an even further reaching duality is discovered.

Ya. M. Blanter; Rosario Fazio; Gerd Schoen

1997-01-30T23:59:59.000Z

27

Electromagnetically Induced Transparency in a Double Well Atomic Josephson Junction  

E-Print Network [OSTI]

observation of these Josephson junction resonances. 2.dressed Bose condensed Josephson junction Let us consider ain a Double Well Atomic Josephson Junction J.O. Weatherall

Weatherall, J. O.; Search, C. P.

2009-01-01T23:59:59.000Z

28

Alexey Ustinov Two-level fluctuators in Josephson junctions Josephson junction as a tool to  

E-Print Network [OSTI]

Alexey Ustinov Two-level fluctuators in Josephson junctions Josephson junction as a tool;Alexey Ustinov Two-level fluctuators in Josephson junctions Outline JJ phase qubit Microwave spectroscopy. Ustinov. ArXiv:0909.3425 #12;Alexey Ustinov Two-level fluctuators in Josephson junctions Josephson tunnel

Fominov, Yakov

29

Precision measurement with an optical Josephson junction  

E-Print Network [OSTI]

We study a new type of Josephson device, the so-called "optical Josephson junction" as proposed in Phys. Rev. Lett. {\\bf 95}, 170402 (2005). Two condensates are optically coupled through a waveguide by a pair of Bragg beams. This optical Josephson junction is analogous to the usual Josephson junction of two condensates weakly coupled via tunneling. We discuss the use of this optical Josephson junction, for making precision measurements.

H. T. Ng; K. Burnett; J. A. Dunningham

2006-11-18T23:59:59.000Z

30

Precision measurement with an optical Josephson junction  

SciTech Connect (OSTI)

We present a theoretical study of a type of Josephson device, the so-called 'optical Josephson junction' [Y. Shin et al. Phys. Rev. Lett. 95, 170402 (2005).]. In this device, two condensates are optically coupled through a waveguide by a pair of Bragg beams. This optical Josephson junction differs from the usual Josephson junction where condensates are weakly coupled by tunneling through a barrier. We discuss the use of this optical Josephson junction, for making precision measurements.

Ng, H. T.; Burnett, K. [Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, Oxford OX1 3PU (United Kingdom); Dunningham, J. A. [School of Physics and Astronomy, University of Leeds, LS2 9JT (United Kingdom)

2007-06-15T23:59:59.000Z

31

Dynamics of Josephson-junction ladders  

SciTech Connect (OSTI)

We have numerically studied dynamical behaviors of Josephson-junction ladders consisting of [ital N][sub [ital p

Kim, J. (Department of Physics, Basic Science Research Institute, Pohang Institute of Science and Technology, Pohang P.O. Box 125, Kyungbuk 790-600 (Korea, Republic of) Division of Basic Science Research, Research Institute of Industrial Science and Technology, Pohang P.O. Box 135, Kyungbuk 790-600 (Korea, Republic of)); Choe, W.G.; Kim, S. (Department of Physics, Basic Science Research Institute, Pohang Institute of Science and Technology, Pohang P.O. Box 125, Kyungbuk 790-600 (Korea, Republic of)); Lee, H.J. (Department of Physics, Basic Science Research Institute, Pohang Institute of Science and Technology, Pohang P.O. Box 125, Kyungbuk 790-600 (Korea, Republic of) Division of Basic Science Research, Research Institute of Industrial Science and Technology, Pohang P.O. Box 135, Kyungbuk 790-600 (Korea, Republic of))

1994-01-01T23:59:59.000Z

32

Quantum effects in nanoscale Josephson junction circuits  

E-Print Network [OSTI]

Quantum effects in nanoscale Josephson junction circuits SILVIA CORLEVI Doctoral Thesis Stockholm Josephson junction arrays with SQUID geometry. TRITA FYS 2006:31 ISSN 0280-316X ISRN KTH/FYS/­06:31­SE ISBN study on single-charge effects in nanoscale Josephson junctions and Cooper pair transistors (CPTs

Haviland, David

33

Josephson-junction logic device  

SciTech Connect (OSTI)

A Josephson-junction logic device having inductances and forming and AND circuit is described comprising: at least two superconductive loops, each having at least two Josephson-junction elements and a loop inductance connected between each of at least two Josephson-junction elements; at least two logic input signal lines, operatively connected to receive input currents, for supplying logic input signals; a bias line, operatively connected to at least two super conductive loops, for supplying a bias current to at least two superconductive loops, the bias current satisfying the condition vertical bar I/sub ml/ vertical bar > vertical bar I/sub mo/ vertical bar, where I/sub ml/ is a first threshold current, for switching the AND circuit, determined when at least two logic input signal lines receive different magnitude input currents and where I/sub mo/ is a second threshold current for switching the AND circuit, determined when at least two logic input signal lines receive the same magnitude input currents; and output terminals, operatively connected to one of at least two Josephson-junction elements, for outputting a logic output signal as a result of a logic operation performed on the logic input signals, whereby an operating margin of the AND circuit is expanded.

Suzuki, H.

1987-12-01T23:59:59.000Z

34

The Junction Diode Basic Operation  

E-Print Network [OSTI]

section of the diode. The junction is the dividing line between the n-type and p-type sides. Thermal biased diode. Figure 1(b) shows the diode with a battery connected across it. The polarity of the battery. Figure 1(c) shows the diode with the battery polarity reversed. The battery now tends to cancel out

Leach Jr.,W. Marshall

35

Method of manufacturing Josephson junction integrated circuits  

SciTech Connect (OSTI)

Josephson junction integrated circuits of the current injection type and magnetically controlled type utilize a superconductive layer that forms both Josephson junction electrode for the Josephson junction devices on the integrated circuit as well as a ground plane for the integrated circuit. Large area Josephson junctions are utilized for effecting contact to lower superconductive layers and islands are formed in superconductive layers to provide isolation between the groudplane function and the Josephson junction electrode function as well as to effect crossovers. A superconductor-barrier-superconductor trilayer patterned by local anodization is also utilized with additional layers formed thereover. Methods of manufacturing the embodiments of the invention are disclosed.

Jillie Jr., D. W.; Smith, L. N.

1985-02-12T23:59:59.000Z

36

OBSERVATION OF ZERO POINT FLUCTUATIONS IN A RESISTIVELY SHUNTED JOSEPHSON TUNNEL JUNCTION  

E-Print Network [OSTI]

resistively shunted Josephson junctions in which quantumresistively shunted Josephson junction. For measurementresistively shunted Josephson junction in the quantum limit.

Koch, Roger H.

2012-01-01T23:59:59.000Z

37

Josephson junctions and dark energy  

E-Print Network [OSTI]

In a recent paper Beck and Mackey [astro-ph/0603397] argue that the argument we gave in our paper [Phys. Lett. B 606, 77 (2005)] to disprove their claim that dark energy can be discovered in the Lab through noise measurements of Josephson junctions is incorrect. In particular, they emphasize that the measured noise spectrum in Josephson junctions is a consequence of the fluctuation dissipation theorem, while our argument was based on equilibrium statistical mechanics. In this note we show that the fluctuation dissipation relation does not depend upon any shift of vacuum (zero-point) energies, and therefore, as already concluded in our previous paper, dark energy has nothing to do with the proposed measurements.

Philippe Jetzer; Norbert Straumann

2006-04-25T23:59:59.000Z

38

String junctions and holographic interfaces  

Science Journals Connector (OSTI)

In this paper we study half-BPS type IIB supergravity solutions with multiple AdS3S3M4 asymptotic regions, where M4 is either T4 or K3. These solutions were first constructed in [M. Chiodaroli, M. Gutperle, and D. Krym, J. High Energy Phys. 02 (2010) 066.] and have geometries given by the warped product of AdS2S2M4 over ?, where ? is a Riemann surface. We show that the holographic boundary has the structure of a star graph, i.e. n half-lines joined at a point. The attractor mechanism and the relation of the solutions to junctions of self-dual strings in six-dimensional supergravity are discussed. The solutions of [M. Chiodaroli, M. Gutperle, and D. Krym, J. High Energy Phys. 02 (2010) 066.] are constructed introducing two meromorphic and two harmonic functions defined on ?. We focus our analysis on solutions corresponding to junctions of three different conformal field theories and show that the conditions for having a solution charged only under Ramond-Ramond three-form fields reduce to relations involving the positions of the poles and the residues of the relevant harmonic and meromorphic functions. The degeneration limit in which some of the poles collide is analyzed in detail. Finally, we calculate the holographic boundary entropy for a junction of three CFTs and obtain a simple expression in terms of poles and residues.

Marco Chiodaroli, Michael Gutperle, Ling-Yan Hung, and Darya Krym

2011-01-05T23:59:59.000Z

39

Holographic p-wave Josephson junction  

E-Print Network [OSTI]

In this work we generalized holographic model for s-wave DC Josephson junction constructed in arXiv:1101.3326[hep-th] to a holographic description for p-wave Josephson junction. By solving numerically the coupled equations of motion of Yang-Mills theory for a non-Abelian SU(2) gauge fields in (3+1)-dimensional AdS spacetimes, we shown that DC current of the p-wave Josephson junction is proportional to the sine of the phase difference across the junction like the s-wave case.

Wang, Yong-Qiang; Zhao, Zhen-Hua

2011-01-01T23:59:59.000Z

40

Holographic p-wave Josephson junction  

E-Print Network [OSTI]

In this work we generalized holographic model for s-wave DC Josephson junction constructed in arXiv:1101.3326[hep-th] to a holographic description for p-wave Josephson junction. By solving numerically the coupled equations of motion of Yang-Mills theory for a non-Abelian SU(2) gauge fields in (3+1)-dimensional AdS spacetimes, we shown that DC current of the p-wave Josephson junction is proportional to the sine of the phase difference across the junction like the s-wave case.

Yong-Qiang Wang; Yu-Xiao Liu; Zhen-Hua Zhao

2011-09-20T23:59:59.000Z

Note: This page contains sample records for the topic "junction greenfield grundy" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

Microwave photonics with Josephson junction arrays  

E-Print Network [OSTI]

We introduce an architecture for a photonic crystal in the microwave regime based on superconducting transmission lines interrupted by Josephson junctions. A study of the scattering properties of a single junction in the line shows that the junction behaves as a perfect mirror when the photon frequency matches the Josephson plasma frequency. We generalize our calculations to periodic arrangements of junctions, demonstrating that they can be used for tunable band engineering, forming what we call a quantum circuit crystal. As a relevant application, we discuss the creation of stationary entanglement between two superconducting qubits interacting through a disordered media.

Zueco, David; Solano, Enrique; Garca-Ripoll, Juan Jos

2011-01-01T23:59:59.000Z

42

Dark energy and Josephson junctions  

SciTech Connect (OSTI)

It has been recently claimed that dark energy can be (and has been) observed in laboratory experiments by measuring the power spectrum S{sub I}(?) of the noise current in a resistively shunted Josephson junction and that in new dedicated experiments, which will soon test a higher frequency range, S{sub I}(?) should show a deviation from the linear rising observed in the lower frequency region because higher frequencies should not contribute to dark energy. Based on previous work on theoretical aspects of the fluctuation-dissipation theorem, we carefully investigate these issues and show that these claims are based on a misunderstanding of the physical origin of the spectral function S{sub I}(?). According to our analysis, dark energy has never been (and will never be) observed in Josephson junctions experiments. We also predict that no deviation from the linear rising behavior of S{sub I}(?) will be observed in forthcoming experiments. Our findings provide new (we believe definite) arguments which strongly support previous criticisms.

Branchina, Vincenzo [Department of Physics, University of Catania, Via Santa Sofia 64, I-95123, Catania (Italy); Liberto, Marco Di; Lodato, Ivano, E-mail: vincenzo.branchina@ct.infn.it, E-mail: madiliberto@ssc.unict.it, E-mail: ivlodato@ssc.unict.it [Scuola Superiore di Catania, Via S. Nullo 5/i, Catania (Italy)

2009-08-01T23:59:59.000Z

43

Quantum Junction Solar Cells Jiang Tang,,  

E-Print Network [OSTI]

Quantum Junction Solar Cells Jiang Tang,, Huan Liu,, David Zhitomirsky,§ Sjoerd Hoogland,§ Xihua, University of Toronto, 10 King's College Road, Toronto, Ontario, M5S 3G4, Canada *S Supporting Information-type and p-type materials to create the first quantum junction solar cells. We present a family

44

Junction Hilltop Wind | Open Energy Information  

Open Energy Info (EERE)

Junction Hilltop Wind Junction Hilltop Wind Jump to: navigation, search Name Junction Hilltop Wind Facility Junction Hilltop Wind Sector Wind energy Facility Type Community Wind Facility Status In Service Owner Community Owned Developer Tom Wind & Bill Sutton Energy Purchaser Interstate Power and Light (Alliant Energy) Location Grand Junction IA Coordinates 42.04671131°, -94.23969269° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":42.04671131,"lon":-94.23969269,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

45

Design of Flexible-Duct Junction Boxes  

Broader source: Energy.gov (indexed) [DOE]

Design of Flexible-duct Design of Flexible-duct Junction Boxes Robert Beach, IBACOS Duncan Prahl, IBACOS Design of Flexible-duct Junction Boxes Presentation Outline * Current Standards and Practice * Analysis Methods * Recommendations Design of Flexible-duct Junction Boxes * Detailed report is in peer review anticipated to be published T3 this year. - http://www1.eere.energy.gov/library/default.aspx?page=2&spi d=2. * Measure guide to be part of Building America Solutions Center - http://basc.pnnl.gov/ Design of Flexible-duct Junction Boxes Typical Installations As Plenum As Monster Design of Flexible-duct Junction Boxes Current Standards * ASHRAE 2012 HVAC Systems and Equipment, Box Plenum Systems Using Flexible Duct - Constrains Box Width to 2-3x Entrance Width - Constrains Box Length to 2 x Box Width

46

Delta Junction Wind Farm | Open Energy Information  

Open Energy Info (EERE)

Delta Junction Wind Farm Delta Junction Wind Farm Jump to: navigation, search Name Delta Junction Wind Farm Facility Delta Junction Sector Wind energy Facility Type Small Scale Wind Facility Status In Service Owner Alaska Environmental Power Developer Alaska Environmental Power Location South of Delta Junction AK Coordinates 64.069461°, -145.717661° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":64.069461,"lon":-145.717661,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

47

Grundy Electric Coop, Inc | Open Energy Information  

Open Energy Info (EERE)

7720 7720 Utility Location Yes Ownership C NERC Location SERC NERC SERC Yes Activity Distribution Yes References EIA Form EIA-861 Final Data File for 2010 - File1_a[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Utility Rate Schedules Grid-background.png Security Light 100 Watt HPS Lighting Security Light 175 Watt MVL Lighting Single Phase Service Small Phase Service 150 kW or less Street Light 100 Watt HPS Lighting Street Light 100 Watt MVL Lighting Street Light 175 Watt MVL Lighting Street Light 250 Watt HPS Lighting Average Rates Residential: $0.1040/kWh Commercial: $0.0818/kWh Industrial: $0.0761/kWh References ↑ "EIA Form EIA-861 Final Data File for 2010 - File1_a"

48

Self-consistent modeling of charge redistributions in Josephson junctions  

E-Print Network [OSTI]

Self-consistent modeling of charge redistributions in Josephson junctions J. K. Freericks, Josephson Junction talk, 2000 #12;Josephson Proximity-Effect Junctions · A Superconductor-Normal metal, Georgetown University, Josephson Junction talk, 2000 S N S I I V V Ic #12;Andreev Bound States · At an N

Freericks, Jim

49

Superconductor-Correlated metal-Superconductor Josephson junctions  

E-Print Network [OSTI]

Superconductor-Correlated metal- Superconductor Josephson junctions for high-speed digital. Freericks, Georgetown University, Josephson Junction talk, 2002 #12;Josephson Tunnel Junctions). J. K. Freericks, Georgetown University, Josephson Junction talk, 2002 S I S I I V V Ic #12

Freericks, Jim

50

Self-consistent modeling of SINIS and SNSNS Josephson junctions  

E-Print Network [OSTI]

Self-consistent modeling of SINIS and SNSNS Josephson junctions J. K. Freericks Collaborators: Paul of Naval Research. J. K. Freericks, Georgetown University, Josephson Junction talk, 2000 #12;Josephson University, Josephson Junction talk, 2000 S I S I I V V Ic #12;Josephson Proximity-Effect Junctions

Freericks, Jim

51

Tuning a short coherence length Josephson junction through a  

E-Print Network [OSTI]

Tuning a short coherence length Josephson junction through a metal-insulator transition J. K University, Josephson Junction talk, 2001 #12;Josephson Tunnel Junctions · A Superconductor maintaining nonhysteretic behavior. J. K. Freericks, Georgetown University, Josephson Junction talk, 2001 S N

Freericks, Jim

52

Tunnel junction multiple wavelength light-emitting diodes  

DOE Patents [OSTI]

A multiple wavelength LED having a monolithic cascade cell structure comprising at least two p-n junctions, wherein each of said at least two p-n junctions have substantially different band gaps, and electrical connector means by which said at least two p-n junctions may be collectively energized; and wherein said diode comprises a tunnel junction or interconnect. 5 figs.

Olson, J.M.; Kurtz, S.R.

1992-11-24T23:59:59.000Z

53

THE USE OF SUPERCONDUCTING JUNCTIONS IN MAGNETOMETRY By J. CLARKE,  

E-Print Network [OSTI]

-8 gauss. In the second part, we discuss the properties of a type of Josephson junction in which] junctions in parallel. A Josephson junction consists of two superconductors separated by an insulating =|03C8|ei~, where 1 03C8|2 represents the density of condensed pairs. In a Josephson junction

Boyer, Edmond

54

Do ridge^ridge^fault triple junctions exist on Earth? Evidence from the Aden^Owen^Carlsberg junction in  

E-Print Network [OSTI]

Transform and the East Paci¢c Rise and the Aden^ Owen^Carlsberg (AOC) triple junction between the Owen fracture zone (OFZ to the ridges. Here, we report the results of a marine geophysical survey of the AOC triple junction, which took.The AOC triple junction appears to be in a transient stage between a former triple junction of the ridge

Nicolas, Chamot-Rooke

55

Optoelectronic switching of addressable molecular crossbar junctions  

E-Print Network [OSTI]

This letter reports on the observation of optoelectronic switching in addressable molecular crossbar junctions fabricated using polymer stamp-printing method. The active medium in the junction is a molecular self-assembled monolayer softly sandwiched between gold electrodes. The molecular junctions are investigated through currentvoltage measurements at varied temperature (from 95 to 300 K) in high vacuum condition. The junctions show reversible optoelectronic switching with the highest on/off ratio of 3 orders of magnitude at 95 K. The switching behavior is independent of both optical wavelength and molecular structure, while it strongly depends on the temperature. Initial analysis indicates that the distinct binding nature of the molecule/electrode interfaces play a dominant role in the switching performance.

J. C. Li

2006-11-22T23:59:59.000Z

56

Thinfilm trilayer manganate junctions  

Science Journals Connector (OSTI)

...relation in the high temperature region between 130 K and room temperature. Figure reproduced from Sun et al. (1997...lowering of sample temperature. These junctions...caused by voltage distribution inside the base electrode...

1998-01-01T23:59:59.000Z

57

Quantum Coherence in a Superfluid Josephson Junction  

SciTech Connect (OSTI)

We report a new kind of experiment in which we take an array of nanoscale apertures that form a superfluid {sup 4}He Josephson junction and apply quantum phase gradients directly along the array. We observe collective coherent behaviors from aperture elements, leading to quantum interference. Connections to superconducting and Bose-Einstein condensate Josephson junctions as well as phase coherence among the superfluid aperture array are discussed.

Narayana, Supradeep; Sato, Yuki [Rowland Institute at Harvard, Harvard University, Cambridge, Massachusetts 02142 (United States)

2011-02-04T23:59:59.000Z

58

Greenfield, Massachusetts: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

article is a stub. You can help OpenEI by expanding it. article is a stub. You can help OpenEI by expanding it. Equivalent URI DBpedia Coordinates 42.5875857°, -72.5995339° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":42.5875857,"lon":-72.5995339,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

59

Greenfield, Iowa: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

4.4613543° 4.4613543° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":41.3052657,"lon":-94.4613543,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

60

Thermodynamic Signatures of Half-Quantum Vortices in p+ip Josephson Junction Arrays  

E-Print Network [OSTI]

bind a Majorana Fermion . . 3 Josephson Junction Arrays 3.14 p + ip Josephson Junction Arrays 4.1Bind a Majorana Fermion . . . . . . . . . Josephson Junction

Krahn, Graham Joel

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "junction greenfield grundy" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Temporal stability of Y Ba Cu O nano Josephson junctions from ion irradiation  

E-Print Network [OSTI]

planar high temperature Josephson junctions fabricated usingYBa 2 Cu 3 O 7-? Josephson junctions via nanolithography andsuperconductor Josephson junctions, J. Vac. Sci. Technol.

Cybart, Shane A.

2014-01-01T23:59:59.000Z

62

Abrikosov vortices in long Josephson junctions  

Science Journals Connector (OSTI)

We have developed a theory of the critical current Ic of a long Josephson junction in the presence of a finite density of Abrikosov vortices trapped in the electrodes in the immediate vicinity of the plane of the junction. We show that under these conditions the Josephson phase difference can be finite even well inside the junction in such a way as to result in a nonmonotonous dependence of Ic on the concentration of the perturbing vortices, a behavior at variance with that of a short junction. As the average distance between the vortices decreases, Ic reaches a maximum. The location, magnitude, and sharpness of this feature are strongly dependent on the ratio ??J/r0, where r0 and ? are respectively the range and the strength of the effective interaction between the Abrikosov vortices and the Josephson fluxons while ?J is the Josephson penetration length. The results obtained are used to discuss the behavior of the critical current recently observed in Josephson junctions based on Nb films.

Mikhail V. Fistul and Gabriele F. Giuliani

1998-10-01T23:59:59.000Z

63

Numerical Investigation of Josephson Junction Structures  

SciTech Connect (OSTI)

Multilayered long Josephson Junction Structures form an interesting physical system where both nonlinearity and interaction between subsystems play an important role. Such systems allow to study physical effects that do not occur in single Josephson junction.The Sakai-Bodin-Pedersen model--a system of perturbed sine-Gordon equations--is used to study the dynamic states of stacks of inductively coupled long Josephson Junctions (LJJs). The corresponding static problem is numerically investigated as well. In order to study the stability of possible static solutions a Sturm-Liouville problem is generated and solved.The transitions from static to dynamic state and the scenario of these transitions are analyzed depending on the model parameters. Different physical characteristics--current-voltage characteristics, individual instant voltages and internal magnetic fields, are calculated and interpreted.

Hristov, I.; Dimova, S.; Boyadjiev, T. [Faculty of Mathematics and Informatics, Sofia University 5 James Bourchier Blvd., 1164 Sofia (Bulgaria)

2009-10-29T23:59:59.000Z

64

Decoherence in a Josephson junction qubit  

E-Print Network [OSTI]

The zero-voltage state of a Josephson junction biased with constant current consists of a set of metastable quantum energy levels. We probe the spacings of these levels by using microwave spectroscopy to enhance the escape rate to the voltage state. The widths of the resonances give a measurement of the coherence time of the two states involved in the transitions. We observe a decoherence time shorter than that expected from dissipation alone in resonantly isolated 20 um x 5 um Al/AlOx/Al junctions at 60 mK. The data is well fit by a model including dephasing effects of both low-frequency current noise and the escape rate to the continuum voltage states. We discuss implications for quantum computation using current-biased Josephson junction qubits, including the minimum number of levels needed in the well to obtain an acceptable error limit per gate.

A. J. Berkley; H. Xu; M. A. Gubrud; R. C. Ramos; J. R. Anderson; C. J. Lobb; F. C. Wellstood

2003-03-01T23:59:59.000Z

65

Dynamical properties of high-temperature-superconductor granular bridge junctions: Inhomogeneous Josephson-junction-array model  

SciTech Connect (OSTI)

As an attempt to understand the dynamical behavior of the high-temperature-superconductor (HTSC) granular bridge junction, we model the granular HTSC bridge junction consisting of many small grains inside by an inhomogeneous Josephson junction array, i.e., randomly arranged Josephson junction arrays (JJA). To describe randomly distributed critical currents between the grains inside the HTSC granular bridge junction, we chose various possible configurations in {l_brace}{ital I}{sub {ital ij}}{sup {ital c}}{r_brace} and {l_brace}{ital R}{sub {ital ij}}{r_brace} for the one-dimensional (1D) and 2D inhomogeneous Josephson junctions, and calculated the current-voltage ({ital IV}) characteristics and self-radiation spectral densities of the 1D and 2D inhomogeneous Josephson junctions. As a result, depending upon the distribution of critical currents and shunted resistances, it is found that there are large variations of {ital IV} characteristics. In contrast to the appearance of giant Shapiro steps in the regular ordered array, such Shapiro steps disappear in the case of the disordered JJA due to the increased randomness in the distribution of critical currents. On the contrary, however, when there exists a correlation between critical currents and resistances, i.e., a constant Josephson voltage, {ital I}{sub {ital ij}}{sup {ital c}}{ital R}{sub {ital ij}}={ital V}{sub {ital J}} (constant), the fundamental Shapiro step emerges despite the disordered distribution of {ital I}{sub {ital ij}}{sup {ital c}}. The relevance of this model to the HTSC granular bridge junctions is discussed. In particular, experimentally observed dynamical behaviors of the HTSC granular bridge junctions are shown to be closely related to the case of the correlated distribution with constant Josephson voltage. {copyright} {ital 1996 The American Physical Society.}

Lee, J.; Lee, S.; Yu, J.; Park, G. [Department of Physics, Sogang University, Seoul 121-742 (Korea)] [Department of Physics, Sogang University, Seoul 121-742 (Korea)

1996-02-01T23:59:59.000Z

66

Axion physics in a Josephson junction environment  

E-Print Network [OSTI]

We show that recent experiments based on Josephson junctions, SQUIDS, and coupled Josephson qubits have a cosmological interpretation in terms of axionic dark matter physics, in the sense that they allow for analogue simulation of early-universe axion physics. We propose new experimental setups in which SQUID-like axionic interactions in a resonant Josephson junction environment can be tested, similar in nature to recent experiments that test for quantum entanglement of two coupled Josephson qubits. We point out that the parameter values relevant for early-universe axion cosmology are accessible with present day's achievements in nanotechnology.

Christian Beck

2011-11-23T23:59:59.000Z

67

Complementary junction heterostructure field-effect transistor  

DOE Patents [OSTI]

A complimentary pair of compound semiconductor junction heterostructure field-effect transistors and a method for their manufacture are disclosed. The p-channel junction heterostructure field-effect transistor uses a strained layer to split the degeneracy of the valence band for a greatly improved hole mobility and speed. The n-channel device is formed by a compatible process after removing the strained layer. In this manner, both types of transistors may be independently optimized. Ion implantation is used to form the transistor active and isolation regions for both types of complimentary devices. The invention has uses for the development of low power, high-speed digital integrated circuits. 10 figs.

Baca, A.G.; Drummond, T.J.; Robertson, P.J.; Zipperian, T.E.

1995-12-26T23:59:59.000Z

68

Holographic Josephson Junction in 3+1 dimensions  

E-Print Network [OSTI]

In arXiv:1101.3326[hep-th], a (2+1)-dimensional holographic Josephson junction was constructed, and it was shown that the DC Josephson current is proportional to the sine of the phase difference across the junction. In this paper, we extend this study to a holographic description for the (3+1)-dimensional holographic DC Josephson junction. By solving numerically the coupled differential equations, we also obtain the familiar characteristics of Josephson junctions.

Yong-Qiang Wang; Yu-Xiao Liu; Zhen-Hua Zhao

2011-04-21T23:59:59.000Z

69

Holographic Josephson Junction in 3+1 dimensions  

E-Print Network [OSTI]

In arXiv:1101.3326[hep-th], a (2+1)-dimensional holographic Josephson junction was constructed, and it was shown that the DC Josephson current is proportional to the sine of the phase difference across the junction. In this paper, we extend this study to a holographic description for the (3+1)-dimensional holographic DC Josephson junction. By solving numerically the coupled differential equations, we also obtain the familiar characteristics of Josephson junctions.

Wang, Yong-Qiang; Zhao, Zhen-Hua

2011-01-01T23:59:59.000Z

70

Phase Transition in Compact QED(3) and the Josephson Junction  

E-Print Network [OSTI]

We study the finite temperature phase transition in 2+1 dimensional compact QED and its dual theory: Josephson junction. Duality of these theories at zero temperature was established long time ago by Hosotani. Phase transition in compact QED is well studied and we employ the `duality' to study the superconductivity phase transition in a Josephson junction. For a thick junction we obtain a critical temperature in terms of the geometrical properties of the junction.

Vakif K. Onemli; Murat Tas; Bayram Tekin

2001-08-22T23:59:59.000Z

71

Solar Junction Develops World Record Setting Concentrated Photovoltaic Solar Cell  

Office of Energy Efficiency and Renewable Energy (EERE)

EERE supported the development of Solar Junction's concentrated photovoltaic technology that set a world record for conversion efficiency.

72

Superconductor-Correlated metal-Superconductor Josephson junctions  

E-Print Network [OSTI]

Superconductor-Correlated metal- Superconductor Josephson junctions for high-speed digital. Freericks, Georgetown University, Josephson Junction talk, 2002 #12;Digital Electronics and RSFQ logic, Georgetown University, Josephson Junction talk, 2002 X X Binary 0, no flux Binary 1, one flux quantum #12

Freericks, Jim

73

Localized mode interactions in 0-Josephson junctions Hadi Susanto1  

E-Print Network [OSTI]

Localized mode interactions in 0- Josephson junctions Hadi Susanto1 and Gianne Derks2 1 School of Mathematics, University of Surrey, Guildford, Surrey, GU2 7XH, UK A long Josephson junction containing regions in the system, it is shown that Josephson junctions with phase-shift can be an ideal setting for studying

Wirosoetisno, Djoko

74

Superconductor-Correlated metal-Superconductor Josephson junctions  

E-Print Network [OSTI]

Superconductor-Correlated metal- Superconductor Josephson junctions for high-speed digital. Freericks, Georgetown University, Josephson Junction talk, 2003 #12;Digital Electronics and RSFQ logic, Georgetown University, Josephson Junction talk, 2003 X X Binary 0, no flux Binary 1, one flux quantum #12

Freericks, Jim

75

Multi-Scroll and Hypercube Attractors from Josephson Junctions  

E-Print Network [OSTI]

Multi-Scroll and Hypercube Attractors from Josephson Junctions M¨us¸tak E. Yalc¸in Istanbul Leuven, Belgium Email: Johan.Suykens@esat.kuleuven.ac.be Abstract-- In this paper Josephson junctions of the Josephson junction in a general Jerk circuit in such a way that there is no need for synthesizing

76

SOME CHARACTERISTICS OF JOSEPHSON JUNCTIONS AS RADIATION DETECTORS  

E-Print Network [OSTI]

125 SOME CHARACTERISTICS OF JOSEPHSON JUNCTIONS AS RADIATION DETECTORS Yu. Ya. DIVIN, F. Ya. NAD les microponts. Abstract. 2014 The V-I characteristic of Josephson junction with an external parallel admittance, the high frequency impedance and high frequency response of a Josephson junction to small

Paris-Sud XI, Université de

77

PARAMETRIC EXCITATION OF PLASMA OSCILLATIONS IN JOSEPHSON JUNCTIONS  

E-Print Network [OSTI]

223 PARAMETRIC EXCITATION OF PLASMA OSCILLATIONS IN JOSEPHSON JUNCTIONS N. F. PEDERSEN, M. R'équation différentielle de Mathieu. Abstract. 2014 Experiments on a Josephson junction analog showed a parametric in Josephson junctions at finite voltages have been discussed earlier [1]-[4]. In this communication we report

Boyer, Edmond

78

Dependence of single molecule junction conductance on molecular conformation  

E-Print Network [OSTI]

1 Dependence of single molecule junction conductance on molecular conformation Latha Venkataraman1 of a single metal-molecule-metal junction depends not only on the chemical nature of the molecule used in unimolecular devices. Here, using amine link groups13 to form single molecule junctions, we show a clear

Hone, James

79

Fast algorithms for triangular Josephson junction arrays  

SciTech Connect (OSTI)

We develop fast algorithms for the numerical study of two-dimensional triangular Josephson junction arrays. The Dirac bra-ket formalism is introduced in the context of such arrays. We note that triangular arrays can have both hexagonal and rectangular periodicity and develop algorithms for each. Boundaries are next introduced and fast algorithms for finite arrays are developed. 40 refs., 4 figs.

Datta, S.; Sahdev, D. [Indian Institute of Technology, Kanpur (India)] [Indian Institute of Technology, Kanpur (India)

1997-04-01T23:59:59.000Z

80

Measuring Vacuum Polarization with Josephson Junctions  

SciTech Connect (OSTI)

We argue that the vacuum polarization by the virtual electron-positron pairs can be measured by studying a Josephson junction in a strong magnetic field. The vacuum polarization results in a weak dependence of the Josephson constant on the magnetic field strength which is within the reach of the existing experimental techniques.

Penin, Alexander A. [Department of Physics, University of Alberta, Edmonton, Alberta T6G 2J1 (Canada) and Institute for Nuclear Research of Russian Academy of Sciences, 117312 Moscow (Russian Federation)

2010-03-05T23:59:59.000Z

Note: This page contains sample records for the topic "junction greenfield grundy" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

Axion mass estimates from resonant Josephson junctions  

E-Print Network [OSTI]

Recently it has been proposed that dark matter axions from the galactic halo can produce a small Shapiro step-like signal in Josephson junctions whose Josephson frequency resonates with the axion mass [C. Beck, PRL 111, 231801 (2013)]. Here we show that the axion field equations in a voltage-driven Josephson junction environment allow for a nontrivial solution where the axion-induced electric current manifests itself as an oscillating supercurrent. The linear change of phase associated with this nontrivial solution implies the formal existence of a large magnetic field in a tiny surface area of the weak link region of the junction which makes incoming axions decay into microwave photons. We derive a condition for the design of Josephson junction experiments so that they can act as optimum axion detectors. Four independent recent experiments are discussed in this context. The observed Shapiro step anomalies of all four experiments consistently point towards an axion mass of $(110 \\pm 2)\\mu $eV. This mass value is compatible with the recent BICEP2 results and implies that Peccei-Quinn symmetry breaking was taking place after inflation.

Christian Beck

2014-06-10T23:59:59.000Z

82

Topological Order in Frustrated Josephson Junction Arrays  

E-Print Network [OSTI]

We show that electrically and magnetically frustrated Josephson junction arrays (JJAs) realize topological order with a non-trivial ground state degeneracy on manifolds with non-trivial topology. The low-energy theory has the same gauge dynamics of the unfrustrated JJAs but for different, "fractional" degrees of freedom, a principle reminescent of Jain's composite electrons in the fractional quantum Hall effect.

M. C. Diamantini; P. Sodano; C. A. Trugenberger

2008-06-02T23:59:59.000Z

83

Superconducting Topological Fluids in Josephson Junction Arrays  

E-Print Network [OSTI]

We argue that the frustrated Josephson junction arrays may support a topologically ordered superconducting ground state, characterized by a non-trivial ground state degeneracy on the torus. This superconducting quantum fluid provides an explicit example of a system in which superconductivity arises from a topological mechanism rather than from the usual Landau-Ginzburg mechanism.

M. Cristina Diamantini; Pasquale Sodano; Carlo A. Trugenberger

2006-04-21T23:59:59.000Z

84

Millimeter-Wave Mixing with Josephson Junctions  

Science Journals Connector (OSTI)

Experiments are reported in which two millimeter-wave signals incident on point-contact Josephson junctions produced changes in the junction dc voltage versus current characteristic and an intermediate frequency output whose amplitude depended sensitively on both junction bias and applied power. Equations are derived, based on Josephson's phenomenological equations, for the Josephson current in a junction exposed to two applied rf signals. When the applied signals differ appreciably in frequency, additional constant-voltage steps in the V-I curve are predicted which are spaced at the difference frequency. These steps have been observed in experiments employing sources at 64 and 72 Gc/sec. Results of mixing experiments utilizing two sources nearly equal in frequency are reported at 23 and at 72 Gc/sec. In this case the two waves beat together and are equivalent in their effect to a single signal amplitude modulated at the difference frequency. Also explained on the same basis are experiments in which the third harmonic of a signal at 24 Gc/sec mixed with a signal at 72 Gc/sec. These results demonstrate the existence of the Josephson mixing mechanism as opposed to classical nonlinear mixing, and they show that it is operative at microwave and millimeter-wave frequencies over a wide range of power.

C. C. Grimes and Sidney Shapiro

1968-05-10T23:59:59.000Z

85

Gallium nitride junction field-effect transistor  

DOE Patents [OSTI]

An all-ion implanted gallium-nitride (GaN) junction field-effect transistor (JFET) and method of making the same. Also disclosed are various ion implants, both n- and p-type, together with or without phosphorous co-implantation, in selected III-V semiconductor materials.

Zolper, John C. (Albuquerque, NM); Shul, Randy J. (Albuquerque, NM)

1999-01-01T23:59:59.000Z

86

Axion mass estimates from resonant Josephson junctions  

E-Print Network [OSTI]

Recently it has been proposed that dark matter axions from the galactic halo can produce a small Shapiro step-like signal in Josephson junctions whose Josephson frequency resonates with the axion mass [C. Beck, PRL 111, 231801 (2013)]. Here we show that the axion field equations in a voltage-driven Josephson junction environment allow for a nontrivial solution where the axion-induced electric current manifests itself as an oscillating supercurrent. The linear change of phase associated with this nontrivial solution implies the existence of a large magnetic field in a tiny surface area of the weak link region of the junction which makes incoming axions decay into microwave photons. We derive a condition for the design of Josephson junction experiments so that they can act as optimum axion detectors. Four independent recent experiments are discussed in this context. The observed Shapiro step anomalies of all four experiments consistently point towards an axion mass of $(110 \\pm 2)\\mu $eV. This mass value is com...

Beck, Christian

2014-01-01T23:59:59.000Z

87

Gallium nitride junction field-effect transistor  

DOE Patents [OSTI]

An ion implanted gallium-nitride (GaN) junction field-effect transistor (JFET) and method of making the same are disclosed. Also disclosed are various ion implants, both n- and p-type, together with or without phosphorus co-implantation, in selected III-V semiconductor materials. 19 figs.

Zolper, J.C.; Shul, R.J.

1999-02-02T23:59:59.000Z

88

Heat flow in nonlinear molecular junctions  

E-Print Network [OSTI]

We investigate the heat conduction properties of molecular junctions comprising anharmonic interactions. We find that nonlinear interactions can lead to novel phenomena: it negative differential thermal conductance and heat rectification. Based on analytically solvable models we derive an expression for the heat current that clearly reflects the interplay between anharmonic interactions, strengths of coupling to the thermal reservoirs, and junction asymmetry. This expression indicates that negative differential thermal conductance shows up when the molecule is strongly coupled to the thermal baths, even in the absence of internal molecular nonlinearities. In contrast, diode like behavior is expected for a highly anharmonic molecule with an inherent structural asymmetry. Anharmonic interactions are also necessary for manifesting Fourier type transport. We briefly present an extension of our model system that can lead to this behavior.

Dvira Segal

2005-12-22T23:59:59.000Z

89

Defect formation in long Josephson junctions  

SciTech Connect (OSTI)

We study numerically a mechanism of vortex formation in a long Josephson junction within the framework of the one-dimensional sine-Gordon model. This mechanism is switched on below the critical temperature. It is shown that the number of fluxons versus velocity of cooling roughly scales according to the power law with the exponent of either 0.25 or 0.5 depending on the temperature variation in the critical current density.

Gordeeva, Anna V. [Institute for Physics of Microstructures, RAS, GSP-105, Nizhny Novgorod 603950 (Russian Federation); Department of Physics, B309, Technical University of Denmark, DK-2800 Lyngby (Denmark); Pankratov, Andrey L. [Institute for Physics of Microstructures, RAS, GSP-105, Nizhny Novgorod 603950 (Russian Federation)

2010-06-01T23:59:59.000Z

90

Quantum dynamics in the bosonic Josephson junction  

SciTech Connect (OSTI)

We employ a semiclassical picture to study dynamics in a bosonic Josephson junction with various initial conditions. Phase diffusion of coherent preparations in the Josephson regime is shown to depend on the initial relative phase between the two condensates. For initially incoherent condensates, we find a universal value for the buildup of coherence in the Josephson regime. In addition, we contrast two seemingly similar on-separatrix coherent preparations, finding striking differences in their convergence to classicality as the number of particles increases.

Chuchem, Maya; Cohen, Doron [Department of Physics, Ben-Gurion University of the Negev, P.O.B. 653, Beer-Sheva 84105 (Israel); Smith-Mannschott, Katrina [Department of Physics, Wesleyan University, Middletown, Connecticut 06459 (United States); MPI for Dynamics and Self-Organization, Bunsenstrasse 10, D-37073 Goettingen (Germany); Hiller, Moritz [Physikalisches Institut, Albert-Ludwigs-Universitaet, Hermann-Herder-Strasse 3, D-79104 Freiburg (Germany); Kottos, Tsampikos [Department of Physics, Wesleyan University, Middletown, Connecticut 06459 (United States); Vardi, Amichay [Department of Chemistry, Ben-Gurion University of the Negev, P.O.B. 653, Beer-Sheva 84105 (Israel); Institute for Theoretical Atomic, Molecular and Optical Physics, Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138 (United States)

2010-11-15T23:59:59.000Z

91

Screening current effects in Josephson junction arrays  

E-Print Network [OSTI]

The purpose of this work is to compare the dynamics of arrays of Josephson junctions in presence of magnetic field in two different frameworks: the so called XY frustrated model with no self inductance and an approach that takes into account the screening currents (considering self inductances only). We show that while for a range of parameters the simpler model is sufficiently accurate, in a region of the parameter space solutions arise that are not contained in the XY model equations.

A. Petraglia; G. Filatrella; G. Rotoli

1995-07-28T23:59:59.000Z

92

q-deformed dynamics and Josephson junction  

E-Print Network [OSTI]

We define a generalized rate equation for an observable in quantum mechanics, that involves a parameter q and whose limit $q\\to 1$ gives the standard Heisenberg equation. The generalized rate equation is used to study dynamics of current biased Josephson junction. It is observed that this toy model incorporates diffraction like effects in the critical current. Physical interpretation for q is provided which is also shown to be q-deformation parameter.

Ramandeep S. Johal

2000-10-04T23:59:59.000Z

93

Peltier Junction heats and cools car seat  

SciTech Connect (OSTI)

Electrically heated seats may soon become heated and cooled seats. The design called the CCS module exploits the heat-pump capability of a class of semiconductor thermoelectric devices (TEDs) known as Peltier Junction. Every CCS module contain two TEDs. Heating and cooling occurs through convection and conduction. The heart of the system is the thermoelectric heat pump. This is originally conceived as the sole heating/cooling options for a prototype electric vehicle.

Gottschalk, M.A.

1994-10-10T23:59:59.000Z

94

Magnetism in Thiolated Gold Model Junctions  

Science Journals Connector (OSTI)

Magnetism in Thiolated Gold Model Junctions ... Nanoparticles revealing magnetism and their assemblies are of importance in nanotechnology and spintronics,(26, 27) in fundamental quantum-mechanical experiments,(28) and potentially in quantum computing. ... (47) Even though the magnetism has not yet been explicitly demonstrated in pure, neutral, and small thiolated AuNPs, it may be readily promoted by transition-metal doping of AuNP cores. ...

Mat Dubeck; Haibin Su

2012-07-24T23:59:59.000Z

95

Josephson junction in a thin film  

SciTech Connect (OSTI)

The phase difference {phi}(y) for a vortex at a line Josephson junction in a thin film attenuates at large distances as a power law, unlike the case of a bulk junction where it approaches exponentially the constant values at infinities. The field of a Josephson vortex is a superposition of fields of standard Pearl vortices distributed along the junction with the line density {phi}'(y)/2{pi}. We study the integral equation for {phi}(y) and show that the phase is sensitive to the ratio l/{Lambda}, where l={lambda}{sub J}{sup 2}/{lambda}{sub L}, {Lambda}=2{lambda}{sub L}{sup 2}/d, {lambda}{sub L}, and {lambda}{sub J} are the London and Josephson penetration depths, and d is the film thickness. For l<<{Lambda}, the vortex ''core'' of the size l is nearly temperature independent, while the phase ''tail'' scales as l{Lambda}/y{sup 2}={lambda}{sub J}2{lambda}{sub L}/d/y{sup 2}; i.e., it diverges as T{yields}T{sub c}. For l>>{Lambda}, both the core and the tail have nearly the same characteristic length l{Lambda}.

Kogan, V. G.; Dobrovitski, V. V.; Clem, J. R.; Mawatari, Yasunori; Mints, R. G.

2001-04-01T23:59:59.000Z

96

Single P-N junction tandem photovoltaic device  

DOE Patents [OSTI]

A single P-N junction solar cell is provided having two depletion regions for charge separation while allowing the electrons and holes to recombine such that the voltages associated with both depletion regions of the solar cell will add together. The single p-n junction solar cell includes an alloy of either InGaN or InAlN formed on one side of the P-N junction with Si formed on the other side in order to produce characteristics of a two junction (2J) tandem solar cell through only a single P-N junction. A single P-N junction solar cell having tandem solar cell characteristics will achieve power conversion efficiencies exceeding 30%.

Walukiewicz, Wladyslaw (Kensington, CA); Ager, III, Joel W. (Berkeley, CA); Yu, Kin Man (Lafayette, CA)

2012-03-06T23:59:59.000Z

97

Single P-N junction tandem photovoltaic device  

DOE Patents [OSTI]

A single P-N junction solar cell is provided having two depletion regions for charge separation while allowing the electrons and holes to recombine such that the voltages associated with both depletion regions of the solar cell will add together. The single p-n junction solar cell includes an alloy of either InGaN or InAlN formed on one side of the P-N junction with Si formed on the other side in order to produce characteristics of a two junction (2J) tandem solar cell through only a single P-N junction. A single P-N junction solar cell having tandem solar cell characteristics will achieve power conversion efficiencies exceeding 30%.

Walukiewicz, Wladyslaw (Kensington, CA); Ager, III, Joel W. (Berkeley, CA); Yu, Kin Man (Lafayette, CA)

2011-10-18T23:59:59.000Z

98

Pseudospherical Junctions or Josephson Effect, Backlund Transformations, and Fine Structure Coupling  

E-Print Network [OSTI]

, that the geometric phase evolution within M circularly and toroidally arranged virtual Josephson junctions (coupled by a special arrangement of Josephson junctions. In this con- text "virtual junction" means simply a scalar impedance will represent in this paper a "virtual Josephson junction". The Josephson junctions

Binder, Bernd

99

Fabrication of magnetic tunnel junctions with epitaxial and textured ferromagnetic layers  

DOE Patents [OSTI]

This invention relates to magnetic tunnel junctions and methods for making the magnetic tunnel junctions. The magnetic tunnel junctions include a tunnel barrier oxide layer sandwiched between two ferromagnetic layers both of which are epitaxial or textured with respect to the underlying substrate upon which the magnetic tunnel junctions are grown. The magnetic tunnel junctions provide improved magnetic properties, sharper interfaces and few defects.

Chang, Y. Austin (Middleton, WI); Yang, Jianhua Joshua (Madison, WI)

2008-11-11T23:59:59.000Z

100

Classical phase diffusion in small hysteretic Josephson junctions  

SciTech Connect (OSTI)

The existence of classical phase diffusion in hysteretic junctions is demonstrated by quantitative agreement between experimental and simulated {ital I}-{ital V} curves. The simulations are based on a circuit that accurately models both the junction and its external shunting impedance at microwave frequencies. We show that the bias current at which the junction switches from the phase diffusion state to the voltage state is sensitive to dissipation at microwave frequencies.

Martinis, J.M.; Kautz, R.L. (National Institute of Standards and Technology, Boulder, Colorado 80303 (US))

1989-10-02T23:59:59.000Z

Note: This page contains sample records for the topic "junction greenfield grundy" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

A Josephson Junction Microscope for Low-frequency Fluctuators  

E-Print Network [OSTI]

The high-Q harmonic oscillator mode of a Josephson junction can be used as a novel probe of spurious two-level systems (TLSs) inside the amorphous oxide tunnel barriers of the junction. In particular, we show that spectroscopic transmission measurements of the junction resonator mode can reveal how the coupling magnitude between the junction and the TLSs varies with an external magnetic field applied in the plane of the tunnel barrier. The proposed experiments offer the possibility of clearly resolving the underlying coupling mechanism for these spurious TLSs, an important decoherence source limiting the quality of superconducting quantum devices.

L. Tian; R. W. Simmonds

2007-05-10T23:59:59.000Z

102

Quantum manipulation and simulation using Josephson junction arrays  

E-Print Network [OSTI]

We discuss the prospect of using quantum properties of large scale Josephson junction arrays for quantum manipulation and simulation. We study the collective vibrational quantum modes of a Josephson junction array and show that they provide a natural and practical method for realizing a high quality cavity for superconducting qubit based QED. We further demonstrate that by using Josephson junction arrays we can simulate a family of problems concerning spinless electron-phonon and electron-electron interactions. These protocols require no or few controls over the Josephson junction array and are thus relatively easy to realize given currently available technology.

Xingxiang Zhou; Ari Mizel

2006-05-01T23:59:59.000Z

103

High-frequency rolloff in the response of junction detectors  

Science Journals Connector (OSTI)

A model is developed for junction detectors based on the antisymmetric electromagnetic-structure mode for two high-free-carrier-density regions separated by a slightly conductive...

Haas, David R; Yu, Theodore; Wurl, Jon G; Gustafson, T K

1985-01-01T23:59:59.000Z

104

Organic-Inorganic Hetero Junction White Light Emitting Diode.  

E-Print Network [OSTI]

?? The purpose of this thesis work is to design and fabricates organic-inorganic hetero junction White Light Emitting Diode (WLED). In this WLED, inorganic material (more)

Lubuna Beegum, Shafeek

2008-01-01T23:59:59.000Z

105

Non-relativistic Josephson Junction from Holography  

E-Print Network [OSTI]

We construct a Josephson junction in non-relativistic case with a Lifshitz geometry as the dual gravity. We investigate the effect of the Lifshitz scaling in comparison with its relativistic counterpart. The standard sinusoidal relation between the current and the phase difference is found for various Lifshitz scalings characterised by the dynamical critical exponent. We also find the exponential decreasing relation between the condensate of the scalar operator within the barrier at zero current and the width of the weak link, as well as the relation between the critical current and the width. Nevertheless, the coherence lengths obtained from two exponential decreasing relations generically have discrepancies for non-relativistic dual.

Huai-Fan Li; Li Li; Yong-Qiang Wang; Hai-Qing Zhang

2014-12-09T23:59:59.000Z

106

Non-relativistic Josephson Junction from Holography  

E-Print Network [OSTI]

We construct a Josephson junction in non-relativistic case with a Lifshitz geometry as the dual gravity. We investigate the effect of the Lifshitz scaling in comparison with its relativistic counterpart. The standard sinusoidal relation between the current and the phase difference is found for various Lifshitz scalings characterised by the dynamical critical exponent. We also find the exponential decreasing relation between the condensate of the scalar operator within the barrier at zero current and the width of the weak link, as well as the relation between the critical current and the width. Nevertheless, the coherence lengths obtained from two exponential decreasing relations generically have discrepancies for non-relativistic dual.

Li, Huai-Fan; Wang, Yong-Qiang; Zhang, Hai-Qing

2014-01-01T23:59:59.000Z

107

Synchronized Andreev transmission in SNS junction arrays.  

SciTech Connect (OSTI)

We construct a nonequilibrium theory for the charge transfer through a diffusive array of alternating normal (N) and superconducting (S) islands comprising an SNSNS junction, with the size of the central S island being smaller than the energy relaxation length. We demonstrate that in the nonequilibrium regime the central island acts as Andreev retransmitter with the Andreev conversions at both NS interfaces of the central island correlated via above-the-gap transmission and Andreev reflection. This results in a synchronized transmission at certain resonant voltages which in experiments is seen as a sequence of spikes in the differential conductivity.

Chtchelkatchev, N. M.; Baturina, T. I.; Glatz, A.; Vinokur, V. M.; Materials Science Division; Russian Academy of Sciences; Moscow Inst. of Physics and Technology; Inst. Semiconductor Physics

2010-07-29T23:59:59.000Z

108

Quantum breathers in capacitively coupled Josephson junctions: Correlations, number conservation, and entanglement  

E-Print Network [OSTI]

Quantum breathers in capacitively coupled Josephson junctions: Correlations, number conservation coupled Josephson junctions. In the classical case the equations of motion admit discrete breather by employing the already developed tech- niques for quantum information processing using Josephson junctions

Flach, Sergej

109

Dynamics of domain wall networks with junctions  

SciTech Connect (OSTI)

We use a combination of analytic tools and an extensive set of the largest and most accurate three-dimensional field theory numerical simulations to study the dynamics of domain wall networks with junctions. We build upon our previous work and consider a class of models which, in the limit of large number N of coupled scalar fields, approaches the so-called ''ideal'' model (in terms of its potential to lead to network frustration). We consider values of N between N=2 and N=20, and a range of cosmological epochs, and we also compare this class of models with other toy models used in the past. In all cases we find compelling evidence for a gradual approach to scaling, strongly supporting our no-frustration conjecture. We also discuss the various possible types of junctions (including cases where there is a hierarchy of them) and their roles in the dynamics of the network. Finally, we provide a cosmological Zel'dovich-type bound on the energy scale of this kind of defect network: it must be lower than 10 keV.

Avelino, P. P.; Oliveira, J. C. R. E. [Centro de Fisica do Porto, Rua do Campo Alegre 687, 4169-007 Porto (Portugal); Departamento de Fisica da Faculdade de Ciencias da Universidade do Porto, Rua do Campo Alegre 687, 4169-007 Porto (Portugal); Martins, C. J. A. P. [Centro de Astrofisica da Universidade do Porto, Rua das Estrelas s/n, 4150-762 Porto (Portugal); DAMTP, University of Cambridge, Wilberforce Road, Cambridge CB3 0WA (United Kingdom); Menezes, J. [Centro de Fisica do Porto, Rua do Campo Alegre 687, 4169-007 Porto (Portugal); Centro de Astrofisica da Universidade do Porto, Rua das Estrelas s/n, 4150-762 Porto (Portugal); Departamento de Fisica, Universidade Federal da Paraiba, Caixa Postal 5008, 58051-970 Joao Pessoa, Paraiba (Brazil); Menezes, R. [Departamento de Fisica, Universidade Federal da Paraiba, Caixa Postal 5008, 58051-970 Joao Pessoa, Paraiba (Brazil)

2008-11-15T23:59:59.000Z

110

A fourier spectrometer for studying the radiation from Josephson Junctions  

SciTech Connect (OSTI)

The paper describes a Fourier spectrometer designed to study the radiation generated by a Josephson junction in the millimeter and FIR bands with a resolution of {approx}2 GHz in the two-pass mode and {approx}1 GHz in the multipass mode. A feature is that one Josephson junctions operates as both generator and detector at the same time.

Verevkin, A.A.; Il`in, V.A.; Lipatov, A.P. [V.I. Lenin Moscow Pedagogical State Univ., Moscow (Russian Federation)

1995-06-01T23:59:59.000Z

111

Conditions for synchronization in Josephson-junction arrays  

SciTech Connect (OSTI)

An effective perturbation theoretical method has been developed to study the dynamics of Josephson Junction series arrays. It is shown that the inclusion of Junction capacitances, often ignored, has a significant impact on synchronization. Comparison of analytic with computational results over a wide range of parameters shows excellent agreement.

Chernikov, A.A.; Schmidt, G. [Stevens Institute of Technology, Hoboken, NJ (United States)

1995-12-31T23:59:59.000Z

112

Josephson junctions in high-T/sub c/ superconductors  

DOE Patents [OSTI]

The invention includes a high T/sub c/ Josephson sperconducting junction as well as the method and apparatus which provides the junction by application of a closely controlled and monitored electrical discharge to a microbridge region connecting two portions of a superconducting film.

Falco, C.M.; Lee, T.W.

1981-01-14T23:59:59.000Z

113

Intermittency and low frequency noise in a Josephson junction  

SciTech Connect (OSTI)

The bifurcation, chaos, and intermittency in the {ital f}-biased Josephson junction are investigated by numerically integrating the equation of the Stewart-McCumber model with an interference {epsilon} cos {phi}'' term. In addition, the relationship between the low frequency noise and the routes to chaos in a Josephson junction is discussed.

Xiao Wanru (Physics Division, Nanjing Architectural Institute (CN)); Yao Xixian (Department of Physics, Nanjing University (CN))

1990-01-01T23:59:59.000Z

114

Conditions for synchronization in Josephson-junction arrays  

SciTech Connect (OSTI)

An effective perturbation theoretical method has been developed to study the dynamics of Josephson-junction series arrays. It is shown that the inclusion of junction capacitances, which is often ignored, has a significant impact on synchronization. Comparison of analytic with computational results over a wide range of parameters shows excellent agreement.

Chernikov, A.A.; Schmidt, G. [Stevens Institute of Technology, Hoboken, New Jersey 07030 (United States)] [Stevens Institute of Technology, Hoboken, New Jersey 07030 (United States)

1995-10-01T23:59:59.000Z

115

Profiling the Thermoelectric Power of Semiconductor Junctions with  

E-Print Network [OSTI]

sources realize energy conversion between heat and electricity without the use of moving me- chanical the thermoelectric power, band struc- tures, and carrier concentrations of semiconductor junctions that constitute S is governed by local carrier statistics, SThEM allows us to profile precise elec- tronic junction locations

116

E-Print Network 3.0 - adhering junctions connecting Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

S... . P. Benz, and J. E. Bonevich Abstract--The authors have made tall, uniform stacked Josephson junction... bar- rier of our niobium Josephson junctions and obtain working...

117

Data Compendium for the Logging Test Pits at the ERDA Grand Junction...  

Broader source: Energy.gov (indexed) [DOE]

Data Compendium for the Logging Test Pits at the ERDA Grand Junction Compound (December 1975) Data Compendium for the Logging Test Pits at the ERDA Grand Junction Compound...

118

Quantum computing with atomic Josephson junction arrays  

SciTech Connect (OSTI)

We present a quantum computing scheme with atomic Josephson junction arrays. The system consists of a small number of atoms with three internal states and trapped in a far-off-resonant optical lattice. Raman lasers provide the 'Josephson' tunneling, and the collision interaction between atoms represent the 'capacitive' couplings between the modes. The qubit states are collective states of the atoms with opposite persistent currents. This system is closely analogous to the superconducting flux qubit. Single-qubit quantum logic gates are performed by modulating the Raman couplings, while two-qubit gates result from a tunnel coupling between neighboring wells. Readout is achieved by tuning the Raman coupling adiabatically between the Josephson regime to the Rabi regime, followed by a detection of atoms in internal electronic states. Decoherence mechanisms are studied in detail promising a high ratio between the decoherence time and the gate operation time.

Tian Lin; Zoller, P. [Institute for Theoretical Physics, University of Innsbruck, A-6020 Innsbruck (Austria)

2003-10-01T23:59:59.000Z

119

Advanced Concepts in Josephson Junction Reflection Amplifiers  

E-Print Network [OSTI]

Low-noise amplification atmicrowave frequencies has become increasingly important for the research related to superconducting qubits and nanoelectromechanical systems. The fundamental limit of added noise by a phase-preserving amplifier is the standard quantum limit, often expressed as noise temperature $T_{q} = \\hbar {\\omega}/2k_{B}$. Towards the goal of the quantum limit, we have developed an amplifier based on intrinsic negative resistance of a selectively damped Josephson junction. Here we present measurement results on previously proposed wide-band microwave amplification and discuss the challenges for improvements on the existing designs. We have also studied flux-pumped metamaterial-based parametric amplifiers, whose operating frequency can be widely tuned by external DC-flux, and demonstrate operation at $2\\omega$ pumping, in contrast to the typical metamaterial amplifiers pumped via signal lines at $\\omega$.

Pasi Lhteenmki; Visa Vesterinen; Juha Hassel; G. S. Paraoanu; Heikki Sepp; Pertti Hakonen

2014-05-20T23:59:59.000Z

120

Quantum Fluctuations in Josephson Junction Comparators  

E-Print Network [OSTI]

We have developed a method for calculation of quantum fluctuation effects, in particular of the uncertainty zone developing at the potential curvature sign inversion, for a damped harmonic oscillator with arbitrary time dependence of frequency and for arbitrary temperature, within the Caldeira-Leggett model. The method has been applied to the calculation of the gray zone width Delta Ix of Josephson-junction balanced comparators driven by a specially designed low-impedance RSFQ circuit. The calculated temperature dependence of Delta Ix in the range 1.5 to 4.2K is in a virtually perfect agreement with experimental data for Nb-trilayer comparators with critical current densities of 1.0 and 5.5 kA/cm^2, without any fitting parameters.

Thomas J. Walls; Timur V. Filippov; Konstantin K. Likharev

2002-07-15T23:59:59.000Z

Note: This page contains sample records for the topic "junction greenfield grundy" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

Quantum Computing with Atomic Josephson Junction Arrays  

E-Print Network [OSTI]

We present a quantum computing scheme with atomic Josephson junction arrays. The system consists of a small number of atoms with three internal states and trapped in a far-off resonant optical lattice. Raman lasers provide the "Josephson" tunneling, and the collision interaction between atoms represent the "capacitive" couplings between the modes. The qubit states are collective states of the atoms with opposite persistent currents. This system is closely analogous to the superconducting flux qubit. Single qubit quantum logic gates are performed by modulating the Raman couplings, while two-qubit gates result from a tunnel coupling between neighboring wells. Readout is achieved by tuning the Raman coupling adiabatically between the Josephson regime to the Rabi regime, followed by a detection of atoms in internal electronic states. Decoherence mechanisms are studied in detail promising a high ratio between the decoherence time and the gate operation time.

Lin Tian; P. Zoller

2003-06-12T23:59:59.000Z

122

The World as a Dual Josephson Junction  

E-Print Network [OSTI]

We examine some of the implications of the field-theoretical mechanism for the localization of gauge fields on hypersurfaces in higher-dimensional bulk space-time. This mechanism exploits the analogy between confinement and dual superconductivity. In the simplest case of a photon localized on a (2+1)-dimensional surface in a (3+1)-dimensional bulk, we argue that the system behaves like a dual Josephson junction. This implies that the effective gauge theory on the surface is not free, but displays weak confinement with a linear potential. We comment on the relevance of our results for the realistic case of a (3+1)-dimensional surface in a space-time with one or more extra dimensions.

N. Tetradis

2000-02-24T23:59:59.000Z

123

Gauge Theories of Josephson Junction Arrays  

E-Print Network [OSTI]

We show that the zero-temperature physics of planar Josephson junction arrays in the self-dual approximation is governed by an Abelian gauge theory with periodic mixed Chern-Simons term describing the charge-vortex coupling. The periodicity requires the existence of (Euclidean) topological excitations which determine the quantum phase structure of the model. The electric-magnetic duality leads to a quantum phase transition between a superconductor and a superinsulator at the self-dual point. We also discuss in this framework the recently proposed quantum Hall phases for charges and vortices in presence of external offset charges and magnetic fluxes: we show how the periodicity of the charge-vortex coupling can lead to transitions to anyon superconductivity phases. We finally generalize our results to three dimensions, where the relevant gauge theory is the so-called BF system, with an antisymmetric Kalb-Ramond gauge field.

M. C. Diamantini; P. Sodano; C. A. Trugenberger

1995-11-23T23:59:59.000Z

124

Structural organization of gap junction channels  

Science Journals Connector (OSTI)

Gap junctions were initially described morphologically, and identified as semi-crystalline arrays of channels linking two cells. This suggested that they may represent an amenable target for electron and X-ray crystallographic studies in much the same way that bacteriorhodopsin has. Over 30 years later, however, an atomic resolution structural solution of these unique intercellular pores is still lacking due to many challenges faced in obtaining high expression levels and purification of these structures. A variety of microscopic techniques, as well as NMR structure determination of fragments of the protein, have now provided clearer and correlated views of how these structures are assembled and function as intercellular conduits. As a complement to these structural approaches, a variety of mutagenic studies linking structure and function have now allowed molecular details to be superimposed on these lower resolution structures, so that a clearer image of pore architecture and its modes of regulation are beginning to emerge.

Gina E. Sosinsky; Bruce J. Nicholson

2005-01-01T23:59:59.000Z

125

Josephson-junction arrays with long-range interactions  

SciTech Connect (OSTI)

We calculate the current-voltage (IV) characteristics of a Josephson-junction array with long-range interactions. The array consists of two sets of equally spaced parallel superconducting wires placed at right angles. A Josephson junction is formed at every point wherever the wires cross. We treat each such junction as an overdamped resistively shunted junction, and each wire segment between two junctions as a similar resistively shunted junction with a much higher critical current. The IV characteristics are obtained by solving the coupled Josephson equations numerically. We find that, for a sufficiently large number of wires, the critical current saturates at a finite value because of the wire inductance, in excellent agreement with experiment. The calculated IV characteristics also show a striking hysteresis, even though each of the individual junctions is {ital nonhysteretic}. The hysteresis results from a global redistribution of current flow on the upper and lower voltage branches, and is also in excellent agreement with experiment. {copyright} {ital 1997} {ital The American Physical Society}

Harbaugh, J.K.; Stroud, D. [Department of Physics, Ohio State University, Columbus, Ohio 43210 (United States)] [Department of Physics, Ohio State University, Columbus, Ohio 43210 (United States)

1997-10-01T23:59:59.000Z

126

Dissipative dynamics of a Josephson junction in the Bose gases  

SciTech Connect (OSTI)

The dissipative dynamics of a Josephson junction in Bose gases is considered within the framework of the model of a tunneling Hamiltonian. The effective action that describes the dynamics of the phase difference across the junction is derived using the functional integration method. The dynamic equation obtained for the phase difference across the junction is analyzed for the finite temperatures in the low-frequency limit involving the radiation terms. The asymmetric case of the Bose gases with the different order parameters is calculated as well.

Barankov, R.A. [Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States); Burmistrov, S.N. [RRC 'Kurchatov Institute', Kurchatov Sq.1, 123182 Moscow (Russian Federation)

2003-01-01T23:59:59.000Z

127

Junction Temperature Measurement of IGBTs Using Short Circuit Current  

SciTech Connect (OSTI)

In this paper, a method is proposed to measure the junction temperatures of IGBT discrete devices and modules using short circuit current. Experimental results show that the short circuit current has good sensitivity, linearity and selectivity, which is suitable to be used as temperature sensitive electrical parameters (TSEP). Test circuit and hardware design are proposed for junction temperature measurement in single phase and three phase convertes. By connecting a temperature measurement unit to the converter and giving a short circuit pulse, the IGBT junction temperature can be measured.

Wang, Fei [ORNL; Xu, Zhuxian [ORNL; Ning, Puqi [ORNL

2012-01-01T23:59:59.000Z

128

BPS domain wall junctions in infinitely large extra dimensions  

Science Journals Connector (OSTI)

We consider models of scalar fields coupled to gravity which are higher-dimensional generalizations of four dimensional supergravity. We use these models to describe domain wall junctions in an antide Sitter background. We derive Bogomolnyi equations for the scalar fields from which the walls are constructed and for the metric. From these equations a BPS-like formula for the junction energy can be derived. We demonstrate that such junctions localize gravity in the presence of more than one uncompactified extra dimension.

Sean M. Carroll; Simeon Hellerman; Mark Trodden

2000-07-27T23:59:59.000Z

129

Microwave Photon Counter Based on Josephson Junctions Y.-F. Chen,1,* D. Hover,1  

E-Print Network [OSTI]

Microwave Photon Counter Based on Josephson Junctions Y.-F. Chen,1,* D. Hover,1 S. Sendelbach,1 L on the current-biased Josephson junction. The junction is tuned to absorb single microwave photons from optical photon counters, it is natural to consider the Josephson junction--a nonlinear, nondissipative

Saffman, Mark

130

Supercurrent-Induced Temperature Gradient across a Nonequilibrium SNS Josephson Junction M. S. Crosser,1  

E-Print Network [OSTI]

Supercurrent-Induced Temperature Gradient across a Nonequilibrium SNS Josephson Junction M. S direction. The feature represents an effective temperature gradient across the SNS Josephson junction Josephson junction (SNS JJ) into a `` junction'' by driving the electron energy distribution far from

Birge, Norman

131

Asymmetric noise probed with a Josephson junction Q. Le Masne,1  

E-Print Network [OSTI]

Asymmetric noise probed with a Josephson junction Q. Le Masne,1 H. Pothier,1, Norman O. Birge,2 C are measured using a Josephson junction. The current noise adds to the bias current of the Josephson junction], consists in using a Josephson junction (JJ) as a large bandwidth on-chip noise detector [7, 8, 9]. It has

Boyer, Edmond

132

Cooper pair transport and Coulomb blockade in one dimensional Josephson junction arrays  

E-Print Network [OSTI]

Cooper pair transport and Coulomb blockade in one dimensional Josephson junction arrays Peter š?ogskoletryckeriet, Stockholm, 2000 #12; Abstract One dimensional Josephson junction arrays have been fabricated, measured small capacitance Josephson junction is described using a Serial Resistive and Inductive Junction (SRLJ

Haviland, David

133

Asymmetric Noise Probed with a Josephson Junction Q. Le Masne,1  

E-Print Network [OSTI]

Asymmetric Noise Probed with a Josephson Junction Q. Le Masne,1 H. Pothier,1,* Norman O. Birge,2 C of the current through a tunnel junction are measured using a Josephson junction. The current noise adds to the bias current of the Josephson junction and affects its switching out of the supercurrent branch

Birge, Norman

134

EA-0930: Facility Operations at the U.S. DOE Grand Junction Projects  

Broader source: Energy.gov (indexed) [DOE]

30: Facility Operations at the U.S. DOE Grand Junction 30: Facility Operations at the U.S. DOE Grand Junction Projects Office, Grand Junction, Colorado EA-0930: Facility Operations at the U.S. DOE Grand Junction Projects Office, Grand Junction, Colorado SUMMARY This EA evaluates the environmental impacts of the proposal to expand and upgrade the U.S. Department of Energy's Grand Junction Projects Office facilities and operations in Grand Junction, Colorado. PUBLIC COMMENT OPPORTUNITIES None available at this time. DOCUMENTS AVAILABLE FOR DOWNLOAD June 8, 1996 EA-0930: Finding of No Significant Impact Facility Operations at the U.S. DOE Grand Junction Projects Office, Grand Junction, Colorado June 8, 1996 EA-0930: Final Environmental Assessment Facility Operations at the U.S. DOE Grand Junction Projects Office, Grand

135

EA-1037: Uranium Lease Management Program, Grand Junction, Colorado |  

Broader source: Energy.gov (indexed) [DOE]

37: Uranium Lease Management Program, Grand Junction, Colorado 37: Uranium Lease Management Program, Grand Junction, Colorado EA-1037: Uranium Lease Management Program, Grand Junction, Colorado SUMMARY This EA evaluates the environmental impacts of the U.S. Department of Energy's Grand Junction Projects Office's proposal to maintain and preserve the nation's immediately accessible supply of domestic uranium and vanadium ores, to maintain a viable domestic mining and milling infrastructure required to produce and mill these ores, and to provide assurance of a fair monetary return to the U.S. Government. The Uranium Lease Management Program gives The Department of Energy the flexibility to continue leasing these lands. PUBLIC COMMENT OPPORTUNITIES None available at this time. DOCUMENTS AVAILABLE FOR DOWNLOAD August 22, 1995

136

Manipulating Josephson junctions in thin-films by nearby vortices  

SciTech Connect (OSTI)

It is shown that a vortex trapped in one of the banks of a planar edge-type Josephson junction in a narrow thin-film superconducting strip can change drastically the dependence of the junction critical current on the applied field, I-c(H). When the vortex is placed at certain discrete positions in the strip middle, the pattern I-c(H) has zero at H = 0 instead of the traditional maximum of '0-type' junctions. The number of these positions is equal to the number of vortices trapped at the same location. When the junction-vortex separation exceeds similar to W, the strip width, I-c(H) is no longer sensitive to the vortex presence. The same is true for any separation if the vortex approaches the strip edges. (C) 2014 Elsevier B.V. All rights reserved.

Kogan, V.G.; Mints, R.G.

2014-07-01T23:59:59.000Z

137

Power dissipation in a single molecule junction: Tracking energy levels  

E-Print Network [OSTI]

Motivated by recent work [Lee et al. Nature {\\bf 489}, 209 (2013)], on asymmetry features of heat dissipation in the electrodes of molecular junctions, we put forward an idea as a result of heat dissipation in the electrodes. Based on tight-binding model and a generalized Green's function formalism, we describe the conditions under which heat dissipation shows symmetry characteristic and does not depend on the bias polarity. We also show the power dissipated in the junction can be used to detect which energy levels of molecule junction play more or less role in the transmission process. We present this idea by studying a simple toy model and Au-$C_{60}$-Au junction.

Yaghoob Naimi; Javad Vahedi

2014-12-05T23:59:59.000Z

138

Heterojunction for Multi-Junction Solar Cells - Energy Innovation...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

for use in forming a photodetector that has applications for use in a multi-junction solar cell and detecting light at an energy greater than 0.95-1.2 eV. DescriptionThis...

139

From Josephson junction metamaterials to tunable pseudo-cavities  

E-Print Network [OSTI]

The scattering through a Josephson junction interrupting a superconducting line is revisited including power leakage. We discuss also how to make tunable and broadband resonant mirrors by concatenating junctions. As an application, we show how to construct cavities using these mirrors, thus connecting two research fields: JJ quantum metamaterials and coupled cavity arrays. We finish by discussing the first non-linear corrections to the scattering and their measurable effects.

D. Zueco; C. Fernndez-Juez; J. Yago; U. Naether; B. Peropadre; J. J. Garca-Ripoll; J. J. Mazo

2013-05-21T23:59:59.000Z

140

High-frequency wave sources using Josephson-junction arrays  

SciTech Connect (OSTI)

Results from Josephson-junction arrays used as high-frequency wave sources are presented. Phase-locked Josephson-junction arrays having a large number of junctions were developed to meet the need for compact submillimeter-wave sources for use in such applications as satellite communications are receivers for radioastronomical observations. The design, fabrication processes, and measurement are discussed. Distributed arrays of 40 junctions in which all Josephson junctions are placed at wavelength intervals were fabricated and tested. Such arrays can deliver about 1 [mu]W of power into a 20-60 [Omega] load resistor in the frequency ranger from 100 to 500 GHz, the upper limit being set by the large loss of the superconducting microstrip. Compact arrays were designed and fabricated to eliminate the loss of the superconducting microstrip. Those arrays have also demonstrated an output power level about 1 [mu]W into a 15 [Omega] load from 100 GHz up to 620 GHz. Characteristics of the Josephson junction source, including the power level, impedance matching, the tunability, the radiation linewidth, and tuning rate (or frequency-modulation) are discussed.

Wan, Kelin.

1991-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "junction greenfield grundy" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Microstructure of Josephson junctions: Effect on supercurrent transport in YBCO grain boundary and barrier layer junctions  

SciTech Connect (OSTI)

The electric transport of high-temperature superconductors, such as YBa{sub 2}Cu{sub 3}O{sub 7{minus}x} (YBCO), can be strongly restricted by the presence of high-angle grain boundaries (GB). This weak-link behavior is governed by the macroscopic GB geometry and the microscopic grain boundary structure and composition at the atomic level. Whereas grain boundaries present a considerable impediment to high current applications of high T{sub c} materials, there is considerable commercial interest in exploiting the weak-link-nature of grain boundaries for the design of microelectronic devices, such as superconducting quantum interference devices (SQUIDs). The Josephson junctions which form the basis of this technology can also be formed by introducing artificial barriers into the superconductor. The authors have examined both types of Josephson junctions by EM techniques in an effort to understand the connection between microstructure/chemistry and electrical transport properties. This knowledge is a valuable resource for the design and production of improved devices.

Merkle, K.L.; Huang, Y.

1998-01-01T23:59:59.000Z

142

Elongated nanostructures for radial junction solar cells  

Science Journals Connector (OSTI)

In solar cell technology, the current trend is to thin down the active absorber layer. The main advantage of a thinner absorber is primarily the reduced consumption of material and energy during production. For thin film silicon (Si) technology, thinning down the absorber layer is of particular interest since both the device throughput of vacuum deposition systems and the stability of the devices are significantly enhanced. These features lead to lower cost per installed watt peak for solar cells, provided that the (stabilized) efficiency is the same as for thicker devices. However, merely thinning down inevitably leads to a reduced light absorption. Therefore, advanced light trapping schemes are crucial to increase the light path length. The use of elongated nanostructures is a promising method for advanced light trapping. The enhanced optical performance originates from orthogonalization of the light's travel path with respect to the direction of carrier collection due to the radial junction, an improved anti-reflection effect thanks to the three-dimensional geometric configuration and the multiple scattering between individual nanostructures. These advantages potentially allow for high efficiency at a significantly reduced quantity and even at a reduced material quality, of the semiconductor material. In this article, several types of elongated nanostructures with the high potential to improve the device performance are reviewed. First, we briefly introduce the conventional solar cells with emphasis on thin film technology, following the most commonly used fabrication techniques for creating nanostructures with a high aspect ratio. Subsequently, several representative applications of elongated nanostructures, such as Si nanowires in realistic photovoltaic (PV) devices, are reviewed. Finally, the scientific challenges and an outlook for nanostructured PV devices are presented.

Yinghuan Kuang; Marcel Di Vece; Jatindra K Rath; Lourens van Dijk; Ruud E I Schropp

2013-01-01T23:59:59.000Z

143

Grundy County, Illinois: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

00531°, -88.4016041° 00531°, -88.4016041° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":41.3500531,"lon":-88.4016041,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

144

Grundy County, Iowa: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

°, -92.8577105° °, -92.8577105° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":42.4369506,"lon":-92.8577105,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

145

Grundy County, Tennessee: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

°, -85.684578° °, -85.684578° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":35.4013452,"lon":-85.684578,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

146

Grundy County, Missouri: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

°, -93.5003454° °, -93.5003454° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":40.1743786,"lon":-93.5003454,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

147

Measure Guideline: Optimizing the Configuration of Flexible Duct Junction Boxes  

SciTech Connect (OSTI)

This measure guideline offers additional recommendations to heating, ventilation, and air conditioning (HVAC) system designers for optimizing flexible duct, constant-volume HVAC systems using junction boxes within Air Conditioning Contractors of America (ACCA) Manual D guidance (Rutkowski, H. Manual D -- Residential Duct Systems, 3rd edition, Version 1.00. Arlington, VA: Air Conditioning Contractors of America, 2009.). IBACOS used computational fluid dynamics software to explore and develop guidance to better control the airflow effects of factors that may impact pressure losses within junction boxes among various design configurations (Beach, R., Prahl, D., and Lange, R. CFD Analysis of Flexible Duct Junction Box Design. Golden, CO: National Renewable Energy Laboratory, submitted for publication 2013). These recommendations can help to ensure that a system aligns more closely with the design and the occupants' comfort expectations. Specifically, the recommendations described herein show how to configure a rectangular box with four outlets, a triangular box with three outlets, metal wyes with two outlets, and multiple configurations for more than four outlets. Designers of HVAC systems, contractors who are fabricating junction boxes on site, and anyone using the ACCA Manual D process for sizing duct runs will find this measure guideline invaluable for more accurately minimizing pressure losses when using junction boxes with flexible ducts.

Beach, R.; Burdick, A.

2014-03-01T23:59:59.000Z

148

Microwave coupling of frequency-locked Josephson junction arrays  

SciTech Connect (OSTI)

A high temperature superconducting YBa{sub 2}Cu{sub 3}O{sub y} array of five Josephson junctions designed with additional coupling lines has been developed to demonstrate the effects of frequency locking and impedance matching for applications such as oscillators, mixers, and detectors. The Josephson self-radiation power was directly detected by a superheterodyne receiver, and Shapiro steps were also measured. The Josephson self-radiation properties reveal good quality of phase locking and microwave coupling with external circuits. The maximum self-radiation power of our array is about 50 pW which is several ten times higher than that of a single Josephson junction, and its peak point exactly satisfies the Josephson current-voltage relation. The Shapiro-step measurements show that the behavior of current-voltage curve depends on the effective inductance of coupling lines which affects the total impedance of Josephson junction array and microwave coupling. The Josephson oscillation frequency was obtained up to about 880 GHz which is 73{percent} of the maximum available frequency calculated from the characteristic voltage of the Josephson junctions. Experimental results show that this type of Josephson junction array can improve the Josephson self-radiation power and increase the maximum detectable frequency. {copyright} {ital 1997 American Institute of Physics.}

Song, I.; Eom, Y.; Park, G. [Department of Physics, Sogang University, Seoul 100-611 (Korea)] [Department of Physics, Sogang University, Seoul 100-611 (Korea); Lee, E.; Park, S. [Electronic Materials Laboratory, Samsung Advanced Institute of Technology, Suwon (Korea)] [Electronic Materials Laboratory, Samsung Advanced Institute of Technology, Suwon (Korea)

1997-06-01T23:59:59.000Z

149

Theoretical exploration of Josephson Plasma Emission in Intrinsic Josephson Junctions  

SciTech Connect (OSTI)

In this paper, the authors theoretically predict the best efficient way for electromagnetic wave emission by Josephson plasma excitation in intrinsic Josephson junctions. First, they briefly derive basic equations describing dynamics of phase differences inside junction sites in intrinsic Josephson junctions, and review the nature of Josephson plasma excitation modes based on the equations. Especially, they make an attention to that Josephson plasma modes have much different dispersion relations depending on the propagating directions and their different modes can be recognized as N standing waves propagating along ah-plane in cases of finite stacked systems composed of N junctions. Second, they consider how to excite their modes and point out that excitations of in-phase mode with the highest propagation velocity among their N modes are the most efficient way for electromagnetic wave emissions. Finally, they clarify that in-phase excitations over all junctions are possible by using Josephson vortex flow states. They show simulation results of Josephson vortex flow states resonating with some Josephson plasma modes and predict that superradiance of electromagnetic field may occur in rectangular vortex flow state in which spatiotemporal oscillations of electromagnetic fields are perfectly in-phase.

Tachiki, M.; Machida, M.

2000-07-18T23:59:59.000Z

150

Interference effects in isolated Josephson junction arrays with geometric symmetries  

E-Print Network [OSTI]

As the size of a Josephson junction is reduced, charging effects become important and the superconducting phase across the link turns into a periodic quantum variable. Isolated Josephson junction arrays are described in terms of such periodic quantum variables and thus exhibit pronounced quantum interference effects arising from paths with different winding numbers (Aharonov-Casher effects). These interference effects have strong implications for the excitation spectrum of the array which are relevant in applications of superconducting junction arrays for quantum computing. The interference effects are most pronounced in arrays composed of identical junctions and possessing geometric symmetries; they may be controlled by either external gate potentials or by adding/removing charge to/from the array. Here we consider a loop of N identical junctions encircling one half superconducting quantum of magnetic flux. In this system, the ground state is found to be non-degenerate if the total number of Cooper pairs on the array is divisible by N, and doubly degenerate otherwise (after the stray charges are compensated by the gate voltages).

D. A. Ivanov; L. B. Ioffe; V. B. Geshkenbein; G. Blatter

2001-02-13T23:59:59.000Z

151

Breathers in Josephson junction ladders: Resonances and electromagnetic wave spectroscopy A. E. Miroshnichenko, S. Flach, and M. V. Fistul  

E-Print Network [OSTI]

Breathers in Josephson junction ladders: Resonances and electromagnetic wave spectroscopy A. E localized states discrete breathers and linear electromagnetic excitations EE's in Josephson junction lattices 6 , and localized resistive states in Josephson junction arrays 7­10 . The latter systems

Flach, Sergej

152

City of Grand Junction, Iowa (Utility Company) | Open Energy Information  

Open Energy Info (EERE)

Grand Junction City of Grand Junction City of Place Iowa Utility Id 7486 Utility Location Yes Ownership M NERC Location MRO NERC MRO Yes Operates Generating Plant Yes Activity Distribution Yes References EIA Form EIA-861 Final Data File for 2010 - File1_a[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Utility Rate Schedules Grid-background.png Commercial Electric Commercial Demand Service Commercial Residential Eletric Residential Average Rates Residential: $0.1340/kWh Commercial: $0.1300/kWh Industrial: $0.0899/kWh References ↑ "EIA Form EIA-861 Final Data File for 2010 - File1_a" Retrieved from "http://en.openei.org/w/index.php?title=City_of_Grand_Junction,_Iowa_(Utility_Company)&oldid=409673

153

NREL: Awards and Honors - Triple-Junction Terrestrial Concentrator Solar  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Triple-Junction Terrestrial Concentrator Solar Cell Triple-Junction Terrestrial Concentrator Solar Cell Developers: Dr. Jerry Olson, Dr. Sarah Kurtz, Dr. Daniel Friedman, Alan Kibbler, and Charlene Karmer, National Renewable Energy Laboratory; Dr. Richard King, Jim Ermer, Dmitri D. Krut, Hector Cotal, Peter Colter, Hojun Yoon, Nassar Karam, and Gregory S. Glenn, Spectrolab, Inc. The triple-junction solar cell - or TJ solar cell - generates a lot of energy from just a very little amount of material. How much energy? A 1-cm2 cell can generate as much as 35 W of power and produce as much as 86.3 kWh of electricity during a typical year under a Phoenix, AZ sun. This means that 100 to 150 of these cells could produce enough electricity to power the typical American household. This cell can do this, first, because it

154

Bloch Inductance in Small-Capacitance Josephson Junctions  

SciTech Connect (OSTI)

We show that the electrical impedance of a small-capacitance Josephson junction also includes, in addition to the capacitive term -i/{omega}C{sub B}, an inductive term i{omega}L{sub B}. Similar to the known Bloch capacitance C{sub B}(q), the Bloch inductance L{sub B}(q) also depends periodically on the quasicharge, q, and its maximum value achieved at q=e(mod 2e) always exceeds the value of the Josephson inductance of this junction L{sub J}({phi}) at fixed {phi}=0. The effect of the Bloch inductance on the dynamics of a single junction and a one-dimensional array is described.

Zorin, A.B. [Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig (Germany)

2006-04-28T23:59:59.000Z

155

Physical understanding of cryogenic implant benefits for electrical junction stability  

SciTech Connect (OSTI)

We investigate the effect of cryogenic temperature implants on electrical junction stability for ultra shallow junction applications for sub-32 nm technology nodes and beyond. A comprehensive study was conducted to gain physical understanding of the impact of cryogenic temperature implants on dopant-defect interactions. Carborane (C{sub 2}B{sub 10}H{sub 12}) molecule, a potential alternative to monomer boron was implanted in carbon preamorphized silicon substrates at cryogenic implant temperatures. Results indicate implants at cryogenic temperatures increase dopant activation with reduced diffusion, resulting in lower sheet resistance for a lower junction depth. Further, this study emphasizes the benefits of co-implants performed at cryogenic temperatures as alternative to traditional preamorphizing implants.

Adeni Khaja, Fareen; Colombeau, Benjamin; Thanigaivelan, Thirumal; Ramappa, Deepak; Henry, Todd [Applied Materials-Varian Semiconductor Equipment, 35 Dory Road, Gloucester, Massachusetts 01930 (United States)

2012-03-12T23:59:59.000Z

156

Escape Time of Josephson Junctions for Signal Detection  

E-Print Network [OSTI]

In this Chapter we investigate with the methods of signal detection the response of a Josephson junction to a perturbation to decide if the perturbation contains a coherent oscillation embedded in the background noise. When a Josephson Junction is irradiated by an external noisy source, it eventually leaves the static state and reaches a steady voltage state. The appearance of a voltage step allows to measure the time spent in the metastable state before the transition to the running state, thus defining an escape time. The distribution of the escape times depends upon the characteristics of the noise and the Josephson junction. Moreover, the properties of the distribution depends on the features of the signal (amplitude, frequency and phase), which can be therefore inferred through the appropriate signal processing methods. Signal detection with JJ is interesting for practical purposes, inasmuch as the superconductive elements can be (in principle) cooled to the absolute zero and therefore can add (in practi...

Addesso, P; Pierro, V

2014-01-01T23:59:59.000Z

157

Comparison of measurements and simulations of series-parallel incommensurate area SQUID arrays fabricated from Y Ba Cu O ion damage Josephson junctions  

E-Print Network [OSTI]

3 O 7?? ion damage Josephson junctions Shane A. Cybart, 1,2 Cu 3 O 7?? thin ?lm ion damage Josephson junctions. Theconsisted of a grid of Josephson junctions with 28 junctions

Cybart, Shane A.

2014-01-01T23:59:59.000Z

158

Exact Quantum Dynamics of a Bosonic Josephson Junction  

SciTech Connect (OSTI)

The quantum dynamics of a one-dimensional bosonic Josephson junction is studied by solving the time-dependent many-boson Schroedinger equation numerically exactly. Already for weak interparticle interactions and on short time scales, the commonly employed mean-field and many-body methods are found to deviate substantially from the exact dynamics. The system exhibits rich many-body dynamics such as enhanced tunneling and a novel equilibration phenomenon of the junction depending on the interaction, which is attributed to a quick loss of coherence.

Sakmann, Kaspar; Streltsov, Alexej I.; Alon, Ofir E.; Cederbaum, Lorenz S. [Theoretische Chemie, Physikalisch-Chemisches Institut, Universitaet Heidelberg, Im Neuenheimer Feld 229, D-69120 Heidelberg (Germany)

2009-11-27T23:59:59.000Z

159

Exact quantum dynamics of a bosonic Josephson junction  

E-Print Network [OSTI]

The quantum dynamics of a one-dimensional bosonic Josephson junction is studied by solving the time-dependent many-boson Schr\\"odinger equation numerically exactly. Already for weak interparticle interactions and on short time scales, the commonly-employed mean-field and many-body methods are found to deviate substantially from the exact dynamics. The system exhibits rich many-body dynamics like enhanced tunneling and a novel equilibration phenomenon of the junction depending on the interaction, attributed to a quick loss of coherence.

Kaspar Sakmann; Alexej I. Streltsov; Ofir E. Alon; Lorenz S. Cederbaum

2009-05-06T23:59:59.000Z

160

Observation of negative absolute resistance in a Josephson junction  

E-Print Network [OSTI]

We experimentally demonstrate the occurrence of negative absolute resistance (NAR) up to about $-1\\Omega$ in response to an externally applied dc current for a shunted Nb-Al/AlO$_x$-Nb Josephson junction, exposed to a microwave current at frequencies in the GHz range. The realization (or not) of NAR depends crucially on the amplitude of the applied microwave current. Theoretically, the system is described by means of the resistively and capacitively shunted junction model in terms of a moderately damped, classical Brownian particle dynamics in a one-dimensional potential. We find excellent agreement of the experimental results with numerical simulations of the model.

J. Nagel; D. Speer; T. Gaber; A. Sterck; R. Eichhorn; P. Reimann; K. Ilin; M. Siegel; D. Koelle; R. Kleiner

2008-01-28T23:59:59.000Z

Note: This page contains sample records for the topic "junction greenfield grundy" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

Testing axion physics in a Josephson junction environment  

E-Print Network [OSTI]

We suggest that experiments based on Josephson junctions, SQUIDS, and coupled Josephson qubits can be used to construct a resonant environment for dark matter axions. We propose experimental setups in which axionic interaction strengths in a Josephson junction environment can be tested, similar in nature to recent experiments that test for quantum entanglement of two coupled Josephson qubits. We point out that the parameter values relevant for early-universe axion cosmology are accessible with present day's achievements in nanotechnology. We work out how typical dark matter and dark energy signals would look like in a novel detector that exploits this effect.

Beck, Christian

2011-01-01T23:59:59.000Z

162

Averaged equations for Josephson junction series arrays with LRC load  

E-Print Network [OSTI]

We derive the averaged equations describing a series array of Josephson junctions shunted by a parallel inductor-resistor-capacitor load. We assume that the junctions have negligable capacitance ($\\beta = 0$), and derive averaged equations which turn out to be completely tractable: in particular the stability of both in-phase and splay states depends on a single parameter, $\\del$. We find an explicit expression for $\\delta$ in terms of the load parameters and the bias current. We recover (and refine) a common claim found in the technical literature, that the in-phase state is stable for inductive loads and unstable for capacitive loads.

Kurt Wiesenfeld; James W. Swift

1994-08-26T23:59:59.000Z

163

Testing axion physics in a Josephson junction environment  

E-Print Network [OSTI]

We suggest that experiments based on Josephson junctions, SQUIDS, and coupled Josephson qubits can be used to construct a resonant environment for dark matter axions. We propose experimental setups in which axionic interaction strengths in a Josephson junction environment can be tested, similar in nature to recent experiments that test for quantum entanglement of two coupled Josephson qubits. We point out that the parameter values relevant for early-universe axion cosmology are accessible with present day's achievements in nanotechnology. We work out how typical dark matter and dark energy signals would look like in a novel detector that exploits this effect.

Christian Beck

2011-11-17T23:59:59.000Z

164

Three-dimensional Josephson-junction arrays: Static magnetic response  

SciTech Connect (OSTI)

In this work we present a simple three-dimensional Josephson-junction array model: a cube with twelve junctions, one on each edge. The low-field magnetic response of the system is studied numerically for arbitrary directions of the applied field. In this model the magnetic energy of the circulating currents is taken into account by introducing an effective mutual inductance matrix. The lower threshold field for flux penetration is determined in a closed analytic form for field directions perpendicular to one cube side. {copyright} {ital 1998} {ital The American Physical Society}

De Luca, R.; Di Matteo, T. [INFM-Dipartimento di Fisica, Universita degli Studi di Salerno, I-84081 Baronissi (Salerno) (Italy)] [INFM-Dipartimento di Fisica, Universita degli Studi di Salerno, I-84081 Baronissi (Salerno) (Italy); Tuohimaa, A.; Paasi, J. [Laboratory of Electricity and Magnetism, Tampere University of Technology, FIN-33101 Tampere (Finland)] [Laboratory of Electricity and Magnetism, Tampere University of Technology, FIN-33101 Tampere (Finland)

1998-01-01T23:59:59.000Z

165

Peltier cooling stage utilizing a superconductor-semiconductor junction  

SciTech Connect (OSTI)

This paper describes a Peltier cooling stack. It comprises: a first electrode; a superconducting layer electrically coupled to the first electrode; a semiconducting layer electrically coupled to the superconducting layer; and a second superconducting layer electrically coupled to the semiconductor layer; and a second electrode electrically coupled to the second superconducting layer, electrons flowing under an applied voltage from the first electrode through the first superconducting layer, semiconductor layer, second superconducting layer and second electrode, the electrical junction between the first superconducting layer and semiconductor providing Peltier cooling while the electrical junction between the semiconductor layer and the second superconducting layer providing Peltier heating, whereby a cryogenic Peltier cooling stack is provided.

Skertic, M.M.

1991-04-09T23:59:59.000Z

166

EA-1338: Transfer of the Department of Energy Grand Junction Office to  

Broader source: Energy.gov (indexed) [DOE]

8: Transfer of the Department of Energy Grand Junction Office 8: Transfer of the Department of Energy Grand Junction Office to Non-DOE Ownership, Grand Junction, Colorado EA-1338: Transfer of the Department of Energy Grand Junction Office to Non-DOE Ownership, Grand Junction, Colorado SUMMARY This EA evaluates the environmental impacts for the proposed transfer of real and personal property at the U.S. Department of Energy's Grand Junction Office to non-DOE ownership. PUBLIC COMMENT OPPORTUNITIES None available at this time. DOCUMENTS AVAILABLE FOR DOWNLOAD April 25, 2000 EA-1338: Finding of No Significant Impact Transfer of the Department of Energy Grand Junction Office to Non-DOE Ownership April 25, 2000 EA-1338: Final Environmental Assessment Transfer of the Department of Energy Grand Junction Office to Non-DOE Ownership

167

Annexin A2 is Required for Endothelial Cell Junctional Response to S1P  

E-Print Network [OSTI]

Endothelial cell (EC) junctions are critical for angiogenesis, the sprouting and growth of new blood vessels from existing vessels. Sphingosine 1-phosphate (S1P) is a proangiogenic factor that potently stimulates sprouting, fortifies EC junctions...

Smith, Rebecca

2014-01-14T23:59:59.000Z

168

Interaction of Josephson Junction and Distant Vortex in Narrow Thin-Film Superconducting Strips  

SciTech Connect (OSTI)

The phase difference between the banks of an edge-type planar Josephson junction crossing the narrow thin-film strip depends on wether or not vortices are present in the junction banks. For a vortex close to the junction this effect has been seen by Golod, Rydh, and Krasnov [Phys. Rev. Lett. 104, 227003 (2010)], who showed that the vortex may turn the junction into ? type. It is shown here that even if the vortex is far away from the junction, it still changes the 0 junction to a ? junction when situated close to the strip edges. Within the approximation used, the effect is independent of the vortex-junction separation, a manifestation of the topology of the vortex phase which extends to macroscopic distances of superconducting coherence.

Kogan, V. G. [Ames Laboratory; Mints, R. G. [Tel Aviv University

2014-01-31T23:59:59.000Z

169

E-Print Network 3.0 - alter tight junction Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

if the read-out junction is in the underdamped phase... cheerful atmosphere in the Josephson junctions ii tel-00586075,version1-14Apr2011 12;iii group and thank......

170

E-Print Network 3.0 - altered tight junction Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

if the read-out junction is in the underdamped phase... cheerful atmosphere in the Josephson junctions ii tel-00586075,version1-14Apr2011 12;iii group and thank......

171

Low-Resolution Reconstruction of a Synthetic DNA Holliday Junction Marcelo Nollmann,*y  

E-Print Network [OSTI]

Low-Resolution Reconstruction of a Synthetic DNA Holliday Junction Marcelo No¨llmann,*y W. Marshall

Nollmann, Marcelo

172

Optimized Triple-Junction Solar Cells Using Inverted Metamorphic Approach (Presentation)  

SciTech Connect (OSTI)

Record efficiencies with triple-junction inverted metamorphic designs, modeling useful to optimize, and consider operating conditions before choosing design.

Geisz, J. F.

2008-11-01T23:59:59.000Z

173

Novel InGaAsN pn Junction for High-Efficiency Multiple-Junction Solar Cells  

SciTech Connect (OSTI)

We report the application of a novel material, InGaAsN, with bandgap energy of 1.05 eV as a junction in an InGaP/GaAs/InGaAsN/Ge 4-junction design. Results of the growth and structural, optical, and electrical properties were demonstrated, showing the promising perspective of this material for ultra high efficiency solar cells. Photovoltaic properties of an as-grown pn diode structure and improvement through post growth annealing were also discussed.

Allerman, A.A.; Chang, P.C.; Gee, J.M.; Hammons, B.E.; Hou, H.Q.; Jones, E.D.; Kurtz, S.R.; Reinhardt, K.C.

1999-03-26T23:59:59.000Z

174

Quantum Monte Carlo study of a disordered 2D Josephson junction array  

E-Print Network [OSTI]

Quantum Monte Carlo study of a disordered 2D Josephson junction array W.A. Al-Saidi *, D. Stroud reserved. PACS: 74.25.Dw; 05.30.Jp; 85.25.Cp Keywords: Josephson junctions; Quantum Monte Carlo; Disorder 1. Introduction A Josephson junction array (JJA) consists of a collection of superconducting islands connected

Stroud, David

175

The chaotic oscillations of a Josephson junction with external magnetic field  

SciTech Connect (OSTI)

Using the Melnikov Method the oscillation of a single Josephson junction with external magnetic field and DC bias is analyzed. Under the external magnetic field the junction can operate in chaos even if there is no bias. The numerical results show that in dependence on some parameters the Josephson junction with external magnetic field will go from stable periodic states to chaotic states.

Ma, J.G.; Wolff, I. [Duisburg Univ. (Germany). Dept. of Electrical Engineering

1996-05-01T23:59:59.000Z

176

Washing out of the 0-transition in Josephson junctions R. Avriller1  

E-Print Network [OSTI]

Washing out of the 0- transition in Josephson junctions R. Avriller1 and F. Pistolesi1 1 Univ: July 21, 2014) We consider a Josephson junction formed by a quantum dot connected to two bulk numbers: 73.23.-b, 74.25.F-, 74.50.+r, 74.45.+c Introduction.-- The Josephson junction is a fun- damental

Boyer, Edmond

177

Fluxon Dynamics and Radiation Emission in Twofold Long Josephson Junction Stacks  

E-Print Network [OSTI]

Fluxon Dynamics and Radiation Emission in Twofold Long Josephson Junction Stacks Andreas Wallraff¨ulich (KFA) January 27, 1997 #12;#12; Contents Introduction 1 1 Basic properties of Josephson junctions 5 2 Electrodynamics in long Josephson junctions 11 3 Radiation emission by stacked flux­flow oscillators 29 1

Leonardo, Degiorgi

178

Collapse of superconductivity in a hybrid tin-graphene Josephson junction array  

E-Print Network [OSTI]

1 Collapse of superconductivity in a hybrid tin-graphene Josephson junction array Zheng Han1 of the Josephson junction array into a zero-temperature metallic state. The suppression of proximity, models involving specific types of Josephson junction arrays in which superconducting disks are coupled

Boyer, Edmond

179

Resonant plasmon scattering by discrete breathers in Josephson junction ladders A. E. Miroshnichenko,1  

E-Print Network [OSTI]

Resonant plasmon scattering by discrete breathers in Josephson junction ladders A. E scattering by discrete breathers in Josephson junction ladders. DOI: 10.1103/PhysRevB.71.174306 PACS number Josephson junction systems,2 coupled nonlinear optical waveguides,3 lattice vi- brations in crystals,4

Flach, Sergej

180

Andreev-level spectroscopy and Josephson-current switching in a three-terminal Josephson junction  

E-Print Network [OSTI]

Andreev-level spectroscopy and Josephson-current switching in a three-terminal Josephson junction H held in thermodynamic equilibrium with the two superconducting contacts of a Josephson junction. When levels. The additional normal-metal probe coupled to the Josephson junction, shown in Fig. 1, models

Demir, Hilmi Volkan

Note: This page contains sample records for the topic "junction greenfield grundy" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

Resonant plasmon scattering by discrete breathers in Josephson junction ladders A. E. Miroshnichenko,1  

E-Print Network [OSTI]

Resonant plasmon scattering by discrete breathers in Josephson junction ladders A. E in Josephson junction ladders. We predict the existence of Fano resonances, and find them by computing in the plasmon scattering by discrete breathers in Josephson junction ladders. DOI: 10.1103/PhysRevB.71

182

Pinned fluxons in a Josephson junction with a finite-length inhomogeneity  

E-Print Network [OSTI]

Pinned fluxons in a Josephson junction with a finite-length inhomogeneity Gianne Derks , Arjen Doelman Christopher J.K. Knight§ , Hadi Susanto¶ July 5, 2011 Abstract We consider a Josephson junction as limits of our results on microresonators. Keywords: Josephson junction, inhomogeneous sine

Wirosoetisno, Djoko

183

Magnetic field penetration in a long Josephson junction imbedded in a wide stripline  

E-Print Network [OSTI]

Magnetic field penetration in a long Josephson junction imbedded in a wide stripline Andreas Franz The dependence of the first critical field of long linear and annular Josephson junctions on the width A Josephson junction is formed by two superconductors separated by a thin oxide layer allowing the tunneling

Wallraff, Andreas

184

Quantum Coherence in a Superfluid Josephson Junction Supradeep Narayana and Yuki Sato  

E-Print Network [OSTI]

Quantum Coherence in a Superfluid Josephson Junction Supradeep Narayana and Yuki Sato The Rowland in which we take an array of nanoscale apertures that form a superfluid 4He Josephson junction and apply Josephson junctions as well as phase coherence among the superfluid aperture array are discussed. DOI: 10

Sato, Yuki

185

Pinned fluxons in a Josephson junction with a finite-length inhomogeneity  

E-Print Network [OSTI]

Pinned fluxons in a Josephson junction with a finite-length inhomogeneity Gianne Derks , Arjen as limits of our results on microresonators. Keywords: Josephson junction, inhomogeneous sine Josephson junction tt = xx - D sin() + - t, (1) where x and t are the spatial and temporal variable

Doelman, Arjen

186

Three-dimensional Josephson junction networks with coupling inhomogeneities in magnetic fields  

E-Print Network [OSTI]

Three-dimensional Josephson junction networks with coupling inhomogeneities in magnetic fields A on the static magnetic response of a three-dimensional 8 · 8 · 8 network of Josephson junctions is studied of one-dimensional and two-dimensional Josephson junction networks (1D, 2D-JJNs) has been extensively

Di Matteo, Tiziana

187

Direct Observation of Dynamical Bifurcation in a Superfluid Josephson Junction Supradeep Narayana and Yuki Sato  

E-Print Network [OSTI]

Direct Observation of Dynamical Bifurcation in a Superfluid Josephson Junction Supradeep Narayana Josephson junction. We excite the superfluid plasma resonance into a nonlinear regime by driving below.205302 PACS numbers: 67.25.dg, 07.60.Ly, 47.20.Ky, 85.25.Cp A superfluid Josephson junction is formed

Sato, Yuki

188

Nanomechanical-resonator-induced synchronization in Josephson junction arrays B. R. Trees* and S. Natu  

E-Print Network [OSTI]

, and an interaction energy due to the piezo- electric effect between the NEM and the junctions. Phase lockingNanomechanical-resonator-induced synchronization in Josephson junction arrays B. R. Trees* and S that includes the following effects: the charging and Josephson energies of the junctions, dissipation

Stroud, David

189

Josephson-junction arrays with long-range interactions J. Kent Harbaugh and D. Stroud  

E-Print Network [OSTI]

Josephson-junction arrays with long-range interactions J. Kent Harbaugh and D. Stroud Department-voltage (IV) characteristics of a Josephson-junction array with long-range inter- actions. The array consists of two sets of equally spaced parallel superconducting wires placed at right angles. A Josephson junction

Stroud, David

190

Quantum phase transitions and persistent currents in Josephson-junction ladders Minchul Lee  

E-Print Network [OSTI]

Quantum phase transitions and persistent currents in Josephson-junction ladders Minchul Lee- dimensional Josephson-junction arrays. We will focus particularly on the roles of excitonlike pairs.40.Db, 73.23.Hk I. INTRODUCTION Systems of Josephson junctions between small supercon- ducting grains

Choi, Mahn-Soo

191

Depinning of kinks in a Josephson-junction ratchet array E. Trias,1  

E-Print Network [OSTI]

Depinning of kinks in a Josephson-junction ratchet array E. Tri´as,1 J. J. Mazo,1,2 F. Falo,2 and T kinks in a ratchet potential using a fabricated circular array of Josephson junctions. Our ratchet . Josephson junctions are solid state realizations of a simple pendulum. By coupling them, it is possible

Orlando, Terry P.

192

Switching current measurements of large area Josephson tunnel junctions A. Wallraff,a)  

E-Print Network [OSTI]

the potential. This corresponds to a transition of the Josephson junction from a superconducting zero the system is coupled. Thermal activation TA in a current-biased Josephson junction has been studied both damping.11,12 At low temperatures the quantum mechanical properties of Josephson junctions have been

Wallraff, Andreas

193

Building America Case Study: Conway Street Apartments, Greenfield...  

Energy Savers [EERE]

Learned * Ductless heat pumps allow for much lower first costs than conventional heating and cooling systems. With an efficient envelope, operating costs are also very...

194

Greenfield, New Hampshire: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

New Hampshire: Energy Resources New Hampshire: Energy Resources Jump to: navigation, search Equivalent URI DBpedia Coordinates 42.9506384°, -71.8723003° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":42.9506384,"lon":-71.8723003,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

195

Determination of the current density distribution in Josephson junctions.  

SciTech Connect (OSTI)

A technique is described for recovering the missing phase information for a set of critical current measurements as a function of an applied magnetic field I{sub c}(B). In many cases the current density j(x) across the boundary for a Josephson junction can be determined.

Carmody, M; Landree, E.; Marks, L. D.; Merkle, K. L.; Northwestern Univ.

1999-01-01T23:59:59.000Z

196

Tunneling Qubit Operation on a Protected Josephson Junction Array  

E-Print Network [OSTI]

We discuss a protected quantum computation process based on a hexagon Josephson junction array. Qubits are encoded in the punctured array, which is topologically protected. The degeneracy is related to the number of holes. The topological degeneracy is lightly shifted by tuning the flux through specific hexagons. We also show how to perform single qubit operation and basic quantum gate operations in this system.

Zhi Yin; Sheng-Wen Li; Yi-Xin Chen

2010-01-29T23:59:59.000Z

197

Topological order in Josephson junction ladders with Mobius boundary conditions  

E-Print Network [OSTI]

We propose a CFT description for a closed one-dimensional fully frustrated ladder of quantum Josephson junctions with Mobius boundary conditions, in particular we show how such a system can develop topological order. Such a property is crucial for its implementation as a "protected" solid state qubit.

G. Cristofano; V. Marotta; A. Naddeo

2005-03-22T23:59:59.000Z

198

Critical current of a lateral Josephson junction for layered superconductors  

Science Journals Connector (OSTI)

We have studied the effect of an applied magnetic field Hext on the critical current Ic of a lateral superconducting-insulating-superconducting (S-I-S) Josephson junction between two layered superconductors. In this configuration the layering direction of the superconducting electrodes is parallel to the plane of the junction. We find that the behavior of Ic(Hext) is determined by the parameter ?=jcd0/??j?, where ?? and j? are, respectively, the penetration depth and the interlayer critical current characterizing the bulk superconductors. Also jc is the critical current density between layers on opposite sides of the junction, while d0 is the layer thickness. For ??1 the length scale for field penetration along the direction of the junction is given by ??, leading to the usual Fraunhofer dependence for Ic(Hext). The scenario is vastly different for ??1. In this case the intraelectrode layer couplings are relatively weak and Josephson vortex penetration is found to occur between the layers. The physics of this situation is determined by the standard map. We find that in the absence of an external field Josephson vortices penetrate the structure and form an ordered array. This leads to a value of Ic(0) proportional to the number of layers N. This situation is however upset by a small external field. In this case the vortex distribution acquires an interesting chaotic character which leads to a sizable decrease of the critical current to a value Ic(Hext)? ?N .

Mikhail V. Fistul and Gabriele F. Giuliani

1994-09-01T23:59:59.000Z

199

Particle pulses from superconducting aluminum tunnel junction detectors  

SciTech Connect (OSTI)

Superconducting aluminum tunnel junctions have been developed for use as particle detectors. This paper presents results on static characteristics of these devices. We also present results from tests of these detectors with 6-keV X-rays. An extrapolation of the properties of these detectors to one suitable for dark-matter detectors is discussed.

Stricker, D.A.; Bing, D.D.; Bland, R.W.; Dickson, S.C.; Dignan, T.; Johnson, R.T.; Lockhart, J.M.; Laws, K.; Simon, M.W.; Watson, R. (San Francisco State Univ., Physics and Astronomy Dept. San Francisco, CA (US))

1991-03-01T23:59:59.000Z

200

Nonequilibrium electron tunneling in metal-insulator-metal junctions  

Science Journals Connector (OSTI)

The small structure in the conductance curve near zero bias of metal-insulator-metal tunnel junctions has been studied extensively. These experiments are analyzed in detail in a nonequilibrium model. It is shown that this type of zero-bias anomaly can be accounted for entirely by an electron bottleneck arising from the blocking of tunneling states due to nonzero electron relaxation times.

J. G. Adler; H. J. Kreuzer; J. Straus

1975-04-15T23:59:59.000Z

Note: This page contains sample records for the topic "junction greenfield grundy" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

Aluminum tunnel junction detector operation in an adiabatic demagnetization refrigerator  

SciTech Connect (OSTI)

Superconducting tunnel junction detectors are being developed as both particle and X-ray detectors. Aluminum junctions are desirable for detectors because of their strong native oxide barriers, and because the small energy gap of aluminum is a good match to ballistic phonons generated by particle interactions in single crystals of silicon or other low acoustic-loss insulating crystals. Aluminum tunnel junction detectors must be operated near 0.1 T{sub C} which is 110 mK for aluminum. To operate detectors at these temperatures, we have developed adiabatic demagnetization refrigerators (ADRs) for the laboratory and prototype ADRs for space based operation. These cryogenic systems are simpler, more convenient and more portable than most dilution refrigerators. We have demonstrated that the magnetic field of the ADR need not compromise the performance of aluminum tunnel junctions. We have recently initiated a program to develop superconducting tunnel junctions (STJs) as high resolution X-ray detectors and low energy threshold particle detectors. This complements our existing program in which we are developing high resolution X-ray microcalorimeter detectors. One of our goals for both of these cryogenic detector development efforts is to observe X-ray emission from cosmic sources. This requires a refrigeration system that can operate under zero gravity space flight conditions. For the microcalorimeter project, temperatures of 100 mK and below are required to sufficiently reduce the heat capacity of the device. We have therefore developed an adiabatic demagnetization refrigerator (ADR) system which can be configured for space flight.

Labov, S.; Silver, E.; Le Gros, M. (Lawrence Livermore National Lab., CA (United States)); Bland, R.W.; Dickson, S.C.; Dignan, T.G.; Laws, K.; Johnson, R.T.; Simon, M.W.; Stricker, D.A.; Watson, R.M. (San Francisco State Univ., CA (United States)); Madden, N.; Landis, D. (Lawrence Berkeley Lab., CA (United States))

1992-01-30T23:59:59.000Z

202

Quantum efficiency of a microwave photon detector based on a current-biased Josephson junction  

E-Print Network [OSTI]

We analyze the quantum efficiency of a microwave photon detector based on a current-biased Josephson junction. We consider the Jaynes-Cummings Hamiltonian to describe coupling between the photon field and the junction. We then take into account coupling of the junction and the resonator to the environment. We solve the equation of motion of the density matrix of the resonator-junction system to compute the quantum efficiency of the detector as a function of detection time, bias current, and energy relaxation time. Our results indicate that junctions with modest coherence properties can provide efficient detection of single microwave photons, with quantum efficiency in excess of 80%.

Poudel, Amrit; Vavilov, Maxim G

2012-01-01T23:59:59.000Z

203

Mutual synchronization of two stacks of intrinsic Josephson junctions in cuprate superconductors  

SciTech Connect (OSTI)

Certain high-T{sub c} cuprate superconductors, which naturally realize a stack of Josephson junctions, thus can be used to generate electromagnetic waves in the terahertz region. A plate-like single crystal with 10{sup 4} junctions without cavity resonance was proposed to achieve strong radiation. For this purpose, it is required to synchronize the Josephson plasma oscillation in all junctions. In this work, we propose to use two stacks of junctions shunted in parallel to achieve synchronization. The two stacks are mutually synchronized in the whole IV curve, and there is a phase shift between the plasma oscillation in the two stacks. The phase shift is nonzero when the number of junctions in different stacks is the same, while it can be arbitrary when the number of junctions is different. This phase shift can be tuned continuously by applying a magnetic field when all the junctions are connected by superconducting wires.

Lin, Shi-Zeng [Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

2014-05-07T23:59:59.000Z

204

Quantum Dissociation of a Vortex-Antivortex Pair in a Long Josephson Junction M.V. Fistul,1  

E-Print Network [OSTI]

Quantum Dissociation of a Vortex-Antivortex Pair in a Long Josephson Junction M.V. Fistul,1 A VAV pair manifests itself in a switching of the Josephson junction from the superconducting biased single Josephson junctions (JJs), various SQUIDs, and small Josephson junction arrays, contain

Wallraff, Andreas

205

PHYSICAL REVIEW B 87, 214511 (2013) Linewidth of the electromagnetic radiation from Josephson junctions near cavity resonances  

E-Print Network [OSTI]

emission from intrinsic Josephson junctions in high-Tc cuprate superconductors has been detected recently for a single Josephson junction nor for a stack of the intrinsic Josephson junctions realized in cuprateRevB.87.214511 PACS number(s): 74.50.+r, 74.25.Gz, 85.25.Cp In a Josephson junction (JJ) biased by a dc

Alexei, Koshelev

206

Princeton Junction, New Jersey: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

Junction, New Jersey: Energy Resources Junction, New Jersey: Energy Resources Jump to: navigation, search Equivalent URI DBpedia Coordinates 40.3173301°, -74.6198791° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":40.3173301,"lon":-74.6198791,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

207

Iron Junction, Minnesota: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

Junction, Minnesota: Energy Resources Junction, Minnesota: Energy Resources Jump to: navigation, search Equivalent URI DBpedia Coordinates 47.416427°, -92.60665° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":47.416427,"lon":-92.60665,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

208

Monmouth Junction, New Jersey: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

Junction, New Jersey: Energy Resources Junction, New Jersey: Energy Resources Jump to: navigation, search Equivalent URI DBpedia Coordinates 40.3789957°, -74.5465436° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":40.3789957,"lon":-74.5465436,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

209

Biggs Junction, Oregon: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

Biggs Junction, Oregon: Energy Resources Biggs Junction, Oregon: Energy Resources Jump to: navigation, search Equivalent URI DBpedia Coordinates 45.669846°, -120.8328408° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":45.669846,"lon":-120.8328408,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

210

Grand Junction, Colorado: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

Junction, Colorado: Energy Resources Junction, Colorado: Energy Resources Jump to: navigation, search Equivalent URI DBpedia Coordinates 39.0638705°, -108.5506486° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":39.0638705,"lon":-108.5506486,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

211

Pacific Junction, Iowa: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

Junction, Iowa: Energy Resources Junction, Iowa: Energy Resources Jump to: navigation, search Equivalent URI DBpedia Coordinates 41.0186105°, -95.7991734° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":41.0186105,"lon":-95.7991734,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

212

Essex Junction, Vermont: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

Junction, Vermont: Energy Resources Junction, Vermont: Energy Resources Jump to: navigation, search Equivalent URI DBpedia Coordinates 44.4906054°, -73.1109604° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":44.4906054,"lon":-73.1109604,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

213

Chiral Edge Currents in a Holographic Josephson Junction  

E-Print Network [OSTI]

We discuss the Josephson effect and the appearance of dissipationless edge currents in a holographic Josephson junction configuration involving a chiral, time-reversal breaking, superconductor in 2+1 dimensions. Such a superconductor is expected to be topological, thereby supporting topologically protected gapless Majorana-Weyl edge modes. Such modes manifest themselves in chiral dissipationless edge currents, which we exhibit and investigate in the context of our construction. The physics of the Josephson current itself, though expected to be unconventional in some non-equilibrium settings, is shown to be conventional in our setup which takes place in thermal equilibrium. We comment on various ways in which the expected Majorana nature of the edge excitations, and relatedly the unconventional nature of topological Josephson junctions, can be verified in the holographic context.

Rozali, Moshe

2013-01-01T23:59:59.000Z

214

Josephson Junction Arrays with Bose-Einstein Condensates  

E-Print Network [OSTI]

We report on the direct observation of an oscillating atomic current in a one-dimensional array of Josephson junctions realized with an atomic Bose-Einstein condensate. The array is created by a laser standing-wave, with the condensates trapped in the valleys of the periodic potential and weakly coupled by the inter-well barriers. The coherence of multiple tunneling between adjacent wells is continuously probed by atomic interference. The square of the small-amplitude oscillation frequency is proportional to the microscopic tunneling rate of each condensate through the barriers, and provides a direct measurement of the Josephson critical current as a function of the intermediate barrier heights. Our superfluid array may allow investigation of phenomena so far inaccessible to superconducting Josephson junctions and lays a bridge between the condensate dynamics and the physics of discrete nonlinear media.

F. S. Cataliotti; S. Burger; C. Fort; P. Maddaloni; F. Minardi; A. Trombettoni; A. Smerzi; M. Inguscio

2001-08-07T23:59:59.000Z

215

Chiral Edge Currents in a Holographic Josephson Junction  

E-Print Network [OSTI]

We discuss the Josephson effect and the appearance of dissipationless edge currents in a holographic Josephson junction configuration involving a chiral, time-reversal breaking, superconductor in 2+1 dimensions. Such a superconductor is expected to be topological, thereby supporting topologically protected gapless Majorana-Weyl edge modes. Such modes manifest themselves in chiral dissipationless edge currents, which we exhibit and investigate in the context of our construction. The physics of the Josephson current itself, though expected to be unconventional in some non-equilibrium settings, is shown to be conventional in our setup which takes place in thermal equilibrium. We comment on various ways in which the expected Majorana nature of the edge excitations, and relatedly the unconventional nature of topological Josephson junctions, can be verified in the holographic context.

Moshe Rozali; Alexandre Vincart-Emard

2013-11-28T23:59:59.000Z

216

Resistance of Josephson Junction Arrays at Low Temperatures  

E-Print Network [OSTI]

We study motion of vortices in arrays of Josephson junctions at zero temperature where it is controlled by quantum tunneling from one plaquette to another. The tunneling process is characterized by a finite time and can be slow compared to the superconducting gap (so that $\\tau \\Delta >> 1$). The dissipation which accompanies this process arises from rare processes when a vortex excites a quasiparticle above the gap while tunneling through a single junction. We find that the dissipation is significant even in the case $\\tau \\Delta >> 1$, in particular it is not exponentially small in this parameter. We use the calculated energy dissipation for the single vortex jump to estimate the physical resistance of the whole array.

L. B. Ioffe; B. N. Narozhny

1998-07-25T23:59:59.000Z

217

Coso Junction, California: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

Page Page Edit with form History Facebook icon Twitter icon » Coso Junction, California: Energy Resources Jump to: navigation, search Name Coso Junction, California Equivalent URI DBpedia GeoNames ID 5339829 Coordinates 36.0449439°, -117.9472993° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":36.0449439,"lon":-117.9472993,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

218

Electron transport through a metal-molecule-metal junction  

Science Journals Connector (OSTI)

Molecules of bisthiolterthiophene have been adsorbed on the two facing gold electrodes of a mechanically controllable break junction in order to form metal-molecule(s)-metal junctions. Current-voltage (I-V) characteristics have been recorded at room temperature. Zero bias conductances were measured in the 10100 nS range and different kinds of nonlinear I-V curves with steplike features were reproducibly obtained. Switching between different kinds of I-V curves could be induced by varying the distance between the two metallic electrodes. The experimental results are discussed within the framework of tunneling transport models explicitly taking into account the discrete nature of the electronic spectrum of the molecule.

C. Kergueris; J.-P. Bourgoin; S. Palacin; D. Esteve; C. Urbina; M. Magoga; C. Joachim

1999-05-15T23:59:59.000Z

219

Do ridge-ridge-fault triple junctions exist on Earth? Evidence from the Aden-Owen-Carlsberg junction in the NW Indian Ocean  

E-Print Network [OSTI]

and the East Pacific Rise, and the Aden-Owen-Carlsberg (AOC) triple junction between the Owen fracture zone before connecting to the ridges. We here report the results of a marine geophysical survey of the AOC of distributed deformation. The AOC triple junction appears to be in a transient stage between a former triple

220

High-frequency losses in tin Josephson tunnel junctions  

Science Journals Connector (OSTI)

The losses associated with the excitation of surface plasma oscillations in Fiske modes in tin Josephson junctions, at frequencies from 20 to 270 GHz, were measured by studying the currentvoltage characteristics as a function of magnetic field. Our results generally support Economou and Ngai's theory of surface-plasma oscillations and Miller's calculation of the conductivity of superconductors. At lower temperatures, discrepancies that include an anomalous peak in the frequency dependence of the loss may reflect a small disagreement with Miller's results.

T. C. Wang and R. I. Gayley

1978-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "junction greenfield grundy" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

Junction Transport in Epitaxial Film Silicon Heterojunction Solar Cells: Preprint  

SciTech Connect (OSTI)

We report our progress toward low-temperature HWCVD epitaxial film silicon solar cells on inexpensive seed layers, with a focus on the junction transport physics exhibited by our devices. Heterojunctions of i/p hydrogenated amorphous Si (a-Si) on our n-type epitaxial crystal Si on n++ Si wafers show space-charge-region recombination, tunneling or diffusive transport depending on both epitaxial Si quality and the applied forward voltage.

Young, D. L.; Li, J. V.; Teplin, C. W.; Stradins, P.; Branz, H. M.

2011-07-01T23:59:59.000Z

222

Emission of Microwave Photon Pairs by a Tunnel Junction  

E-Print Network [OSTI]

Generation and control of non-classical electromagnetic fields is of crucial importance for quantum information physics. While usual methods for the production of such fields rely on a non-linearity (of a crystal, a Josephson junction, etc.), a recent experiment performed on a normal conductor, a tunnel junction under microwave irradiation, has unveiled an alternative: the use of electron shot noise in a quantum conductor\\cite{PAN_squeezing}. Here we show that such a device can emit \\emph{pairs of microwave photons} of different frequencies with a rate as high as that of superconducting Josephson junctions\\cite{Flurin}. This results in intensity fluctuations of the photon field at two different frequencies being correlated below the photon shot noise,i.e. two-mode amplitude squeezing. Our experiment constitutes a fundamental step towards the understanding of electronic noise in terms of quantum optics, and shows that even a normal conductor could be used as a resource for quantum information processing.

Jean-Charles Forgues; Christian Lupien; Bertrand Reulet

2014-03-21T23:59:59.000Z

223

Statistics of avalanches in the self-organized criticality state of a Josephson junction  

SciTech Connect (OSTI)

Magnetic flux avalanches in Josephson junctions that include superconductor-insulator-superconductor (SIS) tunnel junctions and are magnetized at temperatures lower than approximately 5 K have been studied in detail. Avalanches are of stochastic character and appear when the magnetic field penetration depth {lambda} into a junction becomes equal to the length a of the Josephson junction with a decrease in the temperature. The statistical properties of such avalanches are presented. The size distribution of the avalanches is a power law with a negative noninteger exponent about unity, indicating the self-organized criticality state. The self-organized criticality state is not observed in Josephson junctions with a superconductor-normal metal-superconductor (SNS) junction.

Matizen, E. V.; Martynets, V. G., E-mail: mart@niic.nsc.ru; Bezverkhii, P. P. [Russian Academy of Sciences, Nikolaev Institute of Inorganic Chemistry, Siberian Division (Russian Federation)

2010-08-15T23:59:59.000Z

224

Self-consistent solution for proximity effect and Josephson current in ballistic graphene SNS Josephson junctions  

SciTech Connect (OSTI)

We use a tight-binding Bogoliubov-de Gennes (BdG) formalism to self-consistently calculate the proximity effect, Josephson current, and local density of states in ballistic graphene SNS Josephson junctions. Both short and long junctions, with respect to the superconducting coherence length, are considered, as well as different doping levels of the graphene. We show that self-consistency does not notably change the current-phase relationship derived earlier for short junctions using the non-selfconsistent Dirac-BdG formalism but predict a significantly increased critical current with a stronger junction length dependence. In addition, we show that in junctions with no Fermi level mismatch between the N and S regions superconductivity persists even in the longest junctions we can investigate, indicating a diverging Ginzburg-Landau superconducting coherence length in the normal region.

Black-Schaffer, Annica M.

2010-04-06T23:59:59.000Z

225

OPTIMIZATION OF a-SiGe BASED TRIPLE, TANDEM AND SINGLE-JUNCTION SOLAR Xunming Deng  

E-Print Network [OSTI]

at the University of Toledo (UT) in the fabrication of high-efficiency triple, tandem and single-junction solar with 12.5% initial efficiency and 10.7% stable efficiency, tandem-junction a-Si/a-SiGe solar cells with 12.9% initial efficiency, and single-junction a-SiGe solar cells with 12.5-13% initial efficiency and 10

Deng, Xunming

226

On the Harmonic approximation for large Josephson junction coupling charge qubits  

E-Print Network [OSTI]

We revisit the harmonic approximation (HA) for a large Josephson junction interacting with some charge qubits through the variational approach for the quantum dynamics of the junction-qubit coupling system. By making use of numerical calculation and analytical treatment, the conditions under which HA works well can be precisely presented to control the parameters implementing the two-qubit quantum logical gate through the couplings to the large junction with harmonic oscillator (HO) Hamiltonian.

T. Shi; B. Chen; Z. Song; C. P. Sun

2004-09-23T23:59:59.000Z

227

Characteristics of high-transmission-probability tunnel junctions for use as particle detectors  

SciTech Connect (OSTI)

Interest in the problem of the galactic dark matter has stimulated development of particle detectors sensitive to very low energies. Superconducting tunnel junctions may be useful in such detectors. We describe here superconducting tunnel junctions with thin barriers which may be suitable for this purpose. We present I-V characteristics and data on the temperature dependence of the subgap tunneling current. We also present some scanning-electron-microscope observations of the thin films of the tunnel junctions.

Stricker, D.A.; Alba, G.P.; Anderson, C.C.; Bing, D.D.; Bland, R.W.; Dickson, S.C.; Dignan, T.G.; Gagnon, P.; Johnson, R.T.; Seneclauze, C.M.

1988-12-31T23:59:59.000Z

228

Characteristics of high-transmission-probability tunnel junctions for use as particle detectors  

SciTech Connect (OSTI)

Interest in the problem of the galactic dark matter has stimulated development of particle detectors sensitive to very low energies. Superconducting tunnel junctions may be useful in such detectors. We describe here superconducting tunnel junctions with thin barriers which may be suitable for this purpose. We present I-V characteristics and data on the temperature dependence of the subgap tunneling current. We also present some scanning-electron-microscope observations of the thin films of the tunnel junctions.

Stricker, D.A.; Alba, G.P.; Anderson, C.C.; Bing, D.D.; Bland, R.W.; Dickson, S.C.; Dignan, T.G.; Gagnon, P.; Johnson, R.T.; Seneclauze, C.M.

1988-01-01T23:59:59.000Z

229

Characteristics of high-transmission-probability tunnel junctions for use as particle detectors  

SciTech Connect (OSTI)

Interest in the problem of the galactic dark matter has stimulated development of particle detectors sensitive to very low energies. Superconducting tunnel junctions may be useful in such detectors. The authors describe superconducting tunnel junctions with thin barriers which may be suitable for this purpose. They present I-V characteristics and data on the temperature dependence of the subgap tunneling current. They also present some scanning-electron-microscope observations of the thin films of the tunnel junctions.

Stricker, D.A.; Alba, G.P.; Anderson, C.C.; Bing, D.D.; Bland, R.W.; Dickson, S.C.; Dignan, T.G.; Gagnon, P.; Johnson, R.T.; Seneclauze, C.M.

1989-03-01T23:59:59.000Z

230

Mean-field dynamics of a Bose Josephson junction in an optical cavity  

E-Print Network [OSTI]

We study the mean-field dynamics of a Bose Josephson junction which is dispersively coupled to a single mode of a high-finesse optical cavity. An effective classical Hamiltonian for the Bose Josephson junction is derived and its dynamics is studied in the perspective of phase portrait. It is shown that the strong condensate-field coupling does alter the dynamics of the Bose Josephson junction drastically. The possibility of coherent manipulating and \\textsl{in situ} observation of the dynamics of the Bose Josephson junction is discussed.

J. M. Zhang; W. M. Liu; D. L. Zhou

2008-04-22T23:59:59.000Z

231

Comment on "Analysis of quantum coherent semiconductor quantum dot p-i-n junction photovoltaic cells"  

E-Print Network [OSTI]

This is a comment on PRL paper by A.P. Kirk "Analysis of quantum coherent semiconductor quantum dot p-i-n junction photovoltaic cells"

Scully, Marlan O

2010-01-01T23:59:59.000Z

232

Estimating commuter rail demand to Kendall Square along the Grand Junction Corridor .  

E-Print Network [OSTI]

??Since acquiring the Grand Junction Railroad in June 2010 from CSX, the Massachusetts Bay Transit Authority (MBTA) has explored the possibility of using the line (more)

Dohm, James

2012-01-01T23:59:59.000Z

233

E-Print Network 3.0 - arsenide junction-field-effect transistors...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Texas at Arlington Materials Science and Engineering Department Summary: and optoelectronic devices. Topics include electrical properties of semiconductors, p-n junctions,...

234

E-Print Network 3.0 - annular josephson junctions Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

<< < 1 2 3 4 5 > >> 41 Collective Josephson vortex dynamics in a finite number of stacked intrinsic Josephson junctions Myung-Ho Bae,1, Summary: Collective Josephson vortex...

235

Anomalous Finite-Size Effect in Superconducting Josephson Junction Arrays  

SciTech Connect (OSTI)

We show that a previously reported discrepancy between simulations of superconducting Josephson junction arrays and the theoretical analysis of Ambegaokar, Halperin, Nelson, and Siggia (AHNS) [Phys. Rev. Lett. 40, 783 (1978)] is rooted in a peculiar finite-size effect under periodic boundary conditions. Our simulation results for the largest array support the power-law I-V curves predicted by AHNS. Analysis of the vortex dynamics reveals two intrinsic length scales set by the applied current, which define three size regimes with distinctive I-V characteristics.

Chen, Qing-Hu; Tang, Lei-Han; Tong, Peiqing

2001-08-06T23:59:59.000Z

236

Transitions in two sinusoidally coupled Josephson junction rotators  

SciTech Connect (OSTI)

We investigate the dynamics of two sinusoidally coupled Josephson junction rotators to provide a clear knowledge of the behaviors in different regions of the parameter space. The dynamical states are identified, and the transitions among these states are studied. The properties of the current-voltage curves are investigated. Further more, we observed the chaotic states in some regions of parameter space. We conjecture it may caused by the competition of two periodic potentials: one is the external field, another is the interacting of two particles.

Qian Min [School of Mathematical Sciences, Peking University, Beijing 100871 (China); Wang Jiazeng [Department of Mathematics, Shanghai University, Shanghai 200444 (China)], E-mail: wangjiazen@yahoo.com.cn

2008-08-15T23:59:59.000Z

237

Coherent Oscillations in an Exciton-Polariton Josephson Junction  

SciTech Connect (OSTI)

We report on the observation of spontaneous coherent oscillations in a microcavity polariton bosonic Josephson junction. Condensation of exciton polaritons here takes place under incoherent excitation in a double potential well naturally formed in the disorder. Coherent oscillations set on at an excitation power well above the condensation threshold. The time resolved population and phase dynamics reveal the analogy with the ac Josephson effect. A theoretical two-mode model describes the observed effects, explaining how the different realizations of the pulsed experiment can be in phase.

Lagoudakis, K. G.; Pietka, B.; Deveaud-Pledran, B. [ICMP, Ecole Polytechnique Federale de Lausanne (EPFL), 1015 Lausanne (Switzerland); Wouters, M. [ITP, Ecole Polytechnique Federale de Lausanne (EPFL), 1015 Lausanne (Switzerland); Andre, R. [Institut Neel, CNRS, Grenoble (France)

2010-09-17T23:59:59.000Z

238

Tunneling qubit operation on a protected Josephson junction array  

SciTech Connect (OSTI)

We propose a complete quantum computation process on a topologically protected Josephson junction array system, originally proposed by Ioffe and Feigel'man [Phys. Rev. B 66, 224503 (2002)]. Logical qubits for computation are encoded in the punctured array. The number of qubits is determined by the number of holes. The topological degeneracy is lightly shifted by tuning the flux along specific paths. We show how to perform both single-qubit and basic quantum-gate operations in this system, especially the controlled-NOT (CNOT) gate.

Yin Zhi; Li Shengwen; Chen Yixin [Zhejiang Insitute of Modern Physics, Zhejiang University, Hangzhou 310027 (China)

2010-01-15T23:59:59.000Z

239

Resonantly phase-matched Josephson junction traveling wave parametric amplifier  

E-Print Network [OSTI]

We develop a technique to overcome phase-mismatch in Josephson-junction traveling wave parametric amplifiers in order to achieve high gain over a broad bandwidth. Using "resonant phase matching," we design a compact superconducting device consisting of a transmission line with subwavelength resonant inclusions that simultaneously achieves a gain of 20 dB, an instantaneous bandwidth of 3 GHz, and a saturation power of -98 dBm. Such an amplifier is well-suited to cryogenic broadband microwave measurements such as the multiplexed readout of quantum coherent circuits based on superconducting, semiconducting, or nano-mechanical elements as well as traditional astronomical detectors.

Kevin O'Brien; Chris Macklin; Irfan Siddiqi; Xiang Zhang

2014-06-09T23:59:59.000Z

240

Replica Theory and Large D Josephson Junction Hypercubic Models  

E-Print Network [OSTI]

We study the statistical mechanics of a $D$-dimensional array of Josephson junctions in presence of a magnetic field on a lattice of side $2$. In the high temperature region the thermodynamical properties can be computed in the limit $D \\to \\infty$. A conjectural form of the thermodynamic properties in the low temperature phase is obtained by assuming that they are the same of an appropriate spin glass system, based on quenched disordered couplings. Numerical simulations show that this conjecture is very accurate in one regime of the magnetic field, while it is probably slightly inaccurate in a second regime.

Enzo Marinari; Giorgio Parisi; Felix Ritort

1995-02-16T23:59:59.000Z

Note: This page contains sample records for the topic "junction greenfield grundy" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

Dynamics of Josephson junction systems in the computational subspace  

E-Print Network [OSTI]

The quantum dynamics of the Josephson junction system in the computational subspace is investigated. A scheme for the controlled not operation is given for two capasitively coupled SQUIDs. In this system, there is no systematic error for the two qubit operation. For the inductively coupled SQUIDs, the effective Hamiltonian causes systematic errors in the computational subspace for the two qubit operation. Using the purterbation theory, we construct a more precise effective Hamiltonian. This new effective Hamiltonian reduces the systematic error to the level much lower than the threshold of the fault resilent quantum computation.

Wang Xiang-Bin; Matsumoto Keiji; Fan Heng; Y. Nakamura

2001-12-05T23:59:59.000Z

242

Manipulating transport through a single-molecule junction  

SciTech Connect (OSTI)

Molecular Electronics deals with the realization of elementary electronic devices that rely on a single molecule. For electronic applications, the most important property of a single molecule is its conductance. Here we show how the conductance of a single octanethiol molecule can be measured and manipulated by varying the contact's interspace. This mechanical gating of the single molecule junction leads to a variation of the conductance that can be understood in terms of a tunable image charge effect. The image charge effect increases with a decrease of the contact's interspace due to a reduction of the effective potential barrier height of 1.5 meV/pm.

Sotthewes, Kai; Heimbuch, Ren; Zandvliet, Harold J. W. [Physics of Interfaces and Nanomaterials, MESA Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500AE Enschede (Netherlands)] [Physics of Interfaces and Nanomaterials, MESA Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500AE Enschede (Netherlands)

2013-12-07T23:59:59.000Z

243

Electron transport in normal-metal/superconductor junctions  

E-Print Network [OSTI]

. 1. Conductance G as a function of the voltage V for an NS (d-wave! junction with $100% interface at T50 and t0 /t50.5. The present calculation ~solid line! is compared with the BTK result ~dashed line!. PRB 61ZHAO, AND CHIA-REN HU FIG. 2.... The same as Fig. 1 but at t0 /t51. dominant contribution to the conductance in the BTK theory. Under the present assumption, however, the transport is due to the decay of quasiparticles in both sides. Such a decaying process is more complex than the BTK...

Yan, XZ; Zhao, HW; Hu, Chia-Ren.

2000-01-01T23:59:59.000Z

244

Inverted GaInP/(In)GaAs/InGaAs Triple-Junction Solar Cells with Low-Stress Metamorphic Bottom Junctions: Preprint  

SciTech Connect (OSTI)

We demonstrate high efficiency performance in two ultra-thin, Ge-free III-V semiconductor triple-junction solar cell device designs grown in an inverted configuration. Low-stress metamorphic junctions were engineered to achieve excellent photovoltaic performance with less than 3 x 106 cm-2 threading dislocations. The first design with band gaps of 1.83/1.40/1.00 eV, containing a single metamorphic junction, achieved 33.8% and 39.2% efficiencies under the standard one-sun global spectrum and concentrated direct spectrum at 131 suns, respectively. The second design with band gaps of 1.83/1.34/0.89 eV, containing two metamorphic junctions achieved 33.2% and 40.1% efficiencies under the standard one-sun global spectrum and concentrated direct spectrum at 143 suns, respectively.

Geisz, J. F.; Kurtz, S. R.; Wanlass, M. W.; Ward, J. S.; Duda, A.; Friedman, D. J.; Olson, J. M.; McMahon, W. E.; Moriarty, T. E.; Kiehl, J. T.; Romero, M. J.; Norman, A. G.; Jones, K. M.

2008-05-01T23:59:59.000Z

245

Diffusion current in a system of coupled Josephson junctions  

SciTech Connect (OSTI)

The role of a diffusion current in the phase dynamics of a system of coupled Josephson junctions (JJs) has been analyzed. It is shown that, by studying the temporal dependences of the superconducting, quasi-particle, diffusion, and displacement currents and the dependences of average values of these currents on the total current, it is possible to explain the main features of the current-voltage characteristic (CVC) of the system. The effect of a diffusion current on the character of CVC branching in the vicinity of a critical current and in the region of hysteresis, as well as on the part of CVC branch corresponding to a parametric resonance in the system is demonstrated. A clear interpretation of the differences in the character of CVC branching in a model of capacitively coupled JJs (CCJJ model) and a model of capacitive coupling with diffusion current (CCJJ+DC model) is proposed. It is shown that a decrease in the diffusion current in a JJ leads to the switching of this junction to an oscillating state. The results of model calculations are qualitatively consistent with the experimental data.

Shukrinov, Yu. M., E-mail: shukrinv@theor.jinr.ru; Rahmonov, I. R. [Joint Institute for Nuclear Research (Russian Federation)

2012-08-15T23:59:59.000Z

246

On the Chaotic Flux Dynamics in a Long Josephson Junction  

E-Print Network [OSTI]

Flux dynamics in an annular long Josephson junction is studied. Three main topics are covered. The first is chaotic flux dynamics and its prediction via Melnikov integrals. It turns out that DC current bias cannot induce chaotic flux dynamics, while AC current bias can. The existence of a common root to the Melnikov integrals is a necessary condition for the existence of chaotic flux dynamics. The second topic is on the components of the global attractor and the bifurcation in the perturbation parameter measuring the strength of loss, bias and irregularity of the junction. The global attractor can contain co-existing local attractors e.g. a local chaotic attractor and a local regular attractor. In the infinite dimensional phase space setting, the bifurcation is very complicated. Chaotic attractors can appear and disappear in a random fashion. Three types of attractors (chaos, breather, spatially uniform and temporally periodic attractor) are identified. The third topic is ratchet effect. Ratchet effect can be achieved by a current bias field which corresponds to an asymmetric potential, in which case the flux dynamics is ever lasting chaotic. When the current bias field corresponds to a symmetric potential, the flux dynamics is often transiently chaotic, in which case the ratchet effect disappears after sufficiently long time.

Z. C. Feng; Y. Charles Li

2009-07-16T23:59:59.000Z

247

Efficient broadband energy transfer via momentum matching at hybrid junctions of guided-waves  

E-Print Network [OSTI]

Efficient broadband energy transfer via momentum matching at hybrid junctions of guided://apl.aip.org/about/rights_and_permissions #12;Efficient broadband energy transfer via momentum matching at hybrid junctions of guided, The American University in Cairo, New Cairo 11835, Egypt (Received 2 August 2012; accepted 5 September 2012

248

TM-mode coupling to a Josephson junction S. J. Lewandowski  

E-Print Network [OSTI]

215 TM-mode coupling to a Josephson junction S. J. Lewandowski Instytut Fizyki PAN, 02-668 Warszawa-mode near cut-off are demonstrated to improve Josephson junction coupling to the waveguide. Revue Phys. Appl Sciences and available at http://dx.doi.org/10.1051/rphysap:01985002003021500 #12;216 Fig. 1. - Josephson

Boyer, Edmond

249

Nonlinear Phase Dynamics in a Driven Bosonic Josephson Junction Erez Boukobza,1  

E-Print Network [OSTI]

Nonlinear Phase Dynamics in a Driven Bosonic Josephson Junction Erez Boukobza,1 Michael G. Moore,2. The experimental realization of dilute-gas Bose-Einstein condensate (BEC) Josephson junctions [2­ 5] has led], in a double-BEC system in Ref. [13], and in a one-dimensional spinor BEC in Ref. [14]. The bosonic Josephson

Vardi, Amichay

250

Low temperature junction growth using hot-wire chemical vapor deposition  

DOE Patents [OSTI]

A system and a process for forming a semi-conductor device, and solar cells (10) formed thereby. The process includes preparing a substrate (12) for deposition of a junction layer (14); forming the junction layer (14) on the substrate (12) using hot wire chemical vapor deposition; and, finishing the semi-conductor device.

Wang, Qi; Page, Matthew; Iwaniczko, Eugene; Wang, Tihu; Yan, Yanfa

2014-02-04T23:59:59.000Z

251

A Hamilton-Jacobi approach to junction problems and application to traffic flows  

E-Print Network [OSTI]

A Hamilton-Jacobi approach to junction problems and application to traffic flows C. Imbert , R of a model case of first order Hamilton-Jacobi equations posed on a "junction", that is to say the union of such problems. Keywords: Hamilton-Jacobi equations, discontinuous Hamiltonians, viscosity solutions, optimal

Paris-Sud XI, Université de

252

Phonon Bottleneck in Graphene-Based Josephson Junctions at Millikelvin Temperatures I. V. Borzenets,1  

E-Print Network [OSTI]

Phonon Bottleneck in Graphene-Based Josephson Junctions at Millikelvin Temperatures I. V. Borzenets and superconducting branches in superconductor-graphene-superconductor Josephson junctions. We attribute thermalization by phonons at low temperatures (T & 1 K). The relationship between the applied power

Finkelstein, Gleb

253

Grand Junction, Colorado, Disposal Site Long-Term Surveillance and Maintenance Program Fact Sheet, July 2001  

Office of Legacy Management (LM)

Grand Junction Disposal Site Grand Junction Disposal Site Uranium ore was processed at the Climax millsite at Grand Junction, Colorado, between 1951 and 1970. The milling operations created process-related waste and tailings, a sandlike material containing radioactive materials and other contaminants. The tailings were an ideal and inexpensive construction material suitable for concrete, mortar, and fill. Accordingly, the tailings were widely used in the Grand Junction area for these purposes. The U.S. Department of Energy (DOE) encapsulated the tailings and other contaminated materials from the millsite and more than 4,000 vicinity properties in the Grand Junction area in an engineered disposal cell. Part of the disposal cell was completed in 1994; the remainder of the cell remains open until it is

254

Imaging the p-n junction in a gallium nitride nanowire with a scanning microwave microscope  

SciTech Connect (OSTI)

We used a broadband, atomic-force-microscope-based, scanning microwave microscope (SMM) to probe the axial dependence of the charge depletion in a p-n junction within a gallium nitride nanowire (NW). SMM enables the visualization of the p-n junction location without the need to make patterned electrical contacts to the NW. Spatially resolved measurements of S{sub 11}{sup ?}, which is the derivative of the RF reflection coefficient S{sub 11} with respect to voltage, varied strongly when probing axially along the NW and across the p-n junction. The axial variation in S{sub 11}{sup ?}? effectively mapped the asymmetric depletion arising from the doping concentrations on either side of the junction. Furthermore, variation of the probe tip voltage altered the apparent extent of features associated with the p-n junction in S{sub 11}{sup ?} images.

Imtiaz, Atif [Physical Measurement Laboratory, National Institute of Standards and Technology, Boulder, Colorado 80305 (United States); Department of Electrical, Computer, and Energy Engineering, University of Colorado, Boulder, Colorado 80309 (United States); Wallis, Thomas M.; Brubaker, Matt D.; Blanchard, Paul T.; Bertness, Kris A.; Sanford, Norman A.; Kabos, Pavel, E-mail: kabos@boulder.nist.gov [Physical Measurement Laboratory, National Institute of Standards and Technology, Boulder, Colorado 80305 (United States); Weber, Joel C. [Physical Measurement Laboratory, National Institute of Standards and Technology, Boulder, Colorado 80305 (United States); Department of Mechanical Engineering, University of Colorado, Boulder, Colorado 80309 (United States); Coakley, Kevin J. [Information Technology Laboratory, National Institute of Standards and Technology, Boulder, Colorado 80305 (United States)

2014-06-30T23:59:59.000Z

255

Overdamped Nb/Al-AlO{sub x}/Nb Josephson junctions  

SciTech Connect (OSTI)

We report the fabrication and characterization of overdamped Nb/Al-AlO{sub x}/Nb superconductor-insulator-superconductor Josephson junction whose fabrication process derives from that of the well-known hysteretic junctions. These junctions are an intermediate state between the superconductor-normal metal-superconductor and the superconductor-insulator-superconductor Josephson junctions. Stable and reproducible nonhysteretic current-voltage characteristics are obtained with a proper choice of the fabrication parameters. We have measured critical current densities J{sub C} from 10{sup 3} up to 2x10{sup 4} A/cm{sup 2}, with characteristic voltages from 80 to nearly 450 {mu}V. The junctions are stable against time and repeated thermal cycling.

Lacquaniti, V.; Cagliero, C.; Maggi, S.; Steni, R. [Thin Films Department, IEN 'G. Ferraris', Strada delle Cacce 91, I-10135, Torino (Italy)

2005-01-24T23:59:59.000Z

256

Model for a Josephson junction array coupled to a resonant cavity  

SciTech Connect (OSTI)

We describe a simple Hamiltonian for an underdamped Josephson array coupled to a single photon mode in a resonant cavity. Using a Hartree-like mean-field theory, we show that, for any given strength of coupling between the photon field and the Josephson junctions, there is a transition from incoherence to coherence as a function of N, the number of Josephson junctions in the array. Above that value of N, the energy in the photon field is proportional to N{sup 2}, suggestive of coherent emission. These features remain even when the junction parameters have some random variation from junction to junction, as expected in a real array. Both of these features agree with recent experiments by Barbara and co-workers. (c) 2000 The American Physical Society.

Harbaugh, J. Kent [Department of Physics, Ohio State University, 174 West 18th Avenue, Columbus, Ohio 43210 (United States)] [Department of Physics, Ohio State University, 174 West 18th Avenue, Columbus, Ohio 43210 (United States); Stroud, D. [Department of Physics, Ohio State University, 174 West 18th Avenue, Columbus, Ohio 43210 (United States)] [Department of Physics, Ohio State University, 174 West 18th Avenue, Columbus, Ohio 43210 (United States)

2000-06-01T23:59:59.000Z

257

Josephson junction of non-Abelian superconductors and non-Abelian Josephson vortices  

E-Print Network [OSTI]

A Josephson junction is made of two superconductors sandwiching an insulator, and a Josephson vortex is a magnetic vortex absorbed into the Josephson junction, whose dynamics can be described by the sine-Gordon equation. In a field theory framework, a flexible Josephson junction was proposed, in which the Josephson junction is represented by a domain wall separating two condensations and a Josephson vortex is a sine-Gordon soliton in the domain wall effective theory. In this paper, we propose a Josephson junction of non-Abelian color superconductors, that is described by a non-Abelian domain wall, and show that a non-Abelian vortex (color magnetic flux tube) absorbed into it is a non-Abelian Josephson vortex represented as a non-Abelian sine-Gordon soliton in the domain wall effective theory.

Muneto Nitta

2015-02-09T23:59:59.000Z

258

Josephson junction of non-Abelian superconductors and non-Abelian Josephson vortices  

E-Print Network [OSTI]

A Josephson junction is made of two superconductors sandwiching an insulator, and a Josephson vortex is a magnetic vortex absorbed into the Josephson junction, whose dynamics can be described by the sine-Gordon equation. In a field theory framework, a flexible Josephson junction was proposed, in which the Josephson junction is represented by a domain wall separating two condensations and a Josephson vortex is a sine-Gordon soliton in the domain wall effective theory. In this paper, we propose a Josephson junction of non-Abelian color superconductors, that is described by a non-Abelian domain wall, and show that a non-Abelian vortex (color magnetic flux tube) absorbed into it is a non-Abelian Josephson vortex represented as a non-Abelian sine-Gordon soliton in the domain wall effective theory.

Nitta, Muneto

2015-01-01T23:59:59.000Z

259

Magneto-electric coupling in a two-dimensional ballistic Josephson junction with in-plane magnetic texture  

E-Print Network [OSTI]

Magneto-electric coupling in a two-dimensional ballistic Josephson junction with in-plane magnetic, Germany (Dated: August 20, 2014) We study a Josephson junction made with a spin-textured bridge, when both-dimensional ballistic Josephson junction close to the critical temperature of the heterostructure, when an anomalous

Boyer, Edmond

260

PHYSICAL REVIEW E 88, 022908 (2013) Synchronization of a Josephson junction array in terms of global variables  

E-Print Network [OSTI]

PHYSICAL REVIEW E 88, 022908 (2013) Synchronization of a Josephson junction array in terms of Josephson junctions with a common LCR load. Application of the Watanabe-Strogatz approach [Physica D 74, 197 of oscillating physical systems that being coupled synchronize are Josephson junctions [2]. In theoretical

Pikovsky, Arkady

Note: This page contains sample records for the topic "junction greenfield grundy" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

Model for a Josephson junction array coupled to a resonant cavity J. Kent Harbaugh and D. Stroud  

E-Print Network [OSTI]

Model for a Josephson junction array coupled to a resonant cavity J. Kent Harbaugh and D. Stroud junctions, there is a transition from incoherence to coherence as a function of N, the number of Josephson-capacitance and underdamped Josephson junctions, quantum phase fluctua- tions inhibit phase locking.8­13 Thus, until recently

Stroud, David

262

Electrically Tunable Macroscopic Quantum Tunneling in a Graphene-Based Josephson Junction Gil-Ho Lee,1  

E-Print Network [OSTI]

Electrically Tunable Macroscopic Quantum Tunneling in a Graphene-Based Josephson Junction Gil.1103/PhysRevLett.107.146605 PACS numbers: 72.80.Vp, 73.40.?c, 74.45.+c, 85.25.Cp A Josephson junction [1 the fabri- cation of nanostructured proximity-coupled Josephson junctions based on conducting spacers

Lee, Hu-Jong

263

Incommensurate dynamics of resonant breathers in Josephson junction ladders M. V. Fistul, A. E. Miroshnichenko, and S. Flach  

E-Print Network [OSTI]

Incommensurate dynamics of resonant breathers in Josephson junction ladders M. V. Fistul, A. E and experimental studies of resonant localized resistive states in a Josephson junction ladder. These complex guides, in antiferromagnetic solids and in systems of interacting Josephson junctions.8­13 Especially

Flach, Sergej

264

Eigenstates of a small Josephson junction coupled to a resonant cavity W. A. Al-Saidi* and D. Stroud  

E-Print Network [OSTI]

Eigenstates of a small Josephson junction coupled to a resonant cavity W. A. Al-Saidi* and D; published 4 December 2001 We carry out a quantum-mechanical analysis of a small Josephson junction coupled the lowest two levels of the Josephson junction are retained in the Hamiltonian matrix. We noticed

Stroud, David

265

Charging Effects in the Inductively Shunted Josephson Junction Jens Koch, V. Manucharyan, M. H. Devoret, and L. I. Glazman  

E-Print Network [OSTI]

Charging Effects in the Inductively Shunted Josephson Junction Jens Koch, V. Manucharyan, M. H to shunt a Josephson junction determines if the charge transferred through the circuit is quantized by charge noise. DOI: 10.1103/PhysRevLett.103.217004 PACS numbers: 85.25.Cp, 74.50.+r The Josephson junction

Devoret, Michel H.

266

Observation of High Coherence in Josephson Junction Qubits Measured in a Three-Dimensional Circuit QED Architecture  

E-Print Network [OSTI]

Observation of High Coherence in Josephson Junction Qubits Measured in a Three-Dimensional Circuit December 2011) Superconducting quantum circuits based on Josephson junctions have made rapid progress the intrinsic coherence of Josephson junctions, and whether superconducting qubits can be adequately isolated

267

Comparison of the device physics principles of planar and radial p-n junction nanorod solar cells  

E-Print Network [OSTI]

Comparison of the device physics principles of planar and radial p-n junction nanorod solar cells been developed for radial p-n junction nanorod solar cells, in which densely packed nanorods, each improvements in efficiency relative to a conventional planar geometry p-n junction solar cell, provided

Atwater, Harry

268

Collective dynamics of Josephson fluxons in Bi2Sr2CaCu2O8d intrinsic junctions  

E-Print Network [OSTI]

in naturally stacked intrinsic Josephson junctions in Bi2Sr2- CaCu2O8þd single crystals were studied Keywords: Fluxon dynamics; Intrinsic Josephson junctions; Plasma excitation modes; Superradiant state 1 to high-frequency devices such as THz local oscilla- tors and mixers. Stacked long Josephson junctions

Lee, Hu-Jong

269

Scanning tunneling microscope tip as a positionable contact: Probing a Josephson-junction array at subkelvin temperatures  

E-Print Network [OSTI]

Scanning tunneling microscope tip as a positionable contact: Probing a Josephson-junction arrayK. The STM enables us to probe the structure, a Josephson-junction array, at various positions. Examples of such systems are two- dimensional electron gases and Josephson junction arrays.1

270

Three-dimensional Josephson-junction arrays: Static magnetic response R. De Luca and T. Di Matteo  

E-Print Network [OSTI]

Three-dimensional Josephson-junction arrays: Static magnetic response R. De Luca and T. Di Matteo Tampere, Finland Received 17 July 1997 In this work we present a simple three-dimensional Josephson-junction directions perpendicular to one cube side. S0163-1829 98 05502-7 I. INTRODUCTION The interest in Josephson-junction

Di Matteo, Tiziana

271

Microscopic model of critical current noise in Josephson-junction qubits: Subgap resonances and Andreev bound states  

E-Print Network [OSTI]

Microscopic model of critical current noise in Josephson-junction qubits: Subgap resonances in Josephson junctions based on individual trapping centers in the tunnel-barrier hybridized with electrons microresonators observed in Josephson-junction qubits R. W. Simmonds et al., Phys. Rev. Lett. 93, 077003 2004

von Delft, Jan

272

Nonlinear microwave impedance of short and long Josephson junctions Z. Zhai, Patanjali V. Parimi, and S. Sridhar  

E-Print Network [OSTI]

Nonlinear microwave impedance of short and long Josephson junctions Z. Zhai, Patanjali V. Parimi ) of the microwave ac impedance R iX of both short and long Josephson junctions is calculated under a variety and fabricated Josephson junctions in the high temperature superconductors. When a dc field (bdc) or current (idc

Sridhar, Srinivas

273

Rabi Oscillations in a Large Josephson-Junction Qubit John M. Martinis, S. Nam, and J. Aumentado*  

E-Print Network [OSTI]

Rabi Oscillations in a Large Josephson-Junction Qubit John M. Martinis, S. Nam, and J. Aumentado based on a large-area current-biased Josephson junction whose two lowest energy quantum levels are used. In this Letter, we present a new qubit designed around a 10 m scale Josephson junction in which the charging

Martinis, John M.

274

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, VOL. 13, NO. 2, JUNE 2003 989 Banishing Quasiparticles From Josephson-Junction  

E-Print Network [OSTI]

Quasiparticles From Josephson-Junction Qubits: Why and How to do it K. M. Lang, S. Nam, J. Aumentado, C. Urbina, and John M. Martinis, Member, IEEE Abstract--Current-biased Josephson junctions are prime candidates are effective and that the design of Josephson-junction qubits must consider the role of quasiparticles. Index

Lang, Kristine M.

275

SPECTRAL ANALYSIS OF A PHASE LOCKED LASER AT 891 GHz, AN APPLICATION OF JOSEPHSON JUNCTIONS IN THE FAR INFRARED  

E-Print Network [OSTI]

285 SPECTRAL ANALYSIS OF A PHASE LOCKED LASER AT 891 GHz, AN APPLICATION OF JOSEPHSON JUNCTIONS. Abstract. 2014 We have used a Josephson junction to investigate the spectral purity of an HCN laser which take advantage of the unique properties of the Josephson junction as a frequency multiplier and mixer

Paris-Sud XI, Université de

276

Coherence transition of small Josephson junctions coupled to a single-mode resonant cavity: Connection to the Dicke model  

E-Print Network [OSTI]

Coherence transition of small Josephson junctions coupled to a single-mode resonant cavity 5 February 2009 PACS: 74.50.+r 74.25.Nf 85.25.Cp 64.60.Cn Keywords: Josephson junctions properties of a collection of N small Josephson junctions coupled to a single-mode resonant electromagnetic

Stroud, David

277

Evidence for triplet superconductivity in Josephson junctions with barriers of the ferromagnetic Heusler alloy Cu2MnAl  

E-Print Network [OSTI]

Evidence for triplet superconductivity in Josephson junctions with barriers of the ferromagnetic have studied Josephson junctions with barriers prepared from the Heusler compound Cu2MnAl. In the as metal. Measurements on lateral Josephson junctions with half metallic CrO2 Ref. 7 and the rare

Martinis, John M.

278

Ischemic preconditioning enhances integrity of coronary endothelial tight junctions  

SciTech Connect (OSTI)

Highlights: Black-Right-Pointing-Pointer Cardiac tight junctions are present between coronary endothelial cells. Black-Right-Pointing-Pointer Ischemic preconditioning preserves the structural and functional integrity of tight junctions. Black-Right-Pointing-Pointer Myocardial edema is prevented in hearts subjected to ischemic preconditioning. Black-Right-Pointing-Pointer Ischemic preconditioning enhances translocation of ZO-2 from cytosol to cytoskeleton. -- Abstract: Ischemic preconditioning (IPC) is one of the most effective procedures known to protect hearts against ischemia/reperfusion (IR) injury. Tight junction (TJ) barriers occur between coronary endothelial cells. TJs provide barrier function to maintain the homeostasis of the inner environment of tissues. However, the effect of IPC on the structure and function of cardiac TJs remains unknown. We tested the hypothesis that myocardial IR injury ruptures the structure of TJs and impairs endothelial permeability whereas IPC preserves the structural and functional integrity of TJs in the blood-heart barrier. Langendorff hearts from C57BL/6J mice were prepared and perfused with Krebs-Henseleit buffer. Cardiac function, creatine kinase release, and myocardial edema were measured. Cardiac TJ function was evaluated by measuring Evans blue-conjugated albumin (EBA) content in the extravascular compartment of hearts. Expression and translocation of zonula occludens (ZO)-2 in IR and IPC hearts were detected with Western blot. A subset of hearts was processed for the observation of ultra-structure of cardiac TJs with transmission electron microscopy. There were clear TJs between coronary endothelial cells of mouse hearts. IR caused the collapse of TJs whereas IPC sustained the structure of TJs. IR increased extravascular EBA content in the heart and myocardial edema but decreased the expression of ZO-2 in the cytoskeleton. IPC maintained the structure of TJs. Cardiac EBA content and edema were reduced in IPC hearts. IPC enhanced the translocation of ZO-2 from cytosol to cytoskeleton. In conclusion, TJs occur in normal mouse heart. IPC preserves the integrity of TJ structure and function that are vulnerable to IR injury.

Li, Zhao [Department of Pharmaceutical Sciences, College of Pharmacy, South Dakota State University, Brookings, SD 57007 (United States)] [Department of Pharmaceutical Sciences, College of Pharmacy, South Dakota State University, Brookings, SD 57007 (United States); Jin, Zhu-Qiu, E-mail: zhu-qiu.jin@sdstate.edu [Department of Pharmaceutical Sciences, College of Pharmacy, South Dakota State University, Brookings, SD 57007 (United States)] [Department of Pharmaceutical Sciences, College of Pharmacy, South Dakota State University, Brookings, SD 57007 (United States)

2012-08-31T23:59:59.000Z

279

Noise Effects on birhythmic Josephson Junction coupled to a Resonator  

E-Print Network [OSTI]

We study the effect of noise on a Josephson junction that, coupled to a linear $RLC$ resonator, can oscillate at two frequencies. To establish the global stability of the attractors, we estimate the position of the separatrix, an essential information to establish the stability of the attractor for this multidimensional system, from the analysis of the mean first passage time. We find that the frequency locked to the resonator is most stable at low bias, and less stable at high bias, where the resonator exhibits the largest oscillations. The change in the birhythmic region is dramatic, for the effective barrier changes of an order of magnitude and the corresponding lifetime of about seven decades.

R. Yamapi; G. Filatrella

2014-06-24T23:59:59.000Z

280

Joule heating generated by spin current through Josephson junctions  

SciTech Connect (OSTI)

We theoretically study the spin-polarized current flowing through a Josephson junction (JJ) in a spin injection device. When the spin-polarized current is injected from a ferromagnet in a superconductor (SC), the charge current is carried by the superconducting condensate (Cooper pairs), while the spin-up and spin-down currents flow in equal magnitude but in the opposite direction in a SC, because of no quasiparticle charge current in the SC. This indicates that not only the Josephson current but also the spin current flow across JJ at zero bias voltage, thereby generating Joule heating by the spin current. The result provides a new method for detecting the spin current by measuring Joule heating at JJ. {copyright} 2001 American Institute of Physics.

Takahashi, S.; Yamashita, T.; Koyama, T.; Maekawa, S.; Imamura, H.

2001-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "junction greenfield grundy" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

False qubits?: Polarization of light and Josephson junction  

E-Print Network [OSTI]

We compare two physical systems: polarization degrees of freedom of a macroscopic light beam and the Josephson junction (JJ) in the "charge qubit regime". The first system obviously cannot carry genuine quantum information and we show that the maximal entanglement which could be encoded into polarization of two light beams scales like 1/(photon number). Two theories of JJ, one leading to the picture of "JJ-qubit" and the other based on the mean-field approach are discussed. The later, which seems to be more appropriate, implies that the JJ system is, essentially, mathematically equivalent to the polarization of a light beam with the number of photons replaced by the number of Cooper pairs. The existing experiments consistent with the "JJ-qubit" picture and the theoretical arguments supporting, on the contrary, the classical model are briefly discussed. The Franck-Hertz-type experiment is suggested as an ultimate test of the JJ nature.

Robert Alicki

2006-11-29T23:59:59.000Z

282

Nonequilibrium Transitions in Fully Frustrated Josephson Junction Arrays  

SciTech Connect (OSTI)

We study the effect of thermal fluctuations in a fully frustrated Josephson junction array driven by a current I larger than the apparent critical current I{sub c}(T) . We calculate numerically the behavior of the chiral order parameter of Z{sub 2} symmetry and the transverse helicity modulus [related to the U(1) symmetry] as a function of temperature. We find that the Z{sub 2} transition occurs at a temperature T{sub Z{sub 2}}(I) which is lower than the temperature T{sub U(1)}(I) for the U(1) transition. Both transitions could be observed experimentally from measurements of the longitudinal and transverse voltages.

Marconi, Veronica I.; Dominguez, Daniel

2001-07-02T23:59:59.000Z

283

Classical resonance interactions and Josephson junction in macroscopic quantum dynamics  

E-Print Network [OSTI]

It is shown that the classical dynamics of 1:1 resonance interaction between two identical linearly coupled Duffing oscillators is equivalent to the symmetric (non-biased) case of `macroscopic' quantum dynamics of two weakly coupled Bose-Einstein condensates. The analogy develops through the boson Josephson junction equations, however, reduced to a single conservative energy partition (EP) oscillator. The derived oscillator is solvable in quadratures, furthermore it admits asymptotic solution in terms of elementary functions after transition to the action-angle variables. Energy partition and coherency indexes are introduced to provide a complete characterization of the system dynamic states through the state variables of the EP oscillator. In particular, nonlinear normal and local mode dynamics of the original system associate with equilibrium points of such oscillator. Additional equilibrium points - the local modes - may occur on high energy level as a result of the symmetry breaking bifurcation, which is ...

Pilipchuk, V N

2012-01-01T23:59:59.000Z

284

Mean Field Theory of Josephson Junction Arrays with Charge Frustration  

E-Print Network [OSTI]

Using the path integral approach, we provide an explicit derivation of the equation for the phase boundary for quantum Josephson junction arrays with offset charges and non-diagonal capacitance matrix. For the model with nearest neighbor capacitance matrix and uniform offset charge $q/2e=1/2$, we determine, in the low critical temperature expansion, the most relevant contributions to the equation for the phase boundary. We explicitly construct the charge distributions on the lattice corresponding to the lowest energies. We find a reentrant behavior even with a short ranged interaction. A merit of the path integral approach is that it allows to provide an elegant derivation of the Ginzburg-Landau free energy for a general model with charge frustration and non-diagonal capacitance matrix. The partition function factorizes as a product of a topological term, depending only on a set of integers, and a non-topological one, which is explicitly evaluated.

G. Grignani; A. Mattoni; P. Sodano; A. Trombettoni

1999-02-12T23:59:59.000Z

285

A bosonic Josephson junction controlled by a single trapped ion  

E-Print Network [OSTI]

We theoretically investigate the properties of a double-well bosonic Josephson junction coupled to a single trapped ion. We find that the coupling between the wells can be controlled by the internal state of the ion, which can be used for studying mesoscopic entanglement between the two systems and to measure their interaction with high precision. As a particular example we consider a small $^{87}$Rb Bose-Einstein condensate controlled by a single $^{171}$Yb$^+$ ion. We calculate interwell coupling rates reaching 100 Hz, while the state dependence amounts to 10s of Hz for plausible values of the currently unknown s-wave scattering length between the atom and the ion. The system could be realized in an experiment by combining trapped ions with optical dipole traps for cold atoms or in a combined atom-ion micro trap, where both approaches are within reach using current technology.

Gerritsma, R; Doerk, H; Idziaszek, Z; Calarco, T; Schmidt-Kaler, F

2011-01-01T23:59:59.000Z

286

Dissipative Nonlinear Josephson Junction of Optical Soliton and Surface Plasmon  

E-Print Network [OSTI]

We examine the dynamics of a dissipative photonic Josephson junction formed by the weak coupling of an optical soliton in a nonlinear dielectric waveguide and a co-propagating surface plasmon along a parallel metal surface with a linear dielectric spacer. We employ a heuristic model with a coupling function that depends on the soliton amplitude, and consider two phenomenological dissipation mechanisms separately: angular velocity dissipation and population imbalance dissipation. In the former dissipation mechanism, the system exhibits phase-slip phenomenon where the odd-\\pi phase modes decay into even-\\pi phase modes. The latter damping mechanism sculptures the phase-space significantly by introducing complex features, among which Hopf type bifurcations are notable. We show that some of the bifurcation points expand to stable limit cycles for certain regimes of the model parameters.

Ek?io?lu, Yasa; Gven, Kaan

2012-01-01T23:59:59.000Z

287

A bosonic Josephson junction controlled by a single trapped ion  

E-Print Network [OSTI]

We theoretically investigate the properties of a double-well bosonic Josephson junction coupled to a single trapped ion. We find that the coupling between the wells can be controlled by the internal state of the ion, which can be used for studying mesoscopic entanglement between the two systems and to measure their interaction with high precision. As a particular example we consider a single $^{87}$Rb atom and a small Bose-Einstein condensate controlled by a single $^{171}$Yb$^+$ ion. We calculate inter-well coupling rates reaching hundreds of Hz, while the state dependence amounts to tens of Hz for plausible values of the currently unknown s-wave scattering length between the atom and the ion. The analysis shows that it is possible to induce either the self-trapping or the tunneling regime, depending on the internal state of the ion. This enables the generation of large scale ion-atomic wavepacket entanglement within current technology.

R. Gerritsma; A. Negretti; H. Doerk; Z. Idziaszek; T. Calarco; F. Schmidt-Kaler

2012-07-25T23:59:59.000Z

288

Thermal spin-transfer torque in magnetic tunnel junctions (invited)  

SciTech Connect (OSTI)

The thermal spin-transfer torque (TSTT) is an effect to switch the magnetic free layer in a magnetic tunnel junction by a temperature gradient only. We present ab initio calculations of the TSTT. In particular, we discuss the influence of magnetic layer composition by considering Fe{sub x}Co{sub 1x} alloys. Further, we compare the TSTT to the bias voltage driven STT and discuss the requirements for a possible thermal switching. For example, only for very thin barriers of 3 monolayers MgO, a thermal switching is imaginable. However, even for such a thin barrier, the TSTT is still too small for switching at the moment and further optimization is needed. In particular, the TSTT strongly depends on the composition of the ferromagnetic layer. In our current study, it turns out that at the chosen thickness of the ferromagnetic layer, pure Fe gives the highest thermal spin-transfer torque.

Heiliger, Christian, E-mail: christian.heiliger@physik.uni-giessen.de; Franz, C.; Czerner, Michael [I. Physikalisches Institut, Justus Liebig University, Giessen (Germany)

2014-05-07T23:59:59.000Z

289

Proximity effect and hot-electron diffusion in Ag/Al{sub 2}O{sub 3}/Al tunnel junctions  

SciTech Connect (OSTI)

We have fabricated Ag/Al{sub 2}O{sub 3}/Al tunnel junctions on Si substrates using a new process. This process was developed to fabricate superconducting tunnel junctions (STJs) on the surface of a superconductor. These junctions allow us to study the proximity effect of a superconducting Al film on a normal metal trapping layer. In addition, these devices allow us to measure the hot-electron diffusion constant using a single junction. Lastly these devices will help us optimize the design and fabrication of tunnel junctions on the surface of high-Z, ultra-pure superconducting crystals. 5 refs., 8 figs.

Netel, H., Jochum, J., Labov, S.E., Mears, C.A., Frank, M. [Physics and Space Technology Directorate, Lawrence Livermore National Lab., CA (United States); Chow, D., Lindeman, M.A., Hiller, L.J. [California Univ., Davis, CA (United States). Dept. of Applied Science

1997-02-18T23:59:59.000Z

290

Improved method of preparing p-i-n junctions in amorphous silicon semiconductors  

DOE Patents [OSTI]

A method of preparing p/sup +/-i-n/sup +/ junctions for amorphous silicon semiconductors includes depositing amorphous silicon on a thin layer of trivalent material, such as aluminum, indium, or gallium at a temperature in the range of 200/sup 0/C to 250/sup 0/C. At this temperature, the layer of trivalent material diffuses into the amorphous silicon to form a graded p/sup +/-i junction. A layer of n-type doped material is then deposited onto the intrinsic amorphous silicon layer in a conventional manner to finish forming the p/sup +/-i-n/sup +/ junction.

Madan, A.

1984-12-10T23:59:59.000Z

291

Synchronization of a Josephson junction array in terms of global variables  

E-Print Network [OSTI]

We consider an array of Josephson junctions with a common LCR-load. Application of the Watanabe-Strogatz approach [Physica D, v. 74, p. 197 (1994)] allows us to formulate the dynamics of the array via the global variables only. For identical junctions this is a finite set of equations, analysis of which reveals the regions of bistability of the synchronous and asynchronous states. For disordered arrays with distributed parameters of the junctions, the problem is formulated as an integro-differential equation for the global variables, here stability of the asynchronous states and the properties of the transition synchrony-asynchrony are established numerically.

Vladimir Vlasov; Arkady Pikovsky

2013-04-08T23:59:59.000Z

292

Magnetic vortices in a distributed Josephson junction with electrodes of finite thickness  

SciTech Connect (OSTI)

A distributed Josephson junction with electrodes of finite thickness is considered in the case of high critical current density when the Josephson penetration depth {lambda}{sub {ital j}} is less than the London depth {lambda}{sub {ital L}}. A nonlinear nonlocal equation for steady-state distributions of phase difference {ital cphi} across the junction is derived. In the asymptotical case of thin electrodes an exact nonlinear solution for this equation which corresponds to an isolated at-rest Josephson vortex is found. A numerical investigation of the equation derived is carried out and some static and dynamic characteristics of vortices in such a Josephson junction are represented.

Alfimov, G.L.; Popkov, A.F. [F. V. Lukin`s Research Institute of Physicsl Problems, Zelenograd, Moscow, 103460 (Russian Federation)] [F. V. Lukin`s Research Institute of Physicsl Problems, Zelenograd, Moscow, 103460 (Russian Federation)

1995-08-01T23:59:59.000Z

293

A Controllable Interaction between Two-Level Systems inside a Josephson Junction  

E-Print Network [OSTI]

Two-level system fluctuators (TLS's) in the tunnel barrier of a Josephson junction have recently been demonstrated to cause novel energy splittings in spectroscopic measurements of superconducting phase qubits. With their strong coupling to the Josephson junction and relatively long decoherence times, TLS's can be considered as potential qubits and demonstrate coherent quantum effects. Here, we study the effective interaction between the TLS qubits that is mediated by a Josephson junction resonator driven by an external microwave source. This effective interaction can enable controlled quantum logic gates between the TLS's. Our study can be extended to other superconducting resonators coupling with TLS's.

L. Tian; K. Jacobs

2009-03-23T23:59:59.000Z

294

Dissipative Dynamics of a Josephson Junction In the Bose-Gases  

E-Print Network [OSTI]

The dissipative dynamics of a Josephson junction in the Bose-gases is considered within the framework of the model of a tunneling Hamiltonian. The effective action which describes the dynamics of the phase difference across the junction is derived using functional integration method. The dynamic equation obtained for the phase difference across the junction is analyzed for the finite temperatures in the low frequency limit involving the radiation terms. The asymmetric case of the Bose-gases with the different order parameters is calculated as well.

R. A. Barankov; S. N. Burmistrov

2003-01-09T23:59:59.000Z

295

Tunneling in all-high-Tc edge junctions with deposited barriers  

Science Journals Connector (OSTI)

All-high-Tc-material edge junctions consisting of laser-ablated Y-Ba-Cu-O electrodes and an in situ rf-sputter-deposited MgO barrier have been fabricated whose I-V characteristics show tunneling-related effects. These include a junction resistance with an exponential dependence on the nominal-barrier thickness, gaplike structure observed in the conductance curves, and Josephson effects. These properties are very sensitive to the choice of materials-processsing method for the junction interfaces.

R. B. Laibowitz, R. P. Robertazzi, R. H. Koch, A. Kleinsasser, J. R. Kirtley, J. M. Viggiano, R. L. Sandstrom, and W. J. Gallagher

1992-12-01T23:59:59.000Z

296

IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS--II: EXPRESS BRIEFS, VOL. 53, NO. 10, OCTOBER 2006 1031 Spiking and Bursting in Josephson Junction  

E-Print Network [OSTI]

Spiking and Bursting in Josephson Junction Syamal Kumar Dana, Member, IEEE, Dipendra Chandra Sengupta of the resistive­capacitive­inductive shunted Josephson junction model. Regular spiking, intrinsic bursting--Bursting, Josephson junction, neuron, spiking. I. INTRODUCTION THE DYNAMICS of the Josephson junction under an ex

297

Monitoring of the Airport Calibration Pads at Walker Field, Grand Junction,  

Broader source: Energy.gov (indexed) [DOE]

Monitoring of the Airport Calibration Pads at Walker Field, Grand Monitoring of the Airport Calibration Pads at Walker Field, Grand Junction, Colorado, for Long-Term Radiation Variations (August 1978) Monitoring of the Airport Calibration Pads at Walker Field, Grand Junction, Colorado, for Long-Term Radiation Variations (August 1978) Monitoring of the Airport Calibration Pads at Walker Field, Grand Junction, Colorado, for Long-Term Radiation Variations (August 1978) Monitoring of the Airport Calibration Pads at Walker Field, Grand Junction, Colorado, for Long-Term Radiation Variations (August 1978) More Documents & Publications Field Calibration Facilities for Environmental Measurement of Radium, Thorium, and Potassium (October 2013) Long-Term Surveillance Operations and Maintenance Fiscal Year 2013 Year-End Summary Report

298

Photo of the Week: An Express Train to Crescent Junction | Department of  

Broader source: Energy.gov (indexed) [DOE]

An Express Train to Crescent Junction An Express Train to Crescent Junction Photo of the Week: An Express Train to Crescent Junction January 4, 2013 - 1:53pm Addthis In the 1950s, one of the largest uranium deposits in the U.S. was found near Moab, Utah. The Department of Energy began cleaning up the uranium mill tailings from the Moab Site in April 2009, using steel containers to transport more than five million tons of tailings for safe disposal near Crescent Junction, Utah. In this May 2012 photo, one of the trains is shown on the Union Pacific Railroad in Utah, passing a butte capped by a familiar southwest U.S. rock formation known as Navajo Sandstone. | Photo courtesy of the Department of Energy. In the 1950s, one of the largest uranium deposits in the U.S. was found near Moab, Utah. The Department of Energy began cleaning up the uranium

299

Novel Materials and Structures for Super High Efficiency Multi-Junction Solar Cells  

Science Journals Connector (OSTI)

IIIV compound multi-junction solar cells have great potential for space and terrestrial applications because they have high efficiency potential of more than 50% and superior ... bottom cell, we have demonstrate...

Masafumi Yamaguchi; Hidetoshi Suzuki

2009-01-01T23:59:59.000Z

300

Improved synthesis of carbon nanotubes with junctions and of single-walled carbon nanotubes  

Science Journals Connector (OSTI)

Pyrolysis of thiophene over nickel nanoparticles dispersed on silica is shown to yield Y-junction carbon nanotubes with smaller diameters than those obtained by ... pyrolysis of organometallic-hydrocarbon mixture...

F. L. Deepak; A. Govindaraj; C. N. R. Rao

2006-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "junction greenfield grundy" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Systematic oversteepening in longitudinal profiles of mixed bedrock-alluvial channels at tributary junctions : Appalachians, Virginia  

E-Print Network [OSTI]

Certain mixed bedrock/alluvial channels located in the Valley and Ridge province of the Appalachians in Virginia were identified as having a pattern of systematic oversteepening of channel gradients at tributary junctions. ...

Windhorst, Leah M. (Leah Marie), 1981-

2004-01-01T23:59:59.000Z

302

Design of a scanning Josephson junction microscope for submicron-resolution magnetic imaging  

SciTech Connect (OSTI)

We describe a magnetic field scanning instrument designed to extend the spatial resolution of scanning superconducting quantum interference device microscopy into the submicron regime. This instrument, the scanning Josephson junction microscope, scans a single Josephson junction across the surface of a sample, detecting the local magnetic field by the modulation of the junction critical current. By using a submicron junction and a scanning tunneling microscope feedback system to maintain close proximity to the surface, magnetic field sensitivity of 10 {mu}G with a spatial resolution of 0.3 {mu}m should be attainable, opening up new opportunities for imaging vortex configurations and core structure in superconductors and magnetic domains in magnetic materials. {copyright} {ital 1999 American Institute of Physics.}

Plourde, B.L.; Van Harlingen, D.J. [Department of Physics, Science and Technology Center for Superconductivity, and Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 (United States)] [Department of Physics, Science and Technology Center for Superconductivity, and Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 (United States)

1999-11-01T23:59:59.000Z

303

Eigenstates of a Small Josephson Junction Coupled to a Resonant Cavity  

E-Print Network [OSTI]

We carry out a quantum-mechanical analysis of a small Josephson junction coupled to a single-mode resonant cavity. We find that the eigenstates of the combined junction-cavity system are strongly entangled only when the gate voltage applied at one of the superconducting islands is tuned to certain special values. One such value corresponds to the resonant absorption of a single photon by Cooper pairs in the junction. Another special value corresponds to a {\\em two-photon} absorption process. Near the single-photon resonant absorption, the system is accurately described by a simplified model in which only the lowest two levels of the Josephson junction are retained in the Hamiltonian matrix. We noticed that this approximation does not work very well as the number of photons in the resonator increases. Our system shows also the phenomenon of ``collapse and revival'' under suitable initial conditions, and our full numerical solution agrees with the two level approximation result.

W. A. Al-Saidi; D. Stroud

2001-10-05T23:59:59.000Z

304

Temperature study of Zero Bias Features using self-assembling tunnel junctions  

E-Print Network [OSTI]

The significant reduction in the conductance of a tunneling system near zero bias voltage is termed the Zero Bias Feature (ZBF). A He cryostat has been modified to incorporate a Self-Assembling Tunnel Junction (SATJ), capable of performing...

Savitski, Stephen Ronald

2012-06-07T23:59:59.000Z

305

The fabrication of high quality silicon junction detectors by low energy ion implantation  

Science Journals Connector (OSTI)

High quality silicon junction detectors have been made by implantation of boron and phosphorus ions into silicon wafers. Resolutions of 20 keV for Po ?-particles were obtained.

S. Kalbitzer; R. Bader; H. Herzer; K. Bethge

1967-01-01T23:59:59.000Z

306

E-Print Network 3.0 - alkanedithiol single-molecule junctions...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

electrodes to form a metal-molecule- metal junction. Alkanedithiols with 5, 6, 8 and 9 carbon atoms were... mode). As there are no clear multiples of the GA and GB, GC seems to...

307

Method And Apparatus For Reducing Sample Dispersion In Turns And Junctions Of Micro-Channel Systems  

DOE Patents [OSTI]

What is disclosed pertains to improvement in the performance of microchannel devices by providing turns, wyes, tees, and other junctions that produce little dispersion of a sample as it traverses the turn or junction. The reduced dispersion results from contraction and expansion regions that reduce the cross-sectional area over some portion of the turn or junction. By carefully designing the geometries of these regions, sample dispersion in turns and junctions is reduced to levels comparable to the effects of ordinary diffusion. The low dispersion features are particularly suited for microfluidic devices and systems using either electromotive force, pressure, or combinations thereof as the principle of fluid transport. Such microfluidic devices and systems are useful for separation of components, sample transport, reaction, mixing, dilution or synthesis, or combinations thereof.

Griffiths, Stewart K. (Danville, CA), Nilson, Robert H. (Cardiff-by-the-Sea, CA)

2004-05-11T23:59:59.000Z

308

3-D Nano-mechanics of an Erythrocyte Junctional Comples in Equibiaxial and Anisotropic Deformations  

E-Print Network [OSTI]

3-D Nano-mechanics of an Erythrocyte Junctional Complex inCA, 92093, USA Running title: Nano-mechanics of Erythrocytefashion. This newly predicted nano-mechanics in response to

Vera, Carlos; Skelton, Robert; Sung, Amy

2005-01-01T23:59:59.000Z

309

Temporal stability of Y Ba Cu O nano Josephson junctions from ion irradiation  

E-Print Network [OSTI]

stability of Y-Ba-Cu-O nano Josephson junctions from ionion irradiation through a nano-scale implant mask fabricateda two-dimensional array, Nano Letters, 9, pp. 3581-3585, [

Cybart, Shane A.

2014-01-01T23:59:59.000Z

310

Resonant escape over an oscillating barrier in underdamped Josephson tunnel junctions  

E-Print Network [OSTI]

The escape from a metastable state over an oscillating barrier of an underdamped Josephson tunnel junction has been experimentally investigated with oscillation frequency well separated from the plasma frequency of the ...

Han, Siyuan; Yu, Yang

2003-09-01T23:59:59.000Z

311

Ab initio Electronic Structure Calculations of Metal-Vacuum-Metal Junctions in Nonequilibrium Situations  

Science Journals Connector (OSTI)

Electronic structures of bielectrode junctions under external bias voltages were recently solved numerically on an ab initio basis using nonequilibrium Green-function methods in combination with the density-funct...

Karel Carva; Ilja Turek

2004-12-01T23:59:59.000Z

312

Electronic structures at Magnetic Tunnel Junction interfaces: EELS experiments and FEFF calculations  

Science Journals Connector (OSTI)

Electron transfer between the electrodes in a Magnetic Tunnel Junction (MTJ) is spin-dependent and directly related to the relative orientation of the magnetization of the two ferromagnetic layers on each side...

K. March; D. Imhoff; G. Krill; C. Colliex

2008-01-01T23:59:59.000Z

313

Mechanisms underlying rapid activity-dependent structural plasticity at Drosophila neuromuscular junctions  

E-Print Network [OSTI]

The Drosophila neuromuscular junction (NMJ) is capable of rapidly budding new presynaptic varicosities over the course of minutes in response to elevated neuronal activity. Using live imaging of synaptic growth, we ...

Piccioli, Zachary D. (Zachary David)

2014-01-01T23:59:59.000Z

314

0.7-eV GaInAs Junction for a GaInP/GaAs/GaInAs(1eV)/GaInAs(0.7eV) Four-Junction Solar Cell  

SciTech Connect (OSTI)

We discuss recent developments in III-V multijunction solar cells, focusing on adding a fourth junction to the Ga{sub 0.5}In{sub 0.5} P/GaAs/Ga{sub 0.75}In{sub 0.25}As inverted three-junction cell. This cell, grown inverted on GaAs so that the lattice-mismatched Ga{sub 0.75}In{sub 0.25}As third junction is the last one grown, has demonstrated 38% efficiency, and 40% is likely in the near future. To achieve still further gains, a lower-bandgap Ga{sub x}In{sub 1-x}As fourth junction could be added to the three-junction structure for a four-junction cell whose efficiency could exceed 45% under concentration. Here, we present the initial development of the Ga{sub x}In{sub 1-x}As fourth junction. Junctions of various bandgaps ranging from 0.88 to 0.73 eV were grown, in order to study the effect of the different amounts of lattice mismatch. At a bandgap of 0.88 eV, junctions were obtained with very encouraging {approx}80% quantum efficiency, 57% fill factor, and 0.36 eV open-circuit voltage. The device performance degrades with decreasing bandgap (i.e., increasing lattice mismatch). We model the four-junction device efficiency vs. fourth junction bandgap to show that an 0.7-eV fourth-junction bandgap, while optimal if it could be achieved in practice, is not necessary; an 0.9-eV bandgap would still permit significant gains in multijunction cell efficiency while being easier to achieve than the lower-bandgap junction.

Friedman, D. J.; Geisz, J. F.; Norman, A. G.; Wanlass, M. W.; Kurtz, S. R.

2006-01-01T23:59:59.000Z

315

CFD validation in OECD/NEA t-junction benchmark.  

SciTech Connect (OSTI)

When streams of rapidly moving flow merge in a T-junction, the potential arises for large oscillations at the scale of the diameter, D, with a period scaling as O(D/U), where U is the characteristic flow velocity. If the streams are of different temperatures, the oscillations result in experimental fluctuations (thermal striping) at the pipe wall in the outlet branch that can accelerate thermal-mechanical fatigue and ultimately cause pipe failure. The importance of this phenomenon has prompted the nuclear energy modeling and simulation community to establish a benchmark to test the ability of computational fluid dynamics (CFD) codes to predict thermal striping. The benchmark is based on thermal and velocity data measured in an experiment designed specifically for this purpose. Thermal striping is intrinsically unsteady and hence not accessible to steady state simulation approaches such as steady state Reynolds-averaged Navier-Stokes (RANS) models.1 Consequently, one must consider either unsteady RANS or large eddy simulation (LES). This report compares the results for three LES codes: Nek5000, developed at Argonne National Laboratory (USA), and Cabaret and Conv3D, developed at the Moscow Institute of Nuclear Energy Safety at (IBRAE) in Russia. Nek5000 is based on the spectral element method (SEM), which is a high-order weighted residual technique that combines the geometric flexibility of the finite element method (FEM) with the tensor-product efficiencies of spectral methods. Cabaret is a 'compact accurately boundary-adjusting high-resolution technique' for fluid dynamics simulation. The method is second-order accurate on nonuniform grids in space and time, and has a small dispersion error and computational stencil defined within one space-time cell. The scheme is equipped with a conservative nonlinear correction procedure based on the maximum principle. CONV3D is based on the immersed boundary method and is validated on a wide set of the experimental and benchmark data. The numerical scheme has a very small scheme diffusion and is the second and the first order accurate in space and time, correspondingly. We compare and contrast simulation results for three computational fluid dynamics codes CABARET, Conv3D, and Nek5000 for the T-junction thermal striping problem that was the focus of a recent OECD/NEA blind benchmark. The corresponding codes utilize finite-difference implicit large eddy simulation (ILES), finite-volume LES on fully staggered grids, and an LES spectral element method (SEM), respectively. The simulations results are in a good agreement with experimenatl data. We present results from a study of sensitivity to computational mesh and time integration interval, and discuss the next steps in the simulation of this problem.

Obabko, A. V.; Fischer, P. F.; Tautges, T. J.; Karabasov, S.; Goloviznin, V. M.; Zaytsev, M. A.; Chudanov, V. V.; Pervichko, V. A.; Aksenova, A. E. (Mathematics and Computer Science); (Cambridge Univ.); (Moscow Institute of Nuclar Energy Safety)

2011-08-23T23:59:59.000Z

316

DOE/Grand Junction Office Bluewater LTSP July 1997 Doc. No. S00012AA, Page iii  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

DOE/Grand Junction Office Bluewater LTSP DOE/Grand Junction Office Bluewater LTSP July 1997 Doc. No. S00012AA, Page iii Contents Page 1.0 Introduction .........................................................................................................................................1 1.1 Purpose ................................................................................................................................1 1.2 Legal and Regulatory Requirements .................................................................................. 1 1.3 Role of the Department of Energy ..................................................................................... 2 1.4 Disposal of Mill Waste Containing Polychlorinated Biphenyls ........................................ 2 2.0 Bluewater Disposal Site .....................................................................................................................

317

Quantum Robust Stability of a Small Josephson Junction in a Resonant Cavity  

E-Print Network [OSTI]

This paper applies recent results on the robust stability of nonlinear quantum systems to the case of a Josephson junction in a resonant cavity. The Josephson junction is characterized by a Hamiltonian operator which contains a non-quadratic term involving a cosine function. This leads to a sector bounded nonlinearity which enables the previously developed theory to be applied to this system in order to analyze its stability.

Ian R. Petersen

2013-01-09T23:59:59.000Z

318

Studies of chaos and thermal noise in a driven Josephson junction using an electronic analog  

SciTech Connect (OSTI)

Using an electronic analog of a resistively shunted driven Josephson junction, the authors have demonstrated a number of effects, including the appearance of a devil's staircase in the current-voltage characteristic, the onset of chaos, and the effect of noise on these phenomena. The authors stress that the analog is simple, but models the junction behavior with a high degree of accuracy and detail.

Pegrum, C.M.; Gurney, W.S.C.; Nisbet, R.M.

1989-03-01T23:59:59.000Z

319

High temperature superconductor step-edge Josephson junctions using Ti-Ca-Ba-Cu-O  

SciTech Connect (OSTI)

A process is disclosed for formulating non-hysteretic and hysteretic Josephson junctions using HTS materials which results in junctions having the ability to operate at high temperatures while maintaining high uniformity and quality. The non-hysteretic Josephson junction is formed by step-etching a LaAlO[sub 3] crystal substrate and then depositing a thin film of TlCaBaCuO on the substrate, covering the step, and forming a grain boundary at the step and a subsequent Josephson junction. Once the non-hysteretic junction is formed the next step to form the hysteretic Josephson junction is to add capacitance to the system. In the current embodiment, this is accomplished by adding a thin dielectric layer, LaA1O[sub 3], followed by a cap layer of a normal metal where the cap layer is formed by first depositing a thin layer of titanium (Ti) followed by a layer of gold (Au). The dielectric layer and the normal metal cap are patterned to the desired geometry. 8 figs.

Ginley, D.S.; Hietala, V.M.; Hohenwarter, G.K.G.; Martens, J.S.; Plut, T.A.; Tigges, C.P.; Vawter, G.A.; Zipperian, T.E.

1994-10-25T23:59:59.000Z

320

High temperature superconductor step-edge Josephson junctions using Ti-Ca-Ba-Cu-O  

SciTech Connect (OSTI)

A process for formulating non-hysteretic and hysteretic Josephson junctions using HTS materials which results in junctions having the ability to operate at high temperatures while maintaining high uniformity and quality. The non-hysteretic Josephson junction is formed by step-etching a LaAlO.sub.3 crystal substrate and then depositing a thin film of TlCaBaCuO on the substrate, covering the step, and forming a grain boundary at the step and a subsequent Josephson junction. Once the non-hysteretic junction is formed the next step to form the hysteretic Josephson junction is to add capacitance to the system. In the current embodiment, this is accomplished by adding a thin dielectric layer, LaA1O.sub.3, followed by a cap layer of a normal metal where the cap layer is formed by first depositing a thin layer of titanium (Ti) followed by a layer of gold (Au). The dielectric layer and the normal metal cap are patterned to the desired geometry.

Ginley, David S. (Evergreen, CO); Hietala, Vincent M. (Placitas, NM); Hohenwarter, Gert K. G. (Madison, WI); Martens, Jon S. (Sunnyvale, CA); Plut, Thomas A. (Albuquerque, NM); Tigges, Chris P. (Albuquerque, NM); Vawter, Gregory A. (Albuquerque, NM); Zipperian, Thomas E. (Albuquerque, NM)

1994-10-25T23:59:59.000Z

Note: This page contains sample records for the topic "junction greenfield grundy" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

Single Molecule Junctions: A Laboratory for Chemistry, Mechanics and Bond Rupture  

SciTech Connect (OSTI)

Simultaneous measurement [1] of junction conductance and sustained force in single molecule junctions bridging metal electrodes provides a powerful tool in the quantitative study of the character of molecule-metal bonds. In this talk I will discuss three topics. First, I will describe chemical trends in link bond strength based on experiments and Density Functional Theory based calculations. Second, I will focus on the specific case of pyridine-linked junctions. Bond rupture from the high conductance junction structure shows a requires a force that exceeds the rupture force of gold point contacts and clearly indicates the role of additional forces, beyond the specific N-Au donor acceptor bond. DFT-D2 calculations with empirical addition of dispersion interactions illustrates the interplay between the donor-acceptor bonding and the non-specific van der Waals interactions between the pyridine rings and Au asperities. Third, I will describe recent efforts to characterize the diversity of junction structures realized in break-junction experiments with suitable models for the potential surfaces that are observed. [1] Venkataraman Group, Columbia University.

Hybertsen M. S.

2013-07-08T23:59:59.000Z

322

The Chern-Simons term in a dual Josephson junction  

E-Print Network [OSTI]

A dual Josephson junction corresponding to a (2+1)-dimensional non-superconducting layer sandwiched between two (3+1)-dimensional dual superconducting regions constitutes a model of localization of a U(1) gauge field within the layer. Monopole tunneling currents flow from one dual superconducting region to another due to a phase difference between the wave functions of the monopole condensate below and above the non-superconducting layer. These magnetic currents appear within the (2+1)-dimensional layer as a gas of magnetic instanton events and a weak electric charge confinement is expected to take place at very long distances within the layer. In the present work, we consider what happens when one introduces fermions in this physical scenario. Due to the dual Meissner effect featured in the dual superconducting bulk, it is argued that unconfined fermions would be localized within the (2+1)-dimensional layer, where their quantum fluctuations radiatively induce a Chern-Simons term, which is known to destroy th...

Grigorio, L S; Rougemont, R; Wotzasek, C; Zarro, C A D

2013-01-01T23:59:59.000Z

323

The Chern-Simons term in a dual Josephson junction  

E-Print Network [OSTI]

A dual Josephson junction corresponding to a (2+1)-dimensional non-superconducting layer sandwiched between two (3+1)-dimensional dual superconducting regions constitutes a model of localization of a U(1) gauge field within the layer. Monopole tunneling currents flow from one dual superconducting region to another due to a phase difference between the wave functions of the monopole condensate below and above the non-superconducting layer when there is an electromagnetic field within the layer. These magnetic currents appear within the (2+1)-dimensional layer as a gas of magnetic instanton events and a weak electric charge confinement is expected to take place at very long distances within the layer. In the present work, we consider what happens when one introduces fermions in this physical scenario. Due to the dual Meissner effect featured in the dual superconducting bulk, it is argued that unconfined fermions would be localized within the (2+1)-dimensional layer, where their quantum fluctuations radiatively induce a Chern-Simons term, which is known to destroy the electric charge confinement and to promote the confinement of the magnetic instantons.

L. S. Grigorio; M. S. Guimaraes; R. Rougemont; C. Wotzasek; C. A. D. Zarro

2013-08-27T23:59:59.000Z

324

Spin Josephson effect in topological superconductor-ferromagnet junction  

SciTech Connect (OSTI)

The composite topological superconductor (TS), made of one-dimensional spin-orbit coupled nanowire with proximity-induced s-wave superconductivity, is not a pure p-wave superconductor but still has a suppressed s-wave pairing. We propose to probe the spin texture of the p-wave pairing in this composite TS by examining possible spin supercurrents in an unbiased TS/ferromagnet junction. It is found that both the exchange-coupling induced and spin-flip reflection induced spin currents exist in the setup and survive even in the topological phase. We showed that besides the nontrivial p-wave pairing state accounting for Majorana Fermions, there shall be a trivial p-wave pairing state that contributes to spin supercurrent. The trivial p-wave pairing state is diagnosed from the mixing effect between the suppressed s-wave pairing and the topologically nontrivial p-wave pairing. The d vector of the TS is proved not to be rigorously perpendicular to the spin projection of p-wave pairings. Our findings are also confirmed by the Kitaev's p-wave model with a nonzero s-wave pairing.

Ren, C. D.; Wang, J., E-mail: jwang@seu.edu.cn [Department of Physics, Southeast University, Nanjing 210096 (China)

2014-03-21T23:59:59.000Z

325

Spin torque in magnetic tunnel junctions with asymmetric barriers  

Science Journals Connector (OSTI)

We derive expressions for both parallel and perpendicular components of spin transfer torque (STT) in magnetic tunnel junctions (MTJs), which have several important advantages over the currently available expressions: First they are derived in a more realistic approximation, resulting in excellent agreement with exact results even in the presence of resonant tunneling. Second, we show that they can be expressed in terms of the scattering matrix elements, which gives them a clear physical interpretation. Third, they are given entirely in terms of collinear quantities, which are readily available in existing transport codes. We use these expressions to investigate STT behavior in MTJs with asymmetric barriers at finite bias. The results show that lowering the barrier height in the bulk does not qualitatively change the behavior of STT. The absolute STT increases on account of the overall increase of the barrier transparency; however, the STT efficiency remains in the same range. At the same time, modifications of the interfaces can qualitatively change STT behavior. Thus, interface engineering can be used to control the bias dependence of STT and optimize the performance of STT-based devices.

Alan Kalitsov; Whasington Silvestre; Mairbek Chshiev; Julian P. Velev

2013-09-30T23:59:59.000Z

326

Properties of planar Nb/{alpha}-Si/Nb Josephson junctions with various degrees of doping of the {alpha}-Si layer  

SciTech Connect (OSTI)

The properties of Nb/{alpha}-Si/Nb planar Josephson junctions with various degrees of doping of the amorphous silicon layer are experimentally studied. Tungsten is used as a doping impurity. The properties of the Josephson junctions are shown to change substantially when the degree of doping of the {alpha}-Si layer changes: a current transport mechanism and the shape of the current-voltage characteristic of the junctions change. Josephson junctions with SNS-type conduction are formed in the case of a fully degenerate {alpha}-Si layer. The properties of such junctions are described by a classical resistive model. Josephson junctions with a resonance mechanism of current transport through impurity centers are formed at a lower degree of doping of the {alpha}-Si layer. The high-frequency properties of such junctions are shown to change. The experimental results demonstrate that these junctions are close to SINIS-type Josephson junctions.

Gudkov, A. L., E-mail: gudkov@niifp.ru [Lukin Scientific Research Institute of Physical Problems, ZAO Kompelst (Russian Federation); Kupriyanov, M. Yu. [Moscow State University, Skobeltsyn Institute of Nuclear Physics (Russian Federation); Samus', A. N. [Lukin Scientific Research Institute of Physical Problems, ZAO Kompelst (Russian Federation)

2012-05-15T23:59:59.000Z

327

Investigation of Junction Properties of CdS/CdTe Solar Cells and their Correlation to Device Properties (Presentation)  

SciTech Connect (OSTI)

The objective of the Junction Studies are: (1) understand the nature of the junction in the CdTe/CdS device; (2) correlate the device fabrication parameters to the junction formation; and (3) develop a self consistent device model to explain the device properties. Detailed analysis of CdS/CdTe and SnO{sub 2}/CdTe devices prepared using CSS CdTe is discussed.

Dhere, R. G.; Zhang, Y.; Romero, M. J.; Asher, S. E.; Young, M.; To, B.; Noufi, R.; Gessert, T. A.

2008-05-01T23:59:59.000Z

328

Immunomodulation by atorvastatin upregulates expression of gap junction proteins in coxsackievirus B3 (CVB3)-induced myocarditis  

Science Journals Connector (OSTI)

To investigate the effect of atorvastatin on myocardial expression of gap junction proteins, connexins (Cxs), during coxsackievirus B3 (CVB3)-induced myocarditis.

Alian Zhang; Huili Zhang; Shiyao Wu

2010-04-01T23:59:59.000Z

329

Junction Evolution During Fabrication of CdS/CdTe Thin-film PV Solar Cells (Presentation)  

SciTech Connect (OSTI)

Discussion of the formation of CdTe thin-film PV junctions and optimization of CdTe thin-film PV solar cells.

Gessert, T. A.

2010-09-01T23:59:59.000Z

330

DOE/EA-1312: Environmental Assessment of Ground Water Compliance at the Grand Junction UMTRA Project Site (Climax Uranium Millsite) (September 1999)  

Broader source: Energy.gov (indexed) [DOE]

2 2 Rev. 0 Environmental Assessment of Ground Water Compliance at the Grand Junction UMTRA Project Site (Climax Uranium Millsite) Final September 1999 Prepared by U.S. Department of Energy Grand Junction Office Grand Junction, Colorado Work Performed Under DOE Contract No. DE-AC13-96GJ87335 for the U.S. Department of Energy EA of Ground Water Compliance at the Grand Junction UMTRA Project Site DOE Grand Junction Office Page ii Final September 1999 Contents Executive Summary.........................................................................................................................v 1.0 Introduction...............................................................................................................................1 1.1 Grand Junction UMTRA Project Site Location and Description.........................................1

331

Vortex motion in Josephson-junction arrays near f=0 and f=1/2  

Science Journals Connector (OSTI)

We study vortex motion in two-dimensional Josephson arrays at magnetic fields near zero and one-half flux quanta per plaquette (f=0 and f=1/2). The array is modeled as a network of resistively and capacitively shunted Josephson junctions at temperature T=0. Calculations are carried out over a range of the McCumber-Stewart junction damping parameter ?. Near both f=0 and f=1/2, the I-V characteristics exhibit two critical currents, Ic1(f) and Ic2(f), representing the critical current for depinning a single vortex, and for depinning the entire ground-state phase configuration. Near f=0, single vortex motion just above Ic1(0) leads to Josephson-like voltage oscillations. The motion of the vortex is seemingly overdamped (i.e., nonhysteretic) even when the individual junction parameters are highly underdamped, in agreement with experiments. At sufficiently large ?, and sufficiently high vortex velocity, the vortex breaks up into a row of resistively switched junctions perpendicular to the current. Near f=1/2, the vortex potential, and corresponding vortex trajectories, are more complicated than near f=0. Nevertheless, the vortex is still overdamped even when the individual junctions are highly underdamped, and there is still row-switching behavior at large values of ?. A high-energy vortex in a very underdamped array tends to generate resistively switched rows rather than to move ballistically. Some possible explanations for this behavior are discussed.

Wenbin Yu; K. H. Lee; D. Stroud

1993-03-01T23:59:59.000Z

332

Phase retrapping in a pointlike $\\varphi$ Josephson junction: the Butterfly effect  

E-Print Network [OSTI]

We consider a $\\varphi$ Josephson junction, which has a bistable zero-voltage state with the stationary phases $\\psi=\\pm\\varphi$. In the non-zero voltage state the phase "moves" viscously along a tilted periodic double-well potential. When the tilting is reduced quasistatically, the phase is retrapped in one of the potential wells. We study the viscous phase dynamics to determine in which well ($-\\varphi$ or $+\\varphi$) the phase is retrapped for a given damping, when the junction returns from the finite-voltage state back to zero-voltage state. In the limit of low damping the $\\varphi$ Josephson junction exhibits a butterfly effect --- extreme sensitivity of the destination well on damping. This leads to an impossibility to predict the destination well.

E. Goldobin; R. Kleiner; D. Koelle; R. G. Mints

2013-07-30T23:59:59.000Z

333

Bunching of fluxons in a long Josephson junction with surface losses  

SciTech Connect (OSTI)

It is known that the sine-Gordon model of a long Josephson junction with a surface-loss term predicts a spatially oscillating trailing tail of a strongly contracted fluxon. In the present work, it is demonstrated that this should give rise to bunched (bound) states of fluxons, although the onset of the bunching drastically differs from the standard situation recently investigated in terms of the perturbed nonlinear Schroedinger model. Influence of the bunching on the [ital I]-[ital V] characteristic of an annular junction with a finite number of trapped fluxons is analyzed qualitatively. It is demonstrated that the bunching may set in with a small hysteresis, and it increases voltage at a given current. The latter effect has been observed in most recent experiments with the annular junction.

Malomed, B.A. (Department of Physics, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, Illinois (United States))

1993-01-01T23:59:59.000Z

334

Alternating dynamic state in intrinsic Josephson-junction stacks self-generated by internal resonance.  

SciTech Connect (OSTI)

Intrinsic Josephson-junction stacks realized in high-temperature superconductors provide a very attractive base for developing coherent sources of electromagnetic radiation in the terahertz frequency range. A promising way to synchronize phase oscillations in all the junctions is to excite an internal cavity resonance. We demonstrate that this resonance promotes the formation of an alternating coherent state, in which the system spontaneously splits into two subsystems with different phase-oscillation patterns. There is a static phase shift between the oscillations in the two subsystems, which changes from 0 to 2 in a narrow region near the stack center. The oscillating electric and magnetic fields are almost homogeneous in all the junctions. The formation of this state promotes efficient pumping of the energy into the cavity resonance leading to strong resonance features in the current-voltage dependence.

Koshelev, A. E.; Materials Science Division

2008-01-01T23:59:59.000Z

335

Nonequilibrium transport through quantum-wire junctions and boundary defects for free massless bosonic fields  

E-Print Network [OSTI]

We consider a model of quantum-wire junctions where the latter are described by conformal-invariant boundary conditions of the simplest type in the multicomponent compactified massless scalar free field theory representing the bosonized Luttinger liquids in the bulk of wires. The boundary conditions result in the scattering of charges across the junction with nontrivial reflection and transmission amplitudes. The equilibrium state of such a system, corresponding to inverse temperature $\\beta$ and electric potential $V$, is explicitly constructed both for finite and for semi-infinite wires. In the latter case, a stationary nonequilibrium state describing the wires kept at different temperatures and potentials may be also constructed. The main result of the present paper is the calculation of the full counting statistics (FCS) of the charge and energy transfers through the junction in a nonequilibrium situation. Explicit expressions are worked out for the generating function of FCS and its large-deviations asym...

Gaw?dzki, Krzysztof

2015-01-01T23:59:59.000Z

336

Delocalised oxygen as the origin of two-level defects in Josephson junctions  

E-Print Network [OSTI]

One of the key problems facing superconducting qubits and other Josephson junction devices is the decohering effects of bi-stable material defects. Although a variety of phenomenological models exist, the true microscopic origin of these defects remains elusive. For the first time we show that these defects may arise from delocalisation of the atomic position of the oxygen in the oxide forming the Josephson junction barrier. Using a microscopic model, we compute experimentally observable parameters for phase qubits. Such defects are charge neutral but have non-zero response to both applied electric field and strain. This may explain the observed long coherence time of two-level defects in the presence of charge noise, while still coupling to the junction electric field and substrate phonons.

Timothy C. DuBois; Manolo C. Per; Salvy P. Russo; Jared H. Cole

2012-06-12T23:59:59.000Z

337

High temperature superconducting step-edge SNS Josephson junctions on silicon substrates  

SciTech Connect (OSTI)

The authors have fabricated and tested YBCO step-edge SNS Josephson junctions on silicon substrates. The silicon step edges were patterned photolithographically and reactively ion etched using an SF{sub 6} plasma. The structures were fabricated through sequential angled pulsed laser deposition of yttria stabilized zirconia, YBCO, and gold layers, followed by photolithographic patterning and ion milling. The completed devices showed resistively shunted junction (RSJ)-like current voltage characteristics and microwave induced Shapiro Steps. Critical currents as large as 84 {micro}A and resistances of order 0.5 {Omega} were obtained. Measurable critical currents were observed up to 76 K. The authors report on the fabrication and properties of these junctions.

Rosenthal, P.A.; Cosgrove, J.E.; Fenner, D.B.; Rudman, D.A. [Advanced Fuel Research, Inc., East Hartford, CT (United States); Vale, L.R.; Ono, R.H. [NIST, Boulder, CO (United States)

1996-11-01T23:59:59.000Z

338

Ground-water hydrology of the Panther Junction area of Big Bend National Park, Texas  

E-Print Network [OSTI]

GROUND-WATER HYDROLOGY OF THE PANTHER JUNCTION AREA OF BIG BEND NATIONAL PARK, TEXAS A Thesis by JOHN LAWRENCE GIBSON Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirements for the degree... of MASTER OF SCIENCE August 1983 Major Subject: Geology GROUND-WATER HYDROLOGY OF THE PANTHER JUNCTION AREA OF BIG BEND NATIONAL PARK, TEXAS A Thesis by JOHN LAWRENCE GIBSON Approved as to style and content by: Melv'n C. Schroeder (Chairman...

Gibson, John Lawrence

2012-06-07T23:59:59.000Z

339

Detection of coherent superpositions of phase states by full counting statistics in a Bose Josephson junction  

SciTech Connect (OSTI)

We study a Bose Josephson junction realized with a double-well potential. We propose a strategy to observe the coherent superpositions of phase states occurring during the time evolution after a sudden rise of the barrier separating the two wells. We show that their phase content can be obtained by the full counting statistics of the spin-boson operators characterizing the junction, which could be mapped out by repeated measurements of the population imbalance after rotation of the state. This measurement can distinguish between coherent superpositions and incoherent mixtures, and can be used for a two-dimensional tomographic reconstruction of the phase content of the state.

Ferrini, G.; Minguzzi, A.; Hekking, F. W. J. [Laboratoire de Physique et Modelisation des Milieux Condenses, Universite Joseph Fourier-CNRS, BP 166, 38042 Grenoble (France)

2009-10-15T23:59:59.000Z

340

Direct Observation of Tunneling and Nonlinear Self-Trapping in a Single Bosonic Josephson Junction  

SciTech Connect (OSTI)

We report on the first realization of a single bosonic Josephson junction, implemented by two weakly linked Bose-Einstein condensates in a double-well potential. In order to fully investigate the nonlinear tunneling dynamics we measure the density distribution in situ and deduce the evolution of the relative phase between the two condensates from interference fringes. Our results verify the predicted nonlinear generalization of tunneling oscillations in superconducting and superfluid Josephson junctions. Additionally, we confirm a novel nonlinear effect known as macroscopic quantum self-trapping, which leads to the inhibition of large amplitude tunneling oscillations.

Albiez, Michael; Gati, Rudolf; Foelling, Jonas; Hunsmann, Stefan; Oberthaler, Markus K. [Kirchhoff-Institut fuer Physik, Universitaet Heidelberg, Im Neuenheimer Feld 227, D-69120 Heidelberg (Germany); Cristiani, Matteo [CNR-INFM, Dipartimento di Fisica E. Fermi, Universita di Pisa, Largo B. Pontecorvo 3, I-56127 Pisa (Italy)

2005-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "junction greenfield grundy" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

Defect motion and lattice pinning barriers in Josephson-junction ladders  

SciTech Connect (OSTI)

We study the motion of domain wall defects in a fully frustrated Josephson-junction ladder system, driven by small applied currents. For small system sizes, the energy barrier E{sub B} to the defect motion is computed analytically via symmetry and topological considerations. More generally, we perform numerical simulations directly on the equations of motion, based on the resistively-shunted junction model, to study the dynamics of defects, varying the system size. Coherent motion of domain walls is observed for large system sizes. In the thermodynamical limit, we find E{sub B}=0.1827 in units of the Josephson coupling energy.

Kang, H.; Lim, Jong Soo [Department of Physics and Center for Theoretical Physics, Seoul National University, Seoul 151-747 (Korea, Republic of); Fortin, J.-Y. [Laboratoire de Physique Theorique, Universite Louis Pasteur, 67084 Strasbourg (France); Choi, J. [Department of Physics, Keimyung University, Daegu 704-701 (Korea, Republic of); Choi, M. Y. [Department of Physics and Center for Theoretical Physics, Seoul National University, Seoul 151-747 (Korea, Republic of); Korea Institute for Advanced Study, Seoul 130-722 (Korea, Republic of)

2006-01-01T23:59:59.000Z

342

Atomic delocalisation as a microscopic origin of two-level defects in Josephson junctions  

E-Print Network [OSTI]

Identifying the microscopic origins of decoherence sources prevalent in Josephson junction based circuits is central to their use as functional quantum devices. Focussing on so called "strongly coupled" two-level defects, we construct a theoretical model using the atomic position of the oxygen which is spatially delocalised in the oxide forming the Josephson junction barrier. Using this model, we investigate which atomic configurations give rise to two-level behaviour of the type seen in experiments. We compute experimentally observable parameters for phase qubits and examine defect response under the effects of applied electric field and strain.

Timothy C. DuBois; Salvy P. Russo; Jared H. Cole

2014-08-25T23:59:59.000Z

343

Strongly-coupled Josephson junction array for simulation of frustrated one-dimensional spin models  

E-Print Network [OSTI]

We study the capacitance-coupled Josephson junction array beyond the small-coupling limit. We find that, when the scale of the system is large, its Hamiltonian can be obtained without the small-coupling approximation and the system can be used to simulate strongly frustrated one-dimensional Ising spin problems. To engineer the system Hamiltonian for an ideal theoretical model, we apply a dynamical decoupling technique to eliminate undesirable couplings in the system. Using a 6-site junction array as an example, we numerically evaluate the system to show that it exhibits important characteristics of the frustrated spin model.

Liang-Hui Du; Xingxiang Zhou; Yong-Jian Han; Guang-Can Guo; Zheng-Wei Zhou

2012-12-20T23:59:59.000Z

344

Manipulating the magnetic state of a carbon nanotube Josephson junction using the superconducting phase  

E-Print Network [OSTI]

We study the supercurrent of a carbon nanotube quantum dot Josephson junction in a parameter regime in which the Kondo energy and the superconducting gap are of comparable size. For gate voltages in the vicinity of a Kondo ridge the superconducting phase difference can then be used to tune the magnetic state from a singlet to a doublet. Accordingly our measured current phase relation crosses over from 0 to $\\pi$-junction behavior, exhibiting strong anharmonicities. The experimental results are in excellent agreement with our numerically exact finite temperature quantum Monte Carlo simulations and provide insights on the phase-controlled level-crossing transition at zero temperature.

R. Delagrange; D. J. Luitz; R. Weil; A. Kasumov; V. Meden; H. Bouchiat; R. Deblock

2015-01-14T23:59:59.000Z

345

Hetero-junctions of Boron Nitride and Carbon Nanotubes: Synthesis and Characterization  

SciTech Connect (OSTI)

Hetero-junctions of boron nitride nanotubes (BNNTs) and carbon nanotubes (CNTs) are expected to have appealing new properties that are not available from pure BNNTs and CNTs. Theoretical studies indicate that BNNT/CNT junctions could be multifunctional and applicable as memory, spintronic, electronic, and photonics devices with tunable band structures. This will lead to energy and material efficient multifunctional devices that will be beneficial to the society. However, experimental realization of BNNT/CNT junctions was hindered by the absent of a common growth technique for BNNTs and CNTs. In fact, the synthesis of BNNTs was very challenging and may involve high temperatures (up to 3000 degree Celsius by laser ablation) and explosive chemicals. During the award period, we have successfully developed a simple chemical vapor deposition (CVD) technique to grow BNNTs at 1100-1200 degree Celsius without using dangerous chemicals. A series of common catalyst have then been identified for the synthesis of BNNTs and CNTs. Both of these breakthroughs have led to our preliminary success in growing two types of BNNT/CNT junctions and two additional new nanostructures: 1) branching BNNT/CNT junctions and 2) co-axial BNNT/CNT junctions, 3) quantum dots functionalized BNNTs (QDs-BNNTs), 4) BNNT/graphene junctions. We have started to understand their structural, compositional, and electronic properties. Latest results indicate that the branching BNNT/CNT junctions and QDs-BNNTs are functional as room-temperature tunneling devices. We have submitted the application of a renewal grant to continue the study of these new energy efficient materials. Finally, this project has also strengthened our collaborations with multiple Department of Energyâ??s Nanoscale Science Research Centers (NSRCs), including the Center for Nanophase Materials Sciences (CNMS) at Oak Ridge National Laboratory, and the Center for Integrated Nanotechnologies (CINTs) at Sandia National Laboratories and Los Alamos National Laboratory. Results obtained during the current funding period have led to the publication of twelve peer reviewed articles, three review papers, two book and one encyclopedia chapters, and thirty eight conference/seminar presentation. One US provisional patent and one international patent have also been filed.

Yap, Yoke Khin

2013-03-14T23:59:59.000Z

346

Semiconductor device PN junction fabrication using optical processing of amorphous semiconductor material  

DOE Patents [OSTI]

Systems and methods for semiconductor device PN junction fabrication are provided. In one embodiment, a method for fabricating an electrical device having a P-N junction comprises: depositing a layer of amorphous semiconductor material onto a crystalline semiconductor base, wherein the crystalline semiconductor base comprises a crystalline phase of a same semiconductor as the amorphous layer; and growing the layer of amorphous semiconductor material into a layer of crystalline semiconductor material that is epitaxially matched to the lattice structure of the crystalline semiconductor base by applying an optical energy that penetrates at least the amorphous semiconductor material.

Sopori, Bhushan; Rangappan, Anikara

2014-11-25T23:59:59.000Z

347

Monolithic interconnected module with a tunnel junction for enhanced electrical and optical performance  

DOE Patents [OSTI]

An improved thermophotovoltaic (TPV) n/p/n device is provided. Monolithic Interconnected Modules (MIMS), semiconductor devices converting infrared radiation to electricity, have been developed with improved electrical and optical performance. The structure is an n-type emitter on a p-type base with an n-type lateral conduction layer. The incorporation of a tunnel junction and the reduction in the amount of p-type material used results in negligible parasitic absorption, decreased series resistance, increased voltage and increased active area. The novel use of a tunnel junction results in the potential for a TPV device with efficiency greater than 24%.

Murray, Christopher S. (Bethel Park, PA); Wilt, David M. (Bay Village, OH)

2000-01-01T23:59:59.000Z

348

Microwave-induced ''Devil's Staircase'' structure and ''Chaotic'' behavior in current-fed Josephson junctions  

SciTech Connect (OSTI)

We have obtained the various types of I-V characteristics measured experimentally and in analog simulations, by merely changing the junction and the microwave parameters within the same resistively shunted junction model with purely sinusoidal current-phase relation. It was found that the subharmonic steps do exist in the limit b/sub c/..-->..0, though they can have finite rounding without thermal noise. The statistical properties of the ''chaotic'' solutions wer e discussed and their effective temperature was defined and calculated.

Ben-Jacob, E.; Braiman, Y.; Shainsky, R.; Imry, Y.

1981-05-15T23:59:59.000Z

349

PHYSICAL REVIEW B 85, 214522 (2012) Area-dependence of spin-triplet supercurrent in ferromagnetic Josephson junctions  

E-Print Network [OSTI]

PHYSICAL REVIEW B 85, 214522 (2012) Area-dependence of spin-triplet supercurrent in ferromagnetic June 2012) Josephson junctions containing multiple ferromagnetic layers can carry spin-triplet Josephson junctions Yixing Wang, W. P. Pratt Jr., and Norman O. Birge* Department of Physics and Astronomy

Birge, Norman

350

PHYSICAL REVIEW B 90, 075401 (2014) Subgap structure in the conductance of a three-terminal Josephson junction  

E-Print Network [OSTI]

-terminal Josephson junction A. H. Pfeffer,1,2 J. E. Duvauchelle,1,2 H. Courtois,3,4 R. M´elin,3,4 D. Feinberg,3)-superconductor (S) Josephson junctions are investigated. In a geometry where a T-shape normal metal is connected

Boyer, Edmond

351

Measurements and Predictions of the Heat Transfer at the Tube-Fin Junction for Louvered Fin Heat Exchangers  

E-Print Network [OSTI]

Measurements and Predictions of the Heat Transfer at the Tube-Fin Junction for Louvered Fin Heat Transfer at the Tube-Fin Junction for Louvered Fin Heat Exchangers Abstract The dominant thermal resistance used to increase heat transfer by initiating new boundary layer growth and increasing surface area

Thole, Karen A.

352

Phase Diffusion in Graphene-Based Josephson Junctions I. V. Borzenets, U. C. Coskun, S. J. Jones, and G. Finkelstein  

E-Print Network [OSTI]

Phase Diffusion in Graphene-Based Josephson Junctions I. V. Borzenets, U. C. Coskun, S. J. Jones July 2011; published 21 September 2011) We report on graphene-based Josephson junctions with contacts. We attribute this resistance to the phase diffusion mechanism, which has not been yet identified

Finkelstein, Gleb

353

A Three-Helix Junction Is the Interface between Two Functional Domains of Prohead RNA in ?29 DNA Packaging  

Science Journals Connector (OSTI)

...Junction Is the Interface between Two...reaction by measuring the production...reference to a standard curve. To determine...for three-dimensional reconstruction...bars represent standard deviations...cryoEM three-dimensional (3D) image...junction is the interface between two...

Wei Zhao; Mitul Saha; Ailong Ke; Marc C. Morais; Paul J. Jardine; Shelley Grimes

2012-08-15T23:59:59.000Z

354

Nanobonding for Multi-Junction Solar Cells at Room Temperature T. Yu, M. M. R. Howlader*, F. Zhang, M. Bakr  

E-Print Network [OSTI]

in windows, roofs and outside walls of new houses and buildings at the construction stage [1]. Among variousNanobonding for Multi-Junction Solar Cells at Room Temperature T. Yu, M. M. R. Howlader*, F. Zhang of the interfacial properties of Si/GaAs indicates its potential use on the fabrication of multi-junction solar cells

Howlader, Matiar R

355

DOE/EA-1338: Finding of No Significant Impact Transfer of the Department of Energy Grand Junction Project Office To Non-DOE Ownership (04/25/00)  

Broader source: Energy.gov (indexed) [DOE]

8 8 F I N A L Environmental Assessment for the Transfer of the Department of Energy Grand Junction Office to Non-DOE Ownership April 2000 U.S. Department of Energy * Grand Junction Office * 2597 B ¾ Road * Grand Junction, CO 81503 Grand Junction Office Environmental Assessment Final DOE/EA-1338 FINAL Environmental Assessment for the Transfer of the Department of Energy Grand Junction Office to Non-DOE Ownership April 2000 U.S. Department of Energy Grand Junction Office 2597 B ¾ Road Grand Junction, CO 81503 Grand Junction Office Environmental Assessment Final i April 2000 TABLE OF CONTENTS Title Page Table of Contents ......................................................................................................................................... i List of Figures ............................................................................................................................................iii

356

Ensuring Productive Resolution by the Junction-Resolving Enzyme RuvC: Large Enhancement of the Second-Strand Cleavage Rate  

Science Journals Connector (OSTI)

Table 1:? Rates of Cleavage of Synthetic DNA Junctions by RuvCa ... Table 2:? Rates of Cleavage by RuvC of Synthetic DNA Junctions Containing Oligoadenine Bulges at the Point of Strand Exchangea ...

Jonathan M. Fogg; David M. J. Lilley

2000-12-01T23:59:59.000Z

357

he transfer of a quantum state between distant locations can be realized using condensed matter systems such as spin chains and Josephson junction arrays. The  

E-Print Network [OSTI]

systems such as spin chains and Josephson junction arrays. The feasibility of such proposals may open, leads to clear signatures of crossed boxes are the Josephson junctions the modified properties

Abbondandolo, Alberto

358

Chapter 8: PhotodetectorsChapter 8: Photodetectors i i l f j i h di dPrinciple of pn junction photodiodes  

E-Print Network [OSTI]

photodiodes RAMO's theorem and external photocurrentp Photodiode materials Quantum efficiency and responsivity pin photodiodespin photodiodes Avalanche photodiodes Heterojunction photodiodes Photoconductive;Principle of the pn Junction PhotodiodesPrinciple of the pn Junction Photodiodes Photodetectors/photodiodes

Wang, Jianfang

359

Several small Josephson junctions in a resonant cavity: Deviation from the Dicke model W. A. Al-Saidi* and D. Stroud  

E-Print Network [OSTI]

Several small Josephson junctions in a resonant cavity: Deviation from the Dicke model W. A. Al-Saidi

Stroud, David

360

Microwave bifurcation of a Josephson junction: Embedding-circuit requirements V. E. Manucharyan, E. Boaknin, M. Metcalfe, R. Vijay, I. Siddiqi,* and M. Devoret  

E-Print Network [OSTI]

Microwave bifurcation of a Josephson junction: Embedding-circuit requirements V. E. Manucharyan, E with the nonlinear dynamics of a Josephson junction embedded in an arbitrary microwave circuit. We find sufficient recently proposed3,4 to use the dynamical bifurcation of a rf-biased Josephson junction JJ as a basis

Devoret, Michel H.

Note: This page contains sample records for the topic "junction greenfield grundy" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

JOURNAL DE PHYSIQUE Colloque C6, supplgment au no 8, Tome 39, aotit 1978,page C6-575 NOISE DOWN-CONVERSION IN A PUMPED JOSEPHSON JUNCTION  

E-Print Network [OSTI]

-CONVERSION IN A PUMPED JOSEPHSON JUNCTION NASA Goddard Institute for Space Studies, Goddard Space Flight Center, New York Josephson junction i s stu- died numerically. Calculation shows t h a t the excess low-frequency noise i n simulator has been used to compute the low- frequency noise i n a pumped Josephson junction / 4 / . Although

Boyer, Edmond

362

arXiv:1008.2085v3[astro-ph.CO]23Nov2011 Axion physics in a Josephson junction environment  

E-Print Network [OSTI]

arXiv:1008.2085v3[astro-ph.CO]23Nov2011 Axion physics in a Josephson junction environment Christian experiments based on Josephson junctions, SQUIDS, and coupled Josephson qubits have a cosmological inter- actions in a resonant Josephson junction environment can be tested, similar in nature to recent

Beck, Christian

363

arXiv:1110.5871v1[astro-ph.IM]26Oct2011 Testing axion physics in a Josephson junction environment  

E-Print Network [OSTI]

arXiv:1110.5871v1[astro-ph.IM]26Oct2011 Testing axion physics in a Josephson junction environmentNS, UK We suggest that experiments based on Josephson junctions, SQUIDS, and coupled Josephson qubits in which axionic interaction strengths in a Josephson junction environment can be tested, similar in nature

Beck, Christian

364

Optimization of Spin-Triplet Supercurrent in Ferromagnetic Josephson Junctions Carolin Klose, Trupti S. Khaire, Yixing Wang, W. P. Pratt, Jr., and Norman O. Birge*  

E-Print Network [OSTI]

Optimization of Spin-Triplet Supercurrent in Ferromagnetic Josephson Junctions Carolin Klose-range spin-triplet supercurrents in Josephson junctions containing ferromag- netic (F) materials, which for spin-triplet super- current in S/F/S Josephson junctions containing only conventional spin

Birge, Norman

365

This approximation simplifies the analysis of fluxon oscillations by avoiding the compli-cated interplay with cavity resonances. It is valid for very long junctions ( ) used in  

E-Print Network [OSTI]

magnetically coupled long Josephson junctions is reported. Time dependent synchronized voltage response. Simulations show that Josephson junctions operating in the in­phase flux­flow mode may generate rf radiation power by a factor of more than four larger than that of a single Josephson junction. The radiation

Wallraff, Andreas

366

Ann. Phys. (Leipzig) 16, No. 1011, 736750 (2007) / DOI 10.1002/andp.200710263 Josephson junctions as detectors for non-Gaussian noise  

E-Print Network [OSTI]

Ann. Phys. (Leipzig) 16, No. 10­11, 736­750 (2007) / DOI 10.1002/andp.200710263 Josephson junctions 2007 Key words Josephson junction, noise, counting statistics. PACS 72.70.+m, 74.40.+k, 74.50.+r of the electrical current can be detected with a Josephson junction placed on-chip with the noise source. We present

Birge, Norman

367

One-dimensional Mott localization of quantum vortices in Josephson-junction arrays A. van Oudenaarden, B. van Leeuwen, M. P. M. Robbens, and J. E. Mooij  

E-Print Network [OSTI]

One-dimensional Mott localization of quantum vortices in Josephson-junction arrays A. van long and narrow arrays of small Josephson junctions is studied experimentally. We investigate for electrons and a superfluid phase for bosons. One- dimensional Josephson-junction arrays are very suitable

van Oudenaarden, Alexander

368

Experimental Study of Electron Transport through Nanometer-Scale Metal-Oxide Junctions  

E-Print Network [OSTI]

-annealing. The resistive bistability effect has been observed for all these materials, with particularly high switching, crested barrier, rapid thermal annealing, endurance, resistive bistability, reproducibility. #12;v List properties of Nb/Al/Nb junctions fabricated using thermal oxidation or rf-plasma oxidation at various

369

DESIGN APPROACHES AND MATERIALS PROCESSES FOR ULTRAHIGH EFFICIENCY LATTICE MISMATCHED MULTI-JUNCTION SOLAR CELLS  

E-Print Network [OSTI]

-JUNCTION SOLAR CELLS Melissa J. Griggs 1 , Daniel C. Law 2 , Richard R. King 2 , Arthur C. Ackerman 3 , James M. Zahler 3 , Harry A. Atwater 1 1 California Institute of Technology, 1200 East California Boulevard, Pasadena, California 91125, USA 2 Spectrolab Engineering Inc., 12500 Gladstone Avenue, Sylmar, California

Atwater, Harry

370

Mercury-Mercury Tunneling Junctions. 1. Electron Tunneling Across Symmetric and Asymmetric Alkanethiolate Bilayers  

E-Print Network [OSTI]

Mercury-Mercury Tunneling Junctions. 1. Electron Tunneling Across Symmetric and Asymmetric by bringing in contact two small (3 ? 10-3 cm2) mercury drop electrodes in a 5-20% (v/v) hexadecane solution incorporating alkanethiolate-type monolayer films. The results reported below convince us that the mercury

Majda, Marcin

371

Silicon Solar Cells with Front Hetero-Contact and Aluminum Alloy Back Junction: Preprint  

SciTech Connect (OSTI)

We prototype an alternative n-type monocrystalline silicon (c-Si) solar cell structure that utilizes an n/i-type hydrogenated amorphous silicon (a-Si:H) front hetero-contact and a back p-n junction formed by alloying aluminum (Al) with the n-type Si wafer.

Yuan, H.-C.; Page, M. R.; Iwaniczko, E.; Xu, Y.; Roybal, L.; Wang, Q.; Branz, H. M.; Meier, D. L.

2008-05-01T23:59:59.000Z

372

INVESTIGATION OF THE ELECTRICAL PROPERTIES OF METAL/PYRITE (FeS2) JUNCTIONS  

E-Print Network [OSTI]

photovoltaic technology. From the first set of data collected, Cr, Al, and Fe pyrite junctions exhibit light range, making it ideal for photovoltaic application. Unlike silicon (Si), pyrite is easily obtainable at a very low cost (Wadia et al 2009:2568). Out of 23 promising semiconducting materials, twelve

Hall, Sharon J.

373

On the 1D Modeling of Fluid Flowing through a Junction  

E-Print Network [OSTI]

Consider a fluid flowing through a junction between two pipes with different sections. Its evolution is described by the 2D or 3D Euler equations, whose analytical theory is far from complete and whose numerical treatment may be rather costly. This note compares different 1D approaches to this phenomenon.

Rinaldo M. Colombo; Mauro Garavello

2009-03-04T23:59:59.000Z

374

Conductance states of molecular junctions for encoding binary information: a computational approach  

E-Print Network [OSTI]

-molecule-metal and metal-molecule-semiconductor junctions are considered. The molecule used is an olygo(phenylene ethynylene) composed of three benzene rings and a nitro group in the middle ring; this molecule is referred hereafter as the nitroOPE molecule. Gold, silicon...

Agapito, Luis Alberto

2009-06-02T23:59:59.000Z

375

Direct injection tunnel spectroscopy of a p-n junction Edward M. Likovich,1  

E-Print Network [OSTI]

Direct injection tunnel spectroscopy of a p-n junction Edward M. Likovich,1 Kasey J. Russell,1,a tunnel injection of electrons. In contrast to the metal-base transistor design of conventional ballistic the semiconductor before they scatter and thermal- ize to the chemical potential of the base layer. For systems

Russell, Kasey

376

Dynamical properties of Josephson-junctions arrays. Final report, 15 Sep 89-14 Sep 91  

SciTech Connect (OSTI)

Current and recent work in the group on Josephson junction arrays has been focused on two particular types of dynamical states, namely chaotic states and 'chain' states. In the following the authors summarize briefly the issues addressed and the significant results obtained for each type of state.

Ebner, C.A.; Jayaprakash, C.

1992-07-01T23:59:59.000Z

377

Resonant electromagnetic emission from intrinsic Josephson-junction stacks with laterally modulated Josephson critical current.  

SciTech Connect (OSTI)

Intrinsic Josephson-junction stacks realized in mesas fabricated out of high-temperature superconductors may be used as sources of coherent electromagnetic radiation in the terahertz range. The major challenge is to synchronize Josephson oscillations in all junctions in the stack to get significant radiation out of the crystal edge parallel to the c axis. We suggest a simple way to solve this problem via artificially prepared lateral modulation of the Josephson critical current identical in all junctions. In such a stack, phase oscillations excite the in-phase Fiske mode when the Josephson frequency matches the Fiske-resonance frequency which is set by the stack lateral size. The powerful, almost standing electromagnetic wave is excited inside the crystal in the resonance. This wave is homogeneous across the layers, meaning that the oscillations are synchronized in all junctions in the stack. We evaluate behavior of the I-V characteristics and radiated power near the resonance for arbitrary modulation and find exact solutions for several special cases corresponding to symmetric and asymmetric modulations of the critical current.

Koshelev, A. E.; Bulaevskii, L. N.; Materials Science Division; LANL

2008-01-01T23:59:59.000Z

378

Nucleation-controlled vortex entry in a square-columnar Josephson-junction array  

SciTech Connect (OSTI)

The initial magnetization curve of square-columnar Josephson-junction arrays is calculated from fundamental laws. It is found that the first vortex entry is controlled by vortex nucleation rather than surface depinning and it occurs at a field greater than that predicted by the traditional surface-barrier theory. {copyright} {ital 1997} {ital The American Physical Society}

Chen, D.; Moreno, J.J.; Hernando, A. [Instituto de Magnetismo Aplicado, RENFE-UCM-CSIC, 28230 Las Rozas, Madrid (Spain)] [Instituto de Magnetismo Aplicado, RENFE-UCM-CSIC, 28230 Las Rozas, Madrid (Spain)

1997-08-01T23:59:59.000Z

379

How to achieve in-phase locking in small-inductance Josephson junction ladder arrays  

SciTech Connect (OSTI)

We present the results of an analytical study of phase locking in externally loaded two-dimensional Josephson junction ladder arrays with small, but non-vanishing ring inductances. A Lyapunov stability based condition is found controlling realization of the radiating in-phase oscillation regime. {copyright} {ital 1998 American Institute of Physics.}

Basler, M.; Krech, W.; Platov, K.Y. [Friedrich-Schiller-Universitaet Jena, Institut fuer Festkoerperphysik, Max-Wien-Platz 1, D-07743Jena (Germany)] [Friedrich-Schiller-Universitaet Jena, Institut fuer Festkoerperphysik, Max-Wien-Platz 1, D-07743Jena (Germany)

1998-01-01T23:59:59.000Z

380

Quantized resonator field coupled to a current-biased Josephson junction in circuit QED  

E-Print Network [OSTI]

A Lagrangian formalism is used to derive the Hamiltonian for a $\\lambda$/4 resonator shunted by a current-biased Josephson junction. The eigenstates and the quantum dynamics of the system are analyzed numerically, and we show that the system can function as an efficient detector of weak incident microwave fields.

Christian Kraglund Andersen; Gregor Oelsner; Evgeni Il'ichev; Klaus Mlmer

2014-03-27T23:59:59.000Z

Note: This page contains sample records for the topic "junction greenfield grundy" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

Microsimulation analysis of a hybrid system model of multiple merge junction highway and semiautomatic vehicles  

E-Print Network [OSTI]

Microsimulation analysis of a hybrid system model of multiple merge junction highway and semi Abstract In this paper we present a protocol that controls semi­automated autonomous vehicles driving is in the merge lane) and the yielding (the vehicle is in the main lane). We show a simulation study that presents

Girault, Alain

382

Improved One-dimensional Analysis of CMOS Photodiode Including Epitaxial-Substrate Junction  

E-Print Network [OSTI]

1 Improved One-dimensional Analysis of CMOS Photodiode Including Epitaxial-Substrate Junction J. S-dimensional analysis of CMOS photodiode has been derived in which the effect of the substrate, which forms a high-empirical expression exhibits a good agreement with the measured spectral response of n+ pepi photodiodes fabricated

Hornsey, Richard

383

ELECTRONICS' 2008 24 26 September, Sozopol, BULGARIA RESPONSE TIME OF SHALLOW JUNCTION SILICON PHOTODIODES  

E-Print Network [OSTI]

PHOTODIODES Lei Shi1 , Sha Xia1 , Francesco Sarubbi1 , Rik Naulaerts2 , Stoyan Nihtianov1,2 , Lis Nanver1 1, shape and location of the illuminated part of a shallow-junction photodiode, and its series resistance for which the photo-generated charge will be removed from the photodiode) with the illuminated spot size

Technische Universiteit Delft

384

Electronic Heating at High Bias in Atomic-Scale Au Break Junctions Ruoyu Chen,1  

E-Print Network [OSTI]

, U.S.A. Heating in nanoscale systems driven out of equilibrium is of fundamental importance, has O-10 Electronic Heating at High Bias in Atomic-Scale Au Break Junctions Ruoyu Chen,1, Texas, U.S.A. 2 Department of Electrical and Computer Engineering, Rice University, Houston, Texas 77005

385

String Junction Model, Cluster Hypothesis, Penta-Quark Baryon and Tetra-Quark Meson  

Science Journals Connector (OSTI)

......and mB 1 GeV is the ordinary light baryon mass. In this paper...non-strange quarks. Mass of such light penta-quark baryons with NJ...O(10) MeV. While mass of light tetra-quark meson with NJ...junction was first written in the Christmas greeting card of Y. Nambu around......

Masahiro Imachi; Shoichiro Otsuki; Fumihiko Toyoda

2008-10-01T23:59:59.000Z

386

SEB occurrence in a VIP: Influence of the epi-substrate junction  

SciTech Connect (OSTI)

Heavy ion induced burnout is reported, for the first time, in different parts of a VIP. A 2D-simulation investigation allows a better understanding of this phenomenon and shows the importance of the epi-substrate junction parameters in the SEB occurrence.

Lorfevre, E.; Sudre, C.; Dachs, C.; Detcheverry, C.; Palau, J.M.; Gasiot, J. [Univ. Montpellier II (France)] [Univ. Montpellier II (France); Calvet, M.C. [Aerospatiale, Les Mureaux (France)] [Aerospatiale, Les Mureaux (France); Garnier, J.; Ecoffet, R. [Centre National d`Etudes Spatiales, Toulouse (France)] [Centre National d`Etudes Spatiales, Toulouse (France)

1998-06-01T23:59:59.000Z

387

Hamilton-Jacobi equations for optimal control on junctions and Yves Achdou  

E-Print Network [OSTI]

Hamilton-Jacobi equations for optimal control on junctions and networks Yves Achdou , Salom. A notion of viscosity solution of Hamilton-Jacobi equations on the network has been proposed in earlier of optimal control. Keywords Optimal control, networks, Hamilton-Jacobi equations, viscosity solutions AMS 34

Boyer, Edmond

388

On asymptotic effects of boundary perturbations in exponentially shaped Josephson junctions  

E-Print Network [OSTI]

A parabolic integro differential operator L, suitable to describe many phenomena in various physical fields, is considered. By means of equivalence between L and the third order equation describing the evolution inside an exponentially shaped Josephson junction (ESJJ), an asymptotic analysis for (ESJJ) is achieved, explicitly evaluating, boundary contributions related to the Dirichlet problem.

Monica De Angelis; Pasquale Renno

2014-01-02T23:59:59.000Z

389

Tunneling characteristics in chemical vapor deposited graphene hexagonal boron nitride graphene junctions  

E-Print Network [OSTI]

1 Tunneling characteristics in chemical vapor deposited graphene ­ hexagonal boron nitride ­ graphene junctions T. Roy1 , L. Liu2 , S. de la Barrera,3 B. Chakrabarti1,4 , Z. R. Hesabi1 , C. A. Joiner1 Abstract: Large area chemical vapor deposited graphene and hexagonal boron nitride was used to fabricate

Feenstra, Randall

390

Linker Dependent Bond Rupture Force Measurements in Single-Molecule Junctions  

SciTech Connect (OSTI)

We use a modified conducting atomic force microscope to simultaneously probe the conductance of a single-molecule junction and the force required to rupture the junction formed by alkanes terminated with four different chemical link groups which vary in binding strength and mechanism to the gold electrodes. Molecular junctions with amine, methylsulfide, and diphenylphosphine terminated molecules show clear conductance signatures and rupture at a force that is significantly smaller than the measured 1.4 nN force required to rupture the single-atomic gold contact. In contrast, measurements with a thiol terminated alkane which can bind covalently to the gold electrode show conductance and force features unlike those of the other molecules studied. Specifically, the strong Au-S bond can cause structural rearrangements in the electrodes, which are accompanied by substantial conductance changes. Despite the strong Au-S bond and the evidence for disruption of the Au structure, the experiments show that on average these junctions also rupture at a smaller force than that measured for pristine single-atom gold contacts.

Frei M.; Hybertsen M.; Aradhya S.V.; Venkataraman L.

2012-02-16T23:59:59.000Z

391

In situ Formation of Highly Conducting Covalent Au-C Contacts for Single-Molecule Junctions  

SciTech Connect (OSTI)

Charge transport across metal-molecule interfaces has an important role in organic electronics. Typically, chemical link groups such as thiols or amines are used to bind organic molecules to metal electrodes in single-molecule circuits, with these groups controlling both the physical structure and the electronic coupling at the interface. Direct metal-carbon coupling has been shown through C60, benzene and {pi}-stacked benzene but ideally the carbon backbone of the molecule should be covalently bonded to the electrode without intervening link groups. Here, we demonstrate a method to create junctions with such contacts. Trimethyl tin (SnMe{sub 3})-terminated polymethylene chains are used to form single-molecule junctions with a break-junction technique. Gold atoms at the electrode displace the SnMe{sub 3} linkers, leading to the formation of direct Au-C bonded single-molecule junctions with a conductance that is {approx}100 times larger than analogous alkanes with most other terminations. The conductance of these Au-C bonded alkanes decreases exponentially with molecular length, with a decay constant of 0.97 per methylene, consistent with a non-resonant transport mechanism. Control experiments and ab initio calculations show that high conductances are achieved because a covalent Au-C sigma ({sigma}) bond is formed. This offers a new method for making reproducible and highly conducting metal-organic contacts.

Cheng, Z.L.; Hybertsen, M.; Skouta, R.; Vazquez, H.; Widawsky, J.R.; Schneebeli, S.; Chen, W.; Breslow, R.; Venkataraman, L.

2011-06-01T23:59:59.000Z

392

Structure and motion of junctions between coherent and incoherent twin boundaries in copper  

E-Print Network [OSTI]

Structure and motion of junctions between coherent and incoherent twin boundaries in copper J online 4 July 2009 Abstract The atomic mechanisms of twin boundary migration in copper under externally. ? 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. Keywords: Copper

Ghoniem, Nasr M.

393

Nonequilibrium Phenomena in Electron Tunneling in Normal Metal-Insulator-Metal Junctions  

Science Journals Connector (OSTI)

Structure in the conductance of normal metal-insulator-metal junctions at very low bias is explained through a nonequilibrium treatment of the tunneling process. In particular, the related peak in the derivative d?(V)dV is quantitatively accounted for by the blocking of otherwise available electron tunneling states due to the finite electron relaxation rates in the metal electrodes.

P. N. Trofimenkoff; H. J. Kreuzer; W. J. Wattamaniuk; J. G. Adler

1972-08-28T23:59:59.000Z

394

Thermal conductance of the junction between single-walled carbon nanotubes  

E-Print Network [OSTI]

conductances of the carbon nanotube (CNT) junctions that would be found in a CNT aerogel are predicted using of carbon nanotubes (CNTs) (e.g., aligned films, mats, and aerogels) are candidates for use in electronic issue in all of these applications. Our focus here is related to single-walled CNT aerogels, which

McGaughey, Alan

395

Projected Performance of Three- and Four-Junction Devices Using GaAs and GaInP  

E-Print Network [OSTI]

This paper explores the efficiencies expected for three- and four-junction devices for both space and terrestrial applications. For space applications, the effects of temperature and low concentration are investigated. For terrestrial applications, a concentration of 500 suns is assumed and the theoretical efficiencies are calculated as a function of spectral variations including the effects of air mass, turbidity, and water-vapor content. INTRODUCTION Ga 0.5 In 0.5 P/GaAs two-terminal, two-junction solar cells, invented and developed at the National Renewable Energy Laboratory, are in production at both TECSTAR and Spectrolab. The immediate market for these devices is in space; a future (potentially larger) market is terrestrial concentrator systems. The next-generation cells will add additional junction(s) in order to increase the efficiency. Work on a three-junction cell using an active Ge junction under the Ga 0.5 In 0.5 P/GaAs dual-junction cell has already been reported [1]. Ho...

Gainp; S. R. Kurtz; Sarah R. Kurtz; D. Myers; D. Myers; J.M. Olson; J. M. Olson

1997-01-01T23:59:59.000Z

396

Performance analysis of AlGaAs/GaAs tunnel junctions for ultra-high concentration photovoltaics  

Science Journals Connector (OSTI)

An n++-GaAs/p++-AlGaAs tunnel junction with a peak current density of 10?100Acm?2 is developed. This device is a tunnel junction for multijunction solar cells, grown lattice-matched on standard GaAs or Ge substrates, with the highest peak current density ever reported. The voltage drop for a current density equivalent to the operation of the multijunction solar cell up to 10?000suns is below 5mV. Trap-assisted tunnelling is proposed to be behind this performance, which cannot be justified by simple band-to-band tunnelling. The metal-organic vapour-phase epitaxy growth conditions, which are in the limits of the transport-limited regime, and the heavy tellurium doping levels are the proposed origins of the defects enabling trap-assisted tunnelling. The hypothesis of trap-assisted tunnelling is supported by the observed annealing behaviour of the tunnel junctions, which cannot be explained in terms of dopant diffusion or passivation. For the integration of these tunnel junctions into a triple-junction solar cell, AlGaAs barrier layers are introduced to suppress the formation of parasitic junctions, but this is found to significantly degrade the performance of the tunnel junctions. However, the annealed tunnel junctions with barrier layers still exhibit a peak current density higher than 2500Acm?2 and a voltage drop at 10?000suns of around 20mV, which are excellent properties for tunnel junctions and mean they can serve as low-loss interconnections in multijunction solar cells working at ultra-high concentrations.

I Garca; I Rey-Stolle; C Algora

2012-01-01T23:59:59.000Z

397

Quantum dynamics of attractive versus repulsive bosonic Josephson junctions: Bose-Hubbard and full-Hamiltonian results  

SciTech Connect (OSTI)

The quantum dynamics of one-dimensional bosonic Josephson junctions with attractive and repulsive interparticle interactions is studied by using the Bose-Hubbard model and by numerically exact computations of the full many-body Hamiltonian. A symmetry present in the Bose-Hubbard Hamiltonian dictates an equivalence between the evolution in time of the survival probability and the fragmentation of attractive and repulsive Josephson junctions with attractive and repulsive interactions of equal magnitude. The full many-body Hamiltonian does not possess this symmetry and, consequently, the dynamics of the attractive and repulsive junctions are different.

Sakmann, Kaspar; Streltsov, Alexej I.; Alon, Ofir E.; Cederbaum, Lorenz S. [Theoretische Chemie, Physikalisch-Chemisches Institut, Universitaet Heidelberg, Im Neuenheimer Feld 229, D-69120 Heidelberg (Germany)

2010-07-15T23:59:59.000Z

398

Atomic scale 0-pi transition in a high-Tc superconductor/ferromagnetic-insulator/high-T superconductor Josephson junction  

E-Print Network [OSTI]

We study the Josephson transport in a high-Tc superconductor/ferromagnetic-insulator(FI)/high-Tc superconductor numerically. We found the formation of a pi-junction in such systems. More remarkably the ground state of such junction alternates between 0- and pi-states when thickness of FI is increasing by a single atomic layer. We propose an experimental setup for observing the atomic-scale 0-pi transition. Such FI-based pi-junctions can be used to implement highly-coherent quantum bits.

Kawabata, Shiro; Asano, Yasuhiro

2011-01-01T23:59:59.000Z

399

Chemical beam epitaxy growth of AlGaAs/GaAs tunnel junctions using trimethyl aluminium for multijunction solar cells  

SciTech Connect (OSTI)

AlGaAs/GaAs tunnel junctions for use in high concentration multijunction solar cells were designed and grown by chemical beam epitaxy (CBE) using trimethyl aluminium (TMA) as the p-dopant source for the AlGaAs active layer. Controlled hole concentration up to 4?10{sup 20} cm{sup ?3} was achieved through variation in growth parameters. Fabricated tunnel junctions have a peak tunneling current up to 6140 A/cm{sup 2}. These are suitable for high concentration use and outperform GaAs/GaAs tunnel junctions.

Paquette, B.; DeVita, M.; Turala, A.; Kolhatkar, G.; Boucherif, A.; Jaouad, A.; Aimez, V.; Ars, R. [Institut Interdisciplinaire d'Innovation Technologique (3IT), Universit de Sherbrooke, Sherbrooke, Qubec (Canada)] [Institut Interdisciplinaire d'Innovation Technologique (3IT), Universit de Sherbrooke, Sherbrooke, Qubec (Canada); Wilkins, M.; Wheeldon, J. F.; Walker, A. W.; Hinzer, K. [Centre for Research in Photonics, University of Ottawa, Ottawa, ON (Canada)] [Centre for Research in Photonics, University of Ottawa, Ottawa, ON (Canada); Fafard, S. [Cyrium Technologies Inc., Ottawa, ON (Canada)] [Cyrium Technologies Inc., Ottawa, ON (Canada)

2013-09-27T23:59:59.000Z

400

Performance of Ultra High Efficiency Thin Germanium P-N Junction Solar Cells Intended for Solar Thermophotovoltaic Application  

Science Journals Connector (OSTI)

The theoretical upper limit conversion efficiency as a function of cell thickness and ... is calculated for a germanium p-n junction solar cell intended for solar thermophotovoltaic energy conversion which incorp...

E. S. Vera; J. J. Loferski; M. Spitzer

1981-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "junction greenfield grundy" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

Observation of high coherence in Josephson junction qubits measured in a three-dimensional circuit QED architecture  

E-Print Network [OSTI]

Superconducting quantum circuits based on Josephson junctions have made rapid progress in demonstrating quantum behavior and scalability. However, the future prospects ultimately depend upon the intrinsic coherence of Josephson junctions, and whether superconducting qubits can be adequately isolated from their environment. We introduce a new architecture for superconducting quantum circuits employing a three dimensional resonator that suppresses qubit decoherence while maintaining sufficient coupling to the control signal. With the new architecture, we demonstrate that Josephson junction qubits are highly coherent, with $T_2 \\sim 10 \\mu$s to $20 \\mu$s without the use of spin echo, and highly stable, showing no evidence for $1/f$ critical current noise. These results suggest that the overall quality of Josephson junctions in these qubits will allow error rates of a few $10^{-4}$, approaching the error correction threshold.

Hanhee Paik; D. I. Schuster; Lev S. Bishop; G. Kirchmair; G. Catelani; A. P. Sears; B. R. Johnson; M. J. Reagor; L. Frunzio; L. Glazman; S. M. Girvin; M. H. Devoret; R. J. Schoelkopf

2011-11-02T23:59:59.000Z

402

EIS-0126: Remedial Actions at the Former Climax Uranium Company Uranium Mill Site, Grand Junction, Mesa County, Colorado  

Broader source: Energy.gov [DOE]

The U.S. Department of Energy developed this EIS to assess the environmental impacts of remediating the residual radioactive materials left from the inactive uranium processing site and associated properties located in Grand Junction, Colorado.

403

U.S. Department of Energy at Grand Junction 2003 Annual Inspection⎯Monticello, Utah  

Office of Legacy Management (LM)

at Grand Junction 2003 Annual Inspection⎯Monticello, Utah at Grand Junction 2003 Annual Inspection⎯Monticello, Utah November 2003 Page 1 2003 Annual Inspection of the Monticello Mill Tailings (USDOE) and Monticello Radioactively Contaminated Properties Sites Summary The Monticello site, which includes the U.S. Department of Energy (DOE) Monticello Mill Tailings Site (MMTS) and the Monticello Radioactively Contaminated Properties site, was inspected September 23-25, 2003. A follow-up inspection of the Soil and Sediment properties was conducted on October 8, 2003. The Monticello Radioactively Contaminated Properties site is also called the Monticello Vicinity Properties (MVP) and will be referred to as MVP in this report. Restoration work at MVP is complete and is nearly complete at MMTS. MVP is in good

404

Alternative Strategies for Maximizing the Output of Multi-Junction Photovoltaic Panels  

E-Print Network [OSTI]

Multi-junction photovoltaics provide a logical method of increasing the utilization of solar power for a given area. However, their current design and fabrication methods invoke numerous material and cost complexities that limit their potential, particularly for flat panel paradigms. In this paper, three general strategies based on the electrical isolation of the internal sub-layers are described. These strategies involve current or voltage matching the sub-layers by varying of fractional absorption and areal coverage of individual cells within each sub-layer, as well as modifying their combined output using power electronics. A simplified theoretical description of these strategies is provided for pairs of junction materials that allows a more streamlined description of the requirements.

Abrams, Ze'ev R

2014-01-01T23:59:59.000Z

405

Phase slippage and self-trapping in a self-induced bosonic Josephson junction  

SciTech Connect (OSTI)

A dipolar condensate confined in a toroidal trap constitutes a self-induced Josephson junction when the dipoles are oriented perpendicularly to the trap symmetry axis and the s-wave scattering length is small enough. The ring-shaped double-well potential coming from the anisotropic character of the mean-field dipolar interaction is robust enough to sustain self-trapping dynamics, which takes place when the initial population imbalance between the two wells is large. We show that, in this system, the self-trapping regime is directly related to a vortex-induced phase-slip dynamics. A vortex and antivortex are spontaneously nucleated in the low-density regions before a minimum of the population imbalance is reached and then cross the toroidal section in opposite directions through the junctions. This vortex dynamics yields a phase slip between the two weakly linked condensates causing an inversion of the particle flux.

Abad, M.; Guilleumas, M.; Mayol, R.; Pi, M. [Departament d'Estructura i Constituents de la Materia, Facultat de Fisica, Universitat de Barcelona, E-08028 Barcelona (Spain); Jezek, D. M. [IFIBA-CONICET and Departamento de Fisica, FCEN-UBA Pabellon 1, Ciudad Universitaria, 1428 Buenos Aires (Argentina)

2011-09-15T23:59:59.000Z

406

Experimental Study on Fluid Mixing for Evaluation of Thermal Striping in T-Pipe Junction  

SciTech Connect (OSTI)

A water experiment is performed to investigate thermal striping phenomena in a T-pipe junction which is a typical geometry of fluid mixing. The flow velocity ratio and temperature difference were experimental parameters. The jet form was classified into four patterns; (1) impinging jet, (2) deflecting jet, (3) re-attachment jet and (4) wall jet according to the inflow condition. The parameter experiments showed that the jet form could be predicted by a momentum ratio between the two pipes. The thermo-chromic liquid crystal sheet showed that a cold spot was formed at the wall surface in the main pipe in the cases of the impinging jet and the wall jet. From the temperature measurement in the fluid, temperature fluctuation intensity was high along the edge of the jet exiting from branch piping. A database of temperature fluctuation and frequency characteristics was established for an evaluation rule of thermal striping in a T-pipe junction. (authors)

Minoru Igarashi; Masaaki Tanaka; Hideki Kamide [Japan Nuclear Cycle Development Institute 4002, Narita, O-arai, Ibaraki 311-1393 (Japan); Shigeyo Kawashima [Nuclear Energy System Incorporation (Japan)

2002-07-01T23:59:59.000Z

407

Negative differential resistance behavior in phosphorus-doped armchair graphene nanoribbon junctions  

SciTech Connect (OSTI)

In this present work, we investigate the electronic transport properties of phosphorus-doped armchair graphene nanoribbon (AGNR) junctions by employing nonequilibrium Green's functions in combination with the density-function theory. Two phosphorus (P) atoms are considered to substitute the central carbon atom with the different width of AGNRs. The results indicate that the electronic transport behaviors are strongly dependent on the width of the P-doped graphene nanoribbons. The current-voltage characteristics of the doped AGNR junctions reveal an interesting negative differential resistance (NDR) and exhibit three distinct family (3 n, 3 n + 1, 3 n + 2) behaviors. These results display that P doping is a very good way to achieve NDR of the graphene nanoribbon devices.

Zhou, Yuhong [School of Optical and Electronic Information, Huazhong University of Science and Technology, No. 1037 Luoyu Road, Hongshan District, Wuhan City, Hubei Province 430074 (China); Wenhua College, Huzhong University of Science and Technology, Wuhan City, Hubei Province 430074 (China); Zhang, Daoli, E-mail: zhang-daoli@hust.edu.cn; Zhang, Jianbing; Miao, Xiangshui [School of Optical and Electronic Information, Huazhong University of Science and Technology, No. 1037 Luoyu Road, Hongshan District, Wuhan City, Hubei Province 430074 (China); Wuhan National Laboratory for Optoelectronics, 1037 Luoyu Road, Hongshan District, Wuhan City, Hubei Province 430074 (China); Ye, Cong [Faculty of Physics and Electronic Technology, Hubei University, Wuhan 430062 (China)

2014-02-21T23:59:59.000Z

408

Phase-slippage and self-trapping in a self-induced bosonic Josephson junction  

E-Print Network [OSTI]

A dipolar condensate confined in a toroidal trap constitutes a self-induced Josepshon junction when the dipoles are oriented perpendicularly to the trap symmetry axis and the s-wave scattering length is small enough. The ring-shaped double-well potential coming from the anisotropic character of the mean-field dipolar interaction is robust enough to sustain self-trapping dynamics, which takes place when the initial population imbalance between the two wells is large. We show that in this system the self-trapping regime is directly related to a vortex-induced phase-slip dynamics. A vortex and antivortex are spontaneously nucleated in the low density regions, before a minimum of the population imbalance is reached, and then cross the toroidal section in opposite directions through the junctions.This vortex dynamics yields a phase slip between the two weakly linked condensates causing an inversion of the particle flux.

Abad, M; Mayol, R; Pi, M; Jezek, D M

2011-01-01T23:59:59.000Z

409

Characterization of the microdialysis junction interface for capillary electrophoresis/microelectrospray ionization mass spectrometry  

SciTech Connect (OSTI)

A capillary electrophoresis/electrospray ionization mass spectrometry (CE/ESI-MS) interface, based on an electric circuit across a microdialysis membrane surrounding a short capillary segment closely connected to the separation capillary terminus, is demonstrated to be sensitive, efficient, and rugged. A microspray type ionization emitter produces a stable electrospray at the low flow rates provided by CE and thus avoids both the need for a makeup liquid flow provided by liquid junction or sheath flow interfaces and the subsequent dilution and reduction in sensitivity. Reproducibility studies and comparisons with CE/UV and the CE/sheath flow interface with ESI-MS are presented. Additionally, postrun acidification via the microdialysis junction interface is demonstrated and shown to be capable of denaturing the holomyoglobin protein noncovalent complex while maintaining separation efficiency. 21 refs., 7 figs., 1 tab.

Severs, J.C.; Smith, R.D. [Pacific Northwest National Lab., Richland, WA (United States)] [Pacific Northwest National Lab., Richland, WA (United States)

1997-06-01T23:59:59.000Z

410

Spin-Polarized Tunneling Spectroscopy in Tunnel Junctions with Half-Metallic Electrodes  

Science Journals Connector (OSTI)

We have studied the magnetoresistance (TMR) of tunnel junctions with electrodes of La2/3Sr1/3MnO3 and we show how the variation of the conductance and TMR with the bias voltage can be exploited to obtain precise information on the spin and energy dependence of the density of states. Our analysis leads to a quantitative description of the band structure of La2/3Sr1/3MnO3 including the energy gap ? between the Fermi level and the bottom of the t2g minority-spin band, in good agreement with data from spin-polarized inverse photoemission experiments. This shows the potential of magnetic tunnel junctions with half-metallic electrodes for spin-resolved spectroscopic studies.

M. Bowen, A. Barthlmy, M. Bibes, E. Jacquet, J.-P. Contour, A. Fert, F. Ciccacci, L. Du, and R. Bertacco

2005-09-21T23:59:59.000Z

411

Adiabatic Mach-Zehnder Interferometry on a Quantized Bose-Josephson Junction  

SciTech Connect (OSTI)

We propose a scheme to achieve Mach-Zehnder interferometry using a quantized Bose-Josephson junction with a negative charging energy. The quantum adiabatic evolution through a dynamical bifurcation is used to accomplish the beam splitting and recombination. The negative charging energy ensures the existence of a path-entangled state which enhances the phase measurement precision to the Heisenberg limit. A feasible detection procedure is also presented. The scheme should be realizable with current technology.

Lee, Chaohong [Nonlinear Physics Centre and ARC Centre of Excellence for Quantum-Atom Optics, Research School of Physical Sciences and Engineering, Australian National University, Canberra ACT 0200 (Australia)

2006-10-13T23:59:59.000Z

412

Vortex motion rectification in Josephson junction arrays with a ratchet potential  

E-Print Network [OSTI]

By means of electrical transport measurements we have studied the rectified motion of vortices in ratchet potentials engineered on over-damped Josephson junction arrays. The rectified voltage as a function of the vortex density shows a maximum efficiency close a matching condition to the period of the ratchet potential indicating a collective vortex motion. Vortex current reversals where detected varying the driving force and vortex density revealing the influence of vortex-vortex interaction in the ratchet effect.

D. E. Shalom; H. Pastoriza

2004-11-19T23:59:59.000Z

413

Adiabatic Mach-Zehnder Interferometry on A Quantized Bose-Josephson Junction  

E-Print Network [OSTI]

We propose a scheme to achieve a Mach-Zehnder interferometry using a quantized Bose-Josephson junction with negative charging energy. The quantum adiabatic evolution through a dynamical bifurcation is used to accomplish the beam splitting and recombination. The negative charging energy ensures the existence of a path-entangled state which enhances the phase measurement precision to the Heisenberg limit. A feasible detection procedure is also presented. The scheme should be realizable with current technology.

Chaohong Lee

2006-09-14T23:59:59.000Z

414

Multi junction solar cells using band-gap induced cascaded light absorption  

Science Journals Connector (OSTI)

We propose multi junction solar cells using an optical reflection system formed by arranging plural solar cells in decreasing order of their band gaps for achieving cascaded light absorption by their own band gaps: the first solar cell absorbs some light with a photon energy higher than the highest band gap and reflects the residual light with a lower photon energy to the second solar cell. We further propose to use plural batteries for charging electrical power generated by the individual solar cells to overcome the current matching problem in the multi-junction solar cells. We experimentally demonstrated reflection-type multi junction solar cells using commercially available hydrogenated amorphous silicon (a-Si:H) and crystalline silicon (c-Si) solar cells using air mass 1.5 light illumination. A high open circuit voltage of 24.3 V was achieved, which was a sum of 19.3 and 5.0 V for the individual a-Si:H and c-Si solar cells. However, since there was no current matching between the a-Si:H and c-Si solar cells, the a-Si:H?c-Si serially connected solar cell gave a maximum power of 0.057 W, which was lower than 0.063 W, the sum of those for the individual a-Si:H and c-Si solar cells. The method of charging electrical power from individual solar cells is useful to efficiently achieve electrical power from individual a-Si:H and c-Si solar cells in the absence of current matching in multi junction solar cells.

Toshiyuki Sameshima; Hitomi Nomura; Shinya Yoshidomi; Masahiko Hasumi

2014-01-01T23:59:59.000Z

415

DEVELOPMENT OF A HIGH EFFICIENCY MECHANICALLY STACKED MULTI-JUNCTION SOLAR CELL  

E-Print Network [OSTI]

Monolithic, 2-terminal, epitaxially grown multi-junctions represent the state-of-the-art in high efficiency photovoltaic space power. Their in-situ monolithic integration results in an elegant device structure with high efficiency, relatively high specific power, and a simple fabrication process. The monolithic, epitaxially grown nature of these devices also imposes materials and design restrictions which impede the march to significantly higher

Daniel Aiken; Paul Sharps; Mark Stan; Harry Atwater; Anna Fontcuberta I Morral; James Zahler; Mark Wanlass

416

OPTICAL ABSORPTION, PHOTOCONDUCTIVITY AND p-n JUNCTIONS IN CADMIUM TELLURIDE  

E-Print Network [OSTI]

217. OPTICAL ABSORPTION, PHOTOCONDUCTIVITY AND p-n JUNCTIONS IN CADMIUM TELLURIDE By B. M. VUL, V, Academy of Sciences, Moscow, USSR. Résumé. 2014 L'analyse des données expérimentales sur l'absorption considérable de l'absorption par exciton et du processus de la diffusion des excitons de la région

Paris-Sud XI, Université de

417

Onset of chaos and dc current-voltage characteristics of rf-driven Josephson junctions in the low-frequency regime  

Science Journals Connector (OSTI)

A comprehensive picture of the dc current-voltage (I-V) characteristics of rf-driven Josephson junctions in the low-frequency regime is presented. The boundary of the low-frequency regime is roughly defined by the junction characteristic frequency for overdamped junctions, and by the inverse of the junction damping time for underdamped junctions. An adiabatic model valid for the low-frequency regime is used to describe the overall shapes of the I-V curves, which is in good agreement with both the numerical simulations and the experimental results. For underdamped junctions, the Shapiro steps are the prominent features on the I-V curves if the rf frequency is sufficiently below the boundary. As the rf frequency is increased towards the boundary, large negatively-going tails on top of the Shapiro steps are observed both experimentally and numerically. Numerical simulations using the resistively- and capacitively-shunted-junction model (RCSJ model) reveal that the negatively-going tail is a signature of the low-frequency boundary of the junction chaotic regime. With use of the adiabatic model and the existence of plasma oscillations for underdamped junctions, the onset of chaos and its effect on the Shapiro steps can be fully explained. The high-frequency limit of the adiabatic model and the chaotic behavior of the Josephson junctions beyond the low-frequency regime are also briefly discussed.

C. C. Chi and C. Vanneste

1990-12-01T23:59:59.000Z

418

Stability of dynamic coherent states in intrinsic Josephson-junction stacks near internal cavity resonance.  

SciTech Connect (OSTI)

Stacks of intrinsic Josephson junctions in the resistive state can by efficiently synchronized by the internal cavity mode resonantly excited by the Josephson oscillations. We study the stability of dynamic coherent states near the resonance with respect to small perturbations. Three states are considered: the homogeneous and alternating-kink states in zero magnetic field and the homogeneous state in the magnetic field near the value corresponding to half flux quantum per junction. We found two possible instabilities related to the short-scale and long-scale perturbations. The homogeneous state in modulated junction is typically unstable with respect to the short-scale alternating phase deformations unless the Josephson current is completely suppressed in one half of the stack. The kink state is stable with respect to such deformations and homogeneous state in the magnetic field is only stable within a certain range of frequencies and fields. Stability with respect to the long-range deformations is controlled by resonance excitations of fast modes at finite wave vectors and typically leads to unstable range of the wave vectors. This range shrinks with approaching the resonance and increasing the in-plane dissipation. As a consequence, in finite-height stacks the stability frequency range near the resonance increases with decreasing the height.

Koshelev, A. E.; Materials Science Division

2010-11-16T23:59:59.000Z

419

Josephson junction-embedded transmission-line resonators: from Kerr medium to in-line transmon  

E-Print Network [OSTI]

We provide a general method to find the Hamiltonian of a linear circuit in the presence of a nonlinearity. Focussing on the case of a Josephson junction embedded in a transmission-line resonator, we solve for the normal modes of the system by taking into account exactly the effect of the quadratic (i.e. inductive) part of the Josephson potential. The nonlinearity is then found to lead to self and cross-Kerr effect, as well as beam-splitter type interactions between modes. By adjusting the parameters of the circuit, the Kerr coefficient K can be made to reach values that are weak (K \\kappa) or even very strong (K >> \\kappa) with respect to the photon-loss rate \\kappa. In the latter case, the resonator+junction circuit corresponds to an in-line version of the transmon. By replacing the single junction by a SQUID, the Kerr coefficient can be tuned in-situ, allowing for example the fast generation of Schr\\"odinger cat states of microwave light. Finally, we explore the maximal strength of qubit-resonator coupling...

Bourassa, J; Gambetta, Jay M; Blais, A

2012-01-01T23:59:59.000Z

420

Effect of phase noise on quantum correlations in Bose-Josephson junctions  

SciTech Connect (OSTI)

In a two-mode Bose-Josephson junction the dynamics induced by a sudden quench of the tunnel amplitude leads to the periodic formation of entangled states. For instance, squeezed states are formed at short times and macroscopic superpositions of phase states at later times. In atom interferometry, the two modes of the junction play the role of the two arms of a Mach-Zehnder interferometer; use of multiparticle entangled states allows the enhancement of phase sensitivity with respect to that obtained from uncorrelated atoms. Decoherence due to the presence of noise degrades quantum correlations between atoms, thus reducing phase sensitivity. We consider decoherence due to stochastic fluctuations of the energies of the two modes of the junction. We analyze its effect on squeezed states and macroscopic superpositions and calculate the squeezing parameter and the quantum Fisher information during the quenched dynamics. The latter quantity measures the amount of quantum correlations useful in interferometry. For moderate noise intensities, we show that it increases on time scales beyond the squeezing regime. This suggests multicomponent superpositions of phase states as interesting candidates for high-precision atom interferometry.

Ferrini, G.; Minguzzi, A.; Hekking, F. W. J. [Universite Grenoble 1 and CNRS, Laboratoire de Physique et Modelisation des Milieux Condenses UMR5493, B.P. 166, F-38042 Grenoble (France); Spehner, D. [Universite Grenoble 1 and CNRS, Laboratoire de Physique et Modelisation des Milieux Condenses UMR5493, B.P. 166, F-38042 Grenoble (France); Universite Grenoble 1 and CNRS, Institut Fourier UMR5582, B.P. 74, F-38402 Saint Martin d'Heres (France)

2011-10-15T23:59:59.000Z

Note: This page contains sample records for the topic "junction greenfield grundy" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

Commensurability effects in a Josephson tunnel junction in the field of an array of magnetic particles  

SciTech Connect (OSTI)

Commensurability effects have been theoretically studied in a hybrid system consisting of a Josephson junction located in a nonuniform field induced by an array of magnetic particles. A periodic phase-difference distribution in the junction that is caused by the formation of a regular lattice of Abrikosov vortices generated by the magnetic field of the particles in superconducting electrodes is calculated. The dependence of the critical current through the junction I{sub c} on the applied magnetic field H is shown to differ strongly from the conventional Fraunhofer diffraction pattern because of the periodic modulation of the Josephson phase difference created by the vortices. More specifically, the I{sub c}(H) pattern contains additional resonance peaks, whose positions and heights depend on the parameters and magnetic state of the particles in the array. These specific features of the I{sub c}(H) dependence are observed when the period of the Josephson current modulation by the field of the magnetic particles and the characteristic scale of the change in the phase difference by the applied magnetic field are commensurable. The conditions that determine the positions of the commensurability peaks are obtained, and they are found to agree well with experimental results.

Samokhvalov, A. V. [Russian Academy of Sciences, Institute for Physics of Microstructures (Russian Federation)], E-mail: samokh@ipm.sci-nnov.ru

2007-03-15T23:59:59.000Z

422

Pi-Josephson Junction and Spontaneous Superflow in Rings from Ultracold Fermionic Atomic Gases  

E-Print Network [OSTI]

The BCS-like pairing in ultracold fermionic atomic ($UCFAG$) gases is studied in the model of "isotopic-spin" pairing proposed in 1991 \\cite% {Ku-Hof-SSC}. This model assumes a mismatch ($\\delta $) in chemical potentials of pairing fermionic atoms. It is shown that a $\\pi $-Josephson junction can be realized in $UCFAG$ systems, where the left and right banks $% S$ are the $UCFAG$ superfluids. The weak link $M$ consists from the normal $% UCFAG$ with the finite mismatch $\\delta $. If the $\\pi $-junction is a part of a closed ring the superfluid mass-current flows spontaneously in the ring, i.e., the time-reversal symmetry is broken spontaneously. This is realized if the radius of the ring $R$ is larger than the critical one $% R_{c} $. All these effects exist also in the case when $\\delta \\gg \\Delta $, where $\\Delta $ is the superfluid gap, but with the reduced thickness of the weak link. It is also discussed, that if junctions $SM_{1}M_{2}S$ and trilayers $% M_{1}SM_{2}$ from $UCFAG$ are realizable this renders a possibility for a novel electronics - \\textit{hypertronics}.

Miodrag L. Kulic

2006-06-07T23:59:59.000Z

423

A review on plasma-assisted VLS synthesis of silicon nanowires and radial junction solar cells  

Science Journals Connector (OSTI)

Incorporation of nanostructures is a recent trend in the photovoltaic community, aimed at improving light absorption and consequently cell efficiency. In this regard, semiconductor nanowires provide an attractive research platform for a new generation of cost-effective and efficient solar cells. Thanks to their unique geometry, silicon nanowires enhance light trapping and anti-reflection effects by means of multiple scattering between individual nanowires, and by coupling the light into confined eigenmodes over a broad range of the solar spectrum. Moreover, radial junction solar cells built around nanowires decouple the light absorption and carrier collection directions, which allows for a higher internal field and better carrier collection. Thus, arrays of radial junction solar cells bring advantages of high efficiency with reduced material amount. This is particularly attractive for devices based on hydrogenated amorphous and microcrystalline silicon thin films. In this paper, after reviewing different approaches to fabricate silicon nanowires, we focus on nanowires grown using the plasma-assisted vapourliquidsolid method because of the simplicity and compatibility with current silicon thin-film technology. Their application to a-Si?:?H based radial junction solar cells has already resulted in ~8% of stable devices with an absorber layer thickness of only 100nm. Moreover, current challenges and perspectives such as the use of a microcrystalline silicon absorber are also reviewed.

Soumyadeep Misra; Linwei Yu; Wanghua Chen; Martin Foldyna; Pere Roca i Cabarrocas

2014-01-01T23:59:59.000Z

424

Physical model of the contact resistivity of metal-graphene junctions  

SciTech Connect (OSTI)

While graphene-based technology shows great promise for a variety of electronic applications, including radio-frequency devices, the resistance of the metal-graphene contact is a technological bottleneck for the realization of viable graphene electronics. One of the most important factors in determining the resistance of a metal-graphene junction is the contact resistivity. Despite the large number of experimental works that exist in the literature measuring the contact resistivity, a simple model of it is still lacking. In this paper, we present a comprehensive physical model for the contact resistivity of these junctions, based on the Bardeen Transfer Hamiltonian method. This model unveils the role played by different electrical and physical parameters in determining the specific contact resistivity, such as the chemical potential of interaction, the work metal-graphene function difference, and the insulator thickness between the metal and graphene. In addition, our model reveals that the contact resistivity is strongly dependent on the bias voltage across the metal-graphene junction. This model is applicable to a wide variety of graphene-based electronic devices and thus is useful for understanding how to optimize the contact resistance in these systems.

Chaves, Ferney A., E-mail: ferneyalveiro.chaves@uab.cat; Jimnez, David [Departament d'Enginyeria Electrnica, Escola d'Enginyeria, Universitat Autnoma de Barcelona, Campus UAB, 08193 Bellaterra, Barcelona (Spain); Cummings, Aron W. [ICN2Institut Catal de Nanocincia i Nanotecnologia, Campus UAB, 08193 Bellaterra, Barcelona (Spain); Roche, Stephan [ICN2Institut Catal de Nanocincia i Nanotecnologia, Campus UAB, 08193 Bellaterra, Barcelona (Spain); ICREA, Instituci Catalana de Recerca i Estudis Avanats, 08070 Barcelona (Spain)

2014-04-28T23:59:59.000Z

425

Building America Whole-House Solutions for New Homes: Rural Development, Inc., Greenfield, Massachusetts  

Broader source: Energy.gov [DOE]

Case study of Rural Development Inc. who worked with Building America research partner CARB to design affordable HERS-8 homes (60 w/o PV), with double-stud walls heavy insulation, low-load sealed-combustion gas space heaters, triple-pane windows, solar water heating, and PV.

426

Building America Whole-House Solutions for Existing Homes: Conway Street Apartments- Greenfield, Massachusetts  

Broader source: Energy.gov [DOE]

Through recent research efforts, CARB has been evaluating strategies and technologies that can make dramatic improvements in energy performance in multifamily buildings. In this project, the team helped to transform a 100-year-old empty school building into 12 high performance apartments with low energy costs. The advanced features included an excellent thermal envelope of closed-cell spray foam and triple-pane windows, ductless heat pumps, solar thermal hot water system, and photovoltaic system.

427

Polychlorinated biphenyl spatial patterns in San Francisco Bay forage fish Ben K. Greenfield  

E-Print Network [OSTI]

analysis Spatial distribution Bioaccumulation a b s t r a c t Industrialized waterways frequently contain targeted sites near historically polluted locations and 17 probabilisti- cally chosen sites representative-Kandarakis et al., 2009). Sport fish contamination by to- tal PCBs and PCBs with dioxin-like properties poses

428

Polychlorinated biphenyl spatial patterns in San Francisco Bay forage fish Ben K. Greenfield  

E-Print Network [OSTI]

Available online xxxx Keywords: Polychlorinated biphenyl Fish Sediment Principal component analysis Spatial silverside (Menidia audens) contam- ination was compared between 12 targeted sites near historically polluted- tal PCBs and PCBs with dioxin-like properties poses elevated risk of carcinogenic effects to humans

429

Building America Case Study: Conway Street Apartments, Greenfield, Massachusetts (Fact Sheet)  

SciTech Connect (OSTI)

While single-family, detached homes account for 63% of households (EIA 2009); multi-family homes account for a very large portion of that remaining housing stock, and this fraction is growing. Through recent research efforts, CARB has been evaluating strategies and technologies that can make dramatic improvements in energy performance in multi-family buildings

Not Available

2014-12-01T23:59:59.000Z

430

RDI Development: Wisdom Way Solar Village, Greenfield, Massachusetts Field Test Report  

SciTech Connect (OSTI)

NREL, Mountain Energy Partnership, and the Consortium of Advanced Residential Buildings conducted field tests on a house in Wisdom Way Solar Village to verify energy efficiency.

Fang, X.; Hancock, E.

2009-05-01T23:59:59.000Z

431

Two-Dimensional Measurement of n+-p Asymmetrical Junctions in Multicrystalline Silicon Solar Cells Using AFM-Based Electrical Techniques with Nanometer Resolution: Preprint  

SciTech Connect (OSTI)

Lateral inhomogeneities of modern solar cells demand direct electrical imaging with nanometer resolution. We show that atomic force microscopy (AFM)-based electrical techniques provide unique junction characterizations, giving a two-dimensional determination of junction locations. Two AFM-based techniques, scanning capacitance microscopy/spectroscopy (SCM/SCS) and scanning Kelvin probe force microscopy (SKPFM), were significantly improved and applied to the junction characterizations of multicrystalline silicon (mc-Si) cells. The SCS spectra were taken pixel by pixel by precisely controlling the tip positions in the junction area. The spectra reveal distinctive features that depend closely on the position relative to the electrical junction, which allows us to indentify the electrical junction location. In addition, SKPFM directly probes the built-in potential over the junction area modified by the surface band bending, which allows us to deduce the metallurgical junction location by identifying a peak of the electric field. Our results demonstrate resolutions of 10-40 nm, depending on the techniques (SCS or SKPFM). These direct electrical measurements with nanometer resolution and intrinsic two-dimensional capability are well suited for investigating the junction distribution of solar cells with lateral inhomogeneities.

Jiang, C. S.; Moutinho, H. R.; Li, J. V.; Al-Jassim, M. M.; Heath, J. T.

2011-07-01T23:59:59.000Z

432

Quantum and classical resonant escapes of a strongly driven Josephson junction  

SciTech Connect (OSTI)

The properties of phase escape in a dc superconducting quantum interference device (SQUID) at 25 mK, which is well below quantum-to-classical crossover temperature T{sub cr}, in the presence of strong resonant ac driving have been investigated. The SQUID contains two Nb/Al-AlO{sub x}/Nb tunnel junctions with Josephson inductance much larger than the loop inductance so it can be viewed as a single junction having adjustable critical current. We find that with increasing microwave power W and at certain frequencies nu and nu/2, the single primary peak in the switching current distribution, which is the result of macroscopic quantum tunneling of the phase across the junction, first shifts toward lower bias current I and then a resonant peak develops. These results are explained by quantum resonant phase escape involving single and two photons with microwave-suppressed potential barrier. As W further increases, the primary peak gradually disappears and the resonant peak grows into a single one while shifting further to lower I. At certain W, a second resonant peak appears, which can locate at very low I depending on the value of nu. Analysis based on the classical equation of motion shows that such resonant peak can arise from the resonant escape of the phase particle with extremely large oscillation amplitude resulting from bifurcation of the nonlinear system. Our experimental result and theoretical analysis demonstrate that at T<

Yu, H. F.; Zhu, X. B.; Peng, Z. H.; Cao, W. H.; Cui, D. J.; Tian, Ye; Chen, G. H.; Zheng, D. N.; Jing, X. N.; Lu, Li; Zhao, S. P.; Han Siyuan [Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China); Department of Physics and Astronomy, University of Kansas, Lawrence, Kansas 66045 (United States)

2010-04-01T23:59:59.000Z

433

Non-equilibrium coherent vortex states and subharmonic giant Shapiro steps in Josephson junction arrays  

E-Print Network [OSTI]

This is a review of recent work on the dynamic response of Josephson junction arrays driven by dc and ac currents. The arrays are modeled by the resistively shunted Josephson junction model, appropriate for proximity effect junctions, including self-induced magnetic fields as well as disorder. The relevance of the self-induced fields is measured as a function of a parameter $\\kappa=\\lambda_L/a$, with $\\lambda_L$ the London penetration depth of the arrays, and $a$ the lattice spacing. The transition from Type II ($\\kappa>1$) to Type I ($\\kappa <1$) behavior is studied in detail. We compare the results for models with self, self+nearest-neighbor, and full inductance matrices. In the $\\kappa=\\infty$ limit, we find that when the initial state has at least one vortex-antivortex pair, after a characteristic transient time these vortices unbind and {\\it radiate} other vortices. These radiated vortices settle into a parity-broken, time-periodic, {\\em axisymmetric coherent vortex state} (ACVS), characterized by alternate rows of positive and negative vortices lying along a tilted axis. The ACVS produces subharmonic steps in the current voltage (IV) characteristics, typical of giant Shapiro steps. For finite $\\kappa$ we find that the IV's show subharmonic giant Shapiro steps, even at zero external magnetic field. We find that these subharmonic steps are produced by a whole family of coherent vortex oscillating patterns, with their structure changing as a function of $\\kappa$. In general, we find that these patterns are due to a break down of translational invariance produced, for example, by disorder or antisymmetric edge-fields. The zero field case results are in good qualitative agreement with experiments

Daniel Domnguez; Jorge V. Jos

1994-07-11T23:59:59.000Z

434

Nonsinusoidal current-phase relation in strongly ferromagnetic and moderately disordered SFS junctions  

Science Journals Connector (OSTI)

We study the Josephson current in a junction comprising two superconductors linked by a strong ferromagnet in presence of impurities. We focus on a regime where the electron (and hole) motion is ballistic over the exchange length and diffusive on the scale of the weak link length. The first and the second harmonics of the current-phase relation are obtained for both two- and three-dimensional ferromagnetic weak links. In the clean limit, the possibility of temperature-induced 0-? transitions is demonstrated. The corresponding critical current versus temperature dependence is also studied.

Francois Konschelle; Jrme Cayssol; Alexandre I. Buzdin

2008-10-07T23:59:59.000Z

435

Asymmetric current-phase relation due to spin-orbit interaction in semiconductor nanowire Josephson junction  

SciTech Connect (OSTI)

We theoretically study the current-phase relation in semiconductor nanowire Josephson junction in the presence of spin-orbit interaction. In the nanowire, the impurity scattering with strong SO interaction is taken into account using the random matrix theory. In the absence of magnetic field, the Josephson current I and phase difference ? between the superconductors satisfy the relation of I(?) = I(?). In the presence of magnetic field along the nanowire, the interplay between the SO interaction and Zeeman effect breaks the current-phase relation of I(?) = I(?). In this case, we show that the critical current depends on the current direction, which qualitatively agrees with recent experimental findings.

Yokoyama, Tomohiro; Eto, Mikio [Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522 (Japan); Nazarov, Yuli V. [Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands (Netherlands)

2013-12-04T23:59:59.000Z

436

Realization of Fully Frustrated Josephson-Junction Arrays with Cold Atoms  

SciTech Connect (OSTI)

Fully frustrated Josephson-junction arrays (FF-JJA's) exhibit a subtle compound phase transition in which an Ising transition associated with discrete broken translational symmetry and a Berezinskii-Kosterlitz-Thouless transition associated with quasi-long-range phase coherence occur nearly simultaneously. In this Letter we discuss a cold-atom realization of the FF-JJA system. We demonstrate that both orders can be studied by standard momentum-distribution-function measurements and present numerical results, based on a successful self-consistent spin-wave approximation, that illustrate the expected behavior of observables.

Polini, Marco; Fazio, Rosario; Tosi, M.P. [NEST-INFM and Classe di Scienze, Scuola Normale Superiore, I-56126 Pisa (Italy); MacDonald, A.H. [Physics Department, The University of Texas at Austin, Austin, Texas 78712 (United States)

2005-07-01T23:59:59.000Z

437

Two-Point Phase Correlations of a One-Dimensional Bosonic Josephson Junction  

SciTech Connect (OSTI)

We realize a one-dimensional Josephson junction using quantum degenerate Bose gases in a tunable double well potential on an atom chip. Matter wave interferometry gives direct access to the relative phase field, which reflects the interplay of thermally driven fluctuations and phase locking due to tunneling. The thermal equilibrium state is characterized by probing the full statistical distribution function of the two-point phase correlation. Comparison to a stochastic model allows us to measure the coupling strength and temperature and hence a full characterization of the system.

Betz, T.; Manz, S.; Buecker, R.; Berrada, T.; Koller, Ch.; Schmiedmayer, J. [Vienna Center for Quantum Science and Technology, Atominstitut, TU-Wien, 1020 Vienna (Austria); Kazakov, G. [Wolfgang Pauli Institute, University of Vienna, 1090 Vienna (Austria); St. Petersburg State Polytechnic University, 195251 St. Petersburg (Russian Federation); Mazets, I. E. [Vienna Center for Quantum Science and Technology, Atominstitut, TU-Wien, 1020 Vienna (Austria); Wolfgang Pauli Institute, University of Vienna, 1090 Vienna (Austria); Ioffe Physico-Technical Institute, 194021 St. Petersburg (Russian Federation); Stimming, H.-P. [Wolfgang Pauli Institute, University of Vienna, 1090 Vienna (Austria); Perrin, A.; Schumm, T. [Vienna Center for Quantum Science and Technology, Atominstitut, TU-Wien, 1020 Vienna (Austria); Wolfgang Pauli Institute, University of Vienna, 1090 Vienna (Austria)

2011-01-14T23:59:59.000Z

438

The effect of a laser dip in the semiclassical dynamics of bosonic Josephson Junctions  

E-Print Network [OSTI]

We consider the standard double well setup extended with a laser beam in the center to create a "triple well" potential. The beam in the center is much more narrow than the barrier, and it creates a tunable depth well which can support a localized state in the middle. We show that the presence of the localized state in the central well changes the sign of tunneling between the left and right wells and therefore controls the fixed point dynamics of the bosonic Josephson junction.

Gergely Szirmai; Giovanni Mazzarella; Luca Salasnich

2014-06-06T23:59:59.000Z

439

Fabrication of submicron La$_{2-x}$Sr$_{x}$CuO$_{4}$ intrinsic Josephson junction stacks  

E-Print Network [OSTI]

Intrinsic Josephson junction (IJJ) stacks of cuprate superconductors have potential to be implemented as intrinsic phase qubits working at relatively high temperatures. We report success in fabricating submicron La$_{2-x}$Sr$_{x}$CuO$_{4}$ (LSCO) IJJ stacks carved out of single crystals. We also show a new fabrication method in which argon ion etching is performed after focused ion beam etching. As a result, we obtained an LSCO IJJ stack in which resistive multi-branches appeared. It may be possible to control the number of stacked IJJs with an accuracy of a single IJJ by developing this method.

Kubo, Yuimaru; Tanaka, Takayoshi; Ueda, Shinya; Ishii, Satoshi; Tsuda, Shunsuke; Islam, A T M Nazmul; Tanaka, Isao; Takano, Yoshihiko; 10.1063/1.3544037

2011-01-01T23:59:59.000Z

440

A conformal field theory description of magnetic flux fractionalization in Josephson junction ladders  

E-Print Network [OSTI]

We show how the recently proposed effective theory for a Quantum Hall system at "paired states" filling v=1 (Mod. Phys. Lett. A 15 (2000) 1679; Nucl. Phys. B641 (2002) 547), the twisted model (TM), well adapts to describe the phenomenology of Josephson Junction ladders (JJL) in the presence of defects. In particular it is shown how naturally the phenomenon of flux fractionalization takes place in such a description and its relation with the discrete symmetries present in the TM. Furthermore we focus on closed geometries, which enable us to analyze the topological properties of the ground state of the system in relation to the presence of half flux quanta.

G. Cristofano; V. Marotta; A. Naddeo; G. Niccoli

2005-09-30T23:59:59.000Z

Note: This page contains sample records for the topic "junction greenfield grundy" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

Interconversion of dark soliton and Josephson vortex in a quasi-1D long Bose Josephson junction  

E-Print Network [OSTI]

Dark soliton (DS) and Josephson vortex (JV) in quasi-1D long Bose Josephson junction (BJJ) can be interconverted by tuning Josephson coupling. Rates of the interconversion as well as of the thermally activated phase-slip effect, resulting in the JV switching its vorticity, have been evaluated. The role of quantum phase-slip in creating superposition of JVs with opposite vorticities as a qubit is discussed as well. Utilization of the JV for controlled and coherent transfer of atomic Bose-Einstein condensate (BEC) is suggested.

V. M. Kaurov; A. B. Kuklov

2004-06-15T23:59:59.000Z

442

The electronic structure of an S-pair in barrier-less metal/silicon junctions  

SciTech Connect (OSTI)

With S atoms doping into a bulk Si, it is revealed through first principles calculations that the highly S concentrated bulk Si is metallic. S atoms can be highly doped in the bulk Si because an S-pair located face to face in adjacent Si lattice sites gains a large energy and forms sp{sup 2} + p{sub z} electronic configurations and extra donor electrons. Schottky junction will be thus barrier-less by the Si metallization, well agreeing with experimental analyses.

Kato, K.; Nishi, Y.; Marukame, T.; Mitani, Y. [Advanced LSI Technology Laboratory, Toshiba Corporate R and D Center (Japan)

2013-12-04T23:59:59.000Z

443

0.7-eV GaInAs Junction for a GaInP/GaAs/GaInAs(1-eV)/GaInAs(0.7-eV) Four-Junction Solar Cell: Preprint  

SciTech Connect (OSTI)

We discuss recent developments in III-V multijunction solar cells, focusing on adding a fourth junction to the Ga0.5In0.5P/GaAs/Ga0.75In0.25As inverted three-junction cell. This cell, grown inverted on GaAs so that the lattice-mismatched Ga0.75In0.25As third junction is the last one grown, has demonstrated 38% efficiency, and 40% is likely in the near future. To achieve still further gains, a lower-bandgap GaxIn1-xAs fourth junction could be added to the three-junction structure for a four-junction cell whose efficiency could exceed 45% under concentration. Here, we present the initial development of the GaxIn1-xAs fourth junction. Junctions of various bandgaps ranging from 0.88 to 0.73 eV were grown, in order to study the effect of the different amounts of lattice mismatch. At a bandgap of 0.88 eV, junctions were obtained with very encouraging {approx}80% quantum efficiency, 57% fill factor, and 0.36 eV open-circuit voltage. The device performance degrades with decreasing bandgap (i.e., increasing lattice mismatch). We model the four-junction device efficiency vs. fourth junction bandgap to show that an 0.7-eV fourth-junction bandgap, while optimal if it could be achieved in practice, is not necessary; an 0.9-eV bandgap would still permit significant gains in multijunction cell efficiency while being easier to achieve than the lower-bandgap junction.

Friedman, D. J.; Geisz, J. F.; Norman, A. G.; Wanlass, M. W.; Kurtz, S. R.

2006-05-01T23:59:59.000Z

444

Analyzing carrier escape mechanisms in InAs/GaAs quantum dot p-i-n junction photovoltaic cells  

Science Journals Connector (OSTI)

Intermediate band solar cells (IBSCs) are third-generation photovoltaic (PV) devices that can harvest sub-bandgap photons normally not absorbed in a single-junction solar cell. Despite the large increase in total solar energy conversion efficiency predicted for IBSC devices substantial challenges remain to realizing these efficiency gains in practical devices. We evaluate carrier escape mechanisms in an InAs/GaAs quantum dot intermediate band p-i-n junction PV device using photocurrent measurements under sub-bandgap illumination. We show that sub-bandgap photons generate photocurrent through a two-photon absorption process but that carrier trapping and retrapping limit the overall photocurrent. The results identify a key obstacle that must be overcome in order to realize intermediate band devices that outperform single junction photovoltaic cells.

S. Polly; S. M. Hubbard; M. F. Doty

2014-01-01T23:59:59.000Z

445

Optical and Electrical Properties of Al/(p)Bi{sub 2}S{sub 3} Schottky Junction  

SciTech Connect (OSTI)

Thin film Al/(p)Bi{sub 2}S{sub 3} Schottky junctions were prepared by vacuum evaporation under pressure 10{sup -6} Torr. The p-type Bi{sub 2}S{sub 3} thin films with acceptor concentration (3.36-7.33)x10{sup 16}/cm{sup 3} were obtained by evaporating 'In' along with Bi{sub 2}S{sub 3} powder and then annealing the films at 453K for 5 hours. Different junction-parameters such as ideality factor, barrier height, effective Richardson's constant, short-circuit current, etc. were determined from I-V characteristics. The junctions exhibited rectifying I-V characteristics and also photovoltaic effect. Ideality factor was found to decrease with the increase of temperature. Proper doping, annealing, and hydrogenation are necessary to reduce the series resistance so as to achieve high carrier efficiency. More works are being carried out in this direction.

Kachari, T. [Bongaigaon Polytechnic, Bongaigaog, Assam (India); Wary, G. [Department of Physics, Cotton College, Guwahati (India); Rahman, A. [Department of Physics, Gauhati University, Guwahati (India)

2010-06-29T23:59:59.000Z

446

Analysis of testing the single-fluxon dynamics in a long Josephson junction by a dissipative spot  

SciTech Connect (OSTI)

A change of the [ital I]-[ital V] characteristics of a long Josephson junction, operating in the zero-field single-fluxon regime, under the action of a hot spot'' (e.g., created by a focused electron beam) is calculated analytically by means of the perturbation theory, and also investigated numerically. The change of the average voltage at a given value of the bias current is calculated as a function of the hot spot-position. The overlap Josephson junction geometry is considered in detail, while the inline one is briefly discussed. A good accord between analytical and numerical results is found. The results are relevant for the interpretation of the low-temperature scanning electron microscopy experiments on imaging the fluxon dynamic states in a long Josephson junction.

Malomed, B.A. (Dipartimento di Fisica, Universita di Salerno, I-84801 Baronissi (Saudi Arabia) (Italy)); Ustinov, A.V. (Institute for Thin Films and Ion Technology, Research Centre (KFA), D-52425 Juelich (Germany))

1994-05-01T23:59:59.000Z

447

Interface properties of GaInP/Ge hetero-structure sub-cells of multi-junction solar cells  

Science Journals Connector (OSTI)

The interface properties of the GaInP/Ge hetero-structure solar cells were studied. It was found that an undesirable potential barrier for the majority carriers could occur at the n-GaInP/n-Ge hetero-interface during the growth of multi-junction solar cells. The potential barrier at the GaInP/Ge interface leads to S-shape behaviour of I?V curves at low temperatures, which was observed either for the single junctions or for the multi-junction solar cells containing the n-GaInP/n-Ge interface. The values of the effective barrier height and width as 0.12???0.05?eV and 45?55?nm, respectively, were estimated by admittance spectroscopy and by C?V profiling measurements.

A S Gudovskikh; K S Zelentsov; N A Kalyuzhnyy; V V Evstropov; V M Lantratov; S A Mintairov

2012-01-01T23:59:59.000Z

448

Current amplifier and flux-buffer designs using an exponential flux shuttle with a Josephson junction synthetic inductor  

SciTech Connect (OSTI)

A current amplifier design based on the principle of fluxon propagation in a multi-junction Exponential Flux Shuttle has been investigated. In this design, the critical current of the junction is increased exponentially and the SQUID inductance is a JJ (Josephson Junction) equivalent inductance. Current gain can be achieved by generating fluxons at the low end and dissipating them at the high end where the load is located. Advantages over other types of linear devices are discussed. Two parallel Exponential Flux Shuttles can be used to duplicate flux from a high inductance input coil t a low inductance output. Device performance of the two circuits are evaluated by computer simulation, noise performance is discussed.

Gershenson, M.

1989-03-01T23:59:59.000Z

449

Electronic band alignment and electron transport in Cr/BaTiO{sub 3}/Pt ferroelectric tunnel junctions  

SciTech Connect (OSTI)

Electroresistance in ferroelectric tunnel junctions is controlled by changes in the electrostatic potential profile across the junction upon polarization reversal of the ultrathin ferroelectric barrier layer. Here, hard X-ray photoemission spectroscopy is used to reconstruct the electric potential barrier profile in as-grown Cr/BaTiO{sub 3}(001)/Pt(001) heterostructures. Transport properties of Cr/BaTiO{sub 3}/Pt junctions with a sub-{mu}m Cr top electrode are interpreted in terms of tunneling electroresistance with resistance changes of a factor of {approx}30 upon polarization reversal. By fitting the I-V characteristics with the model employing an experimentally determined electric potential barrier we derive the step height changes at the BaTiO{sub 3}/Pt (Cr/BaTiO{sub 3}) interface +0.42(-0.03) eV following downward to upward polarization reversal.

Zenkevich, A. [NRNU 'Moscow Engineering Physics Institute,' 115409 Moscow (Russian Federation) [NRNU 'Moscow Engineering Physics Institute,' 115409 Moscow (Russian Federation); Moscow Institute of Physics and Technology, Dolgoprudny, Moscow Region (Russian Federation); Minnekaev, M.; Matveyev, Yu.; Lebedinskii, Yu. [NRNU 'Moscow Engineering Physics Institute,' 115409 Moscow (Russian Federation)] [NRNU 'Moscow Engineering Physics Institute,' 115409 Moscow (Russian Federation); Bulakh, K.; Chouprik, A.; Baturin, A. [Moscow Institute of Physics and Technology, Dolgoprudny, Moscow Region (Russian Federation)] [Moscow Institute of Physics and Technology, Dolgoprudny, Moscow Region (Russian Federation); Maksimova, K. [Immanuel Kant Baltic Federal University, 236041 Kaliningrad (Russian Federation)] [Immanuel Kant Baltic Federal University, 236041 Kaliningrad (Russian Federation); Thiess, S.; Drube, W. [Deutsches Elektronen-Synchrotron DESY, D-22603 Hamburg (Germany)] [Deutsches Elektronen-Synchrotron DESY, D-22603 Hamburg (Germany)

2013-02-11T23:59:59.000Z

450

Thermal stability of Nb/a-Nb{sub x}Si{sub 1-x}/Nb Josephson junctions  

SciTech Connect (OSTI)

As a high-resistivity normal-metal barrier for superconducting Josephson junctions, metal-silicon alloys appear to be a good replacement for noble metals and have been applied to the development of quantum voltage standard circuits. We observed that the electrical properties of Nb-based junctions made with amorphous Nb{sub x}Si{sub 1-x} barriers were slowly evolving over time when stored at room temperature. After systematically investigating both junctions and thin films, we have concluded that the changes in junction electrical parameters are due to changes in the amorphous Nb{sub x}Si{sub 1-x} and not due to barrier-electrode interface effects. The resistivity of amorphous Nb{sub x}Si{sub 1-x} increases after heat treatment at temperatures as low as 80 deg. C when the Nb concentration is less than 33%, that of NbSi{sub 2}. Furthermore, we found that annealed barriers behave similarly to barriers with the Nb concentration intentionally reduced to obtain smaller critical current and larger normal resistance with the same barrier thickness, as explained by our I{sub c}-R{sub n} relation developed based on the dirty-limit superconductor-normal-metal-superconductor Josephson junction theory. To explain these effects, we adopt and corroborate a microscopic picture based on alloy phase stability that was previously demonstrated by others. We also successfully demonstrate a method to stabilize junctions made with Nb{sub x}Si{sub 1-x} barriers by intentionally annealing wafers during fabrication.

Baek, B.; Dresselhaus, P. D.; Benz, S. P. [National Institute of Standards and Technology, Boulder, Colorado 80305 (United States)

2007-02-01T23:59:59.000Z

451

Rapid Thermal Processing of High Efficiency n-Type Silicon Solar Cells with Al Back Junction  

SciTech Connect (OSTI)

In this paper we report on the design, fabrication and modeling of 49 cm{sup 2}, 200-{micro}m thick, 1-5 {Omega}-cm, n- and p-type <111> and <100> screen-printed silicon solar cells. A simple process involving RTP front surface phosphorus diffusion, low frequency PECVD silicon nitride deposition, screen-printing of Al metal and Ag front grid followed by co-firing of front and back contacts produced cell efficiencies of 15.4% on n-type <111> Si, 15.1% on n-type <100> Si, 15.8% on p-type <111> Si and 16.1% on p-type <100> Si. Open circuit voltage was comparable for n and p type cells and was also independent of wafer orientation. High fill factor values (0.771-0.783) for all the devices ruled out appreciable shunting which has been a problem for the development of co-fired n-type <100> silicon solar cells with Al back junction. Model calculations were performed using PC1D to support the experimental results and provide guidelines for achieving >17% n-type silicon solar cells by rapid firing of Al back junction.

Ebong, A.; Upadhyaya, V.; Rounsaville, B.; Kim, D. S.; Meemongkolkiat, V.; Rohatgi, A.; Al-Jassim, M. M.; Jones, K. M.; To, B.

2006-01-01T23:59:59.000Z

452

Linear arrays of Josephson junctions: A stability analysis of characteristic modes  

SciTech Connect (OSTI)

We have performed a linear stability analysis of two arrays of resistively shunted Josephson junctions: a ladder array and a so-called modified linear array. We find the periodic solutions to be linearly stable for a wide range of bias currents in the absence of a load. This is contrasted with the well-studied globally coupled linear array, where stability of the periodic solutions is a sensitive function of bias current and load parameters. For the ladder array, we have studied the nature of the mesh currents for the different decay modes. Numerical evidence leads us to conclude that the branches of the ladder parallel to the bias current play an important role in helping to damp out perturbed currents. We also compare the long-time dynamics of these Josephson-junction arrays with that of an RL network, which is a ladder of resistors and inductors, and for which the decay rates and mesh currents are calculated exactly. We find that {ital at long times} the dynamics of all three arrays are basically identical. {copyright} {ital 1998} {ital The American Physical Society}

Trees, B.R. [Department of Physics and Astronomy, Ohio Wesleyan University, Delaware, Ohio 43015 (United States)] [Department of Physics and Astronomy, Ohio Wesleyan University, Delaware, Ohio 43015 (United States); Harris, E.B. [Department of Physics, The Ohio State University, Columbus, Ohio 43210 (United States)] [Department of Physics, The Ohio State University, Columbus, Ohio 43210 (United States)

1998-03-01T23:59:59.000Z

453

Noise-induced dephasing of an ac-driven Josephson junction  

E-Print Network [OSTI]

We consider phase-locked dynamics of a Josephson junction driven by finite-spectral-linewidth ac current. By means of a transformation, the effect of frequency fluctuations is reduced to an effective additive noise, the corresponding (large) dephasing time being determined, in the logarithmic approximation, by the Kramers' expression for the lifetime. For sufficiently small values of the drive's amplitude, direct numerical simulations show agreement of the dependence of the dephasing activation energy on the ac-drive's spectral linewidth and amplitude with analytical predictions. Solving the corresponding Fokker-Planck equation analytically, we find a universal dependence of a critical value of the effective phase-diffusion parameter on the drive's amplitude at a point of a sharp transition from the phase-locked state to an unlocked one. For large values of the drive amplitude, saturation and subsequent decrease of the activation energy are revealed by simulations, which cannot be accounted for by the perturbative analysis. The same new effect is found for a previously studied case of ac-driven Josephson junctions with intrinsic thermal noise. The work was performed in the framework of a cooperation agreement between Consiglio Nazionale di Ricerca (Italy) and the Israeli Ministry of Science and Technology.

Giovanni Filatrella; Boris A. Malomed; Sergio Pagano

2002-03-28T23:59:59.000Z

454

Topologically protected qubits as minimal Josephson junction arrays with non trivial boundary conditions: a proposal  

E-Print Network [OSTI]

Recently a one-dimensional closed ladder of Josephson junctions has been studied (G. Cristofano et al., Phys. Lett. A 372 (2008) 2464) within a twisted conformal field theory (CFT) approach (G. Cristofano et al., Mod. Phys. Lett. A 15 (2000) 1679; Nucl. Phys. B 641 (2002) 547) and shown to develop the phenomenon of flux fractionalization (G. Cristofano et al., Eur. Phys. J. B 49 (2006) 83). That led us to predict the emergence of a topological order in such a system (G. Cristofano et al., JSTAT (2005) P03006). In this letter we analyze the ground states and the topological properties of fully frustrated Josephson junction arrays (JJA) arranged in a Corbino disk geometry for a variety of boundary conditions. In particular minimal configurations of fully frustrated JJA are considered and shown to exhibit the properties needed in order to build up a solid state qubit, protected from decoherence. The stability and transformation properties of the ground states of the JJA under adiabatic magnetic flux changes are analyzed in detail in order to provide a tool for the manipulation of the proposed qubit.

Gerardo Cristofano; Vincenzo Marotta; Adele Naddeo; Giuliano Niccoli

2008-10-16T23:59:59.000Z

455

Axisymmetric-coherent-vortex states in current-driven Josephson-junction arrays  

SciTech Connect (OSTI)

We present results from an extensive analysis of the dynamic response of Josephson-junction arrays driven by external currents of the form [ital I]=[ital I][sub dc]+[ital I][sub ac]sin(2[pi][nu][ital t]). The dynamics is given by the resistively shunted Josephson-junction model with Johnson noise. We find a stationary [ital axisymmetric][minus][ital coherent][minus][ital vortex] [ital state] (ACVS) away from equilibrium and above a minimum lattice size ([similar to]20[times]20) whenever the initial state has at least one antivortex and a vortex. The ACVS is characterized by tilted rows of oscillating positive and negative vortices, produced by the combined effect of the driving current plus the collective coupling of the nonlinear Josephson oscillators. The ACVS is manifested in the current-voltage characteristics as giant half-integer Shapiro steps, leading to period-two resonances in the spectral function. The stability and properties of the ACVS are studied as a function of frequency, temperature, disorder, edge magnetic fields, and lattice sizes. It is found that the ACVS is a very robust two-dimensional dynamical state that is produced under very diverse circumstances. A connection between the ACVS and half-integer steps seen in proximity effect arrays in zero field is also discussed.

Dominguez, D.; Jose, J.V. (Physics Department, Northeastern University, Boston, Massachusetts 02115 (United States))

1993-11-01T23:59:59.000Z

456

Lessons Learned: The Grand Junction Office Site Transfer to Private Ownership  

SciTech Connect (OSTI)

The U.S. Department of Energy Grand Junction Office (DOE?GJO) in Grand Junction, Colorado, has played an integral role within the DOE complex for many years. GJO has a reputation for outstanding quality in the performance of complex environmental restoration projects, utilizing state-of-the-art technology. Many of the GJO missions have been completed in recent years. In 1998, DOE Headquarters directed GJO to reduce its mortgage costs by transferring ownership of the site and to lease space at a reasonable rate for its ongoing work. A local community group and GJO have entered into a sales contract; signing of the Quitclaim Deed is planned for February 16, 2001. Site transfer tasks were organized as a project with a critical-path schedule to track activities and a Site Transition Decision Plan was prepared that included a decision process flow chart, key tasks, and responsibilities. Specifically, GJO identified the end state with affected parties early on, successfully dealt with site contamination issues, and negotiated a lease-back arrangement, resulting in an estimated savings of more than 60 percent of facility maintenance costs annually. Lessons learned regarding these transition activities could be beneficial to many other sites.

none,

2001-02-01T23:59:59.000Z

457

Hetero-junction photovoltaic device and method of fabricating the device  

DOE Patents [OSTI]

A hetero-junction device and fabrication method in which phase-separated n-type and p-type semiconductor pillars define vertically-oriented p-n junctions extending above a substrate. Semiconductor materials are selected for the p-type and n-type pillars that are thermodynamically stable and substantially insoluble in one another. An epitaxial deposition process is employed to form the pillars on a nucleation layer and the mutual insolubility drives phase separation of the materials. During the epitaxial deposition process, the orientation is such that the nucleation layer initiates propagation of vertical columns resulting in a substantially ordered, three-dimensional structure throughout the deposited material. An oxidation state of at least a portion of one of the p-type or the n-type semiconductor materials is altered relative to the other, such that the band-gap energy of the semiconductor materials differ with respect to stoichiometric compositions and the device preferentially absorbs particular selected bands of radiation.

Aytug, Tolga; Christen, David K; Paranthaman, Mariappan Parans; Polat, Ozgur

2014-02-10T23:59:59.000Z

458

Stability of single and tandem junction a-Si:H solar cells grown using the ECR process  

SciTech Connect (OSTI)

The authors report on the fabrication and stability tests of single junction a-Si:H, and tandem junction a-Si:H/A-Si:H solar cells using the ECR process under high hydrogen dilution (H-ECR process). They show that devices with high fill factors can be made using the H-ECR process. They also report on the stability studies of the solar cells under 1 and 2-sun illumination conditions. The solar cells show very little degradation even after 500 hours of illumination under 2 x sunlight illumination.

Dalal, V.L.; Maxson, T.; Girvan, R.; Haroon, S.

1997-07-01T23:59:59.000Z

459

Theory of two-dimensional macroscopic quantum tunneling in a Josephson junction coupled with an LC circuit  

E-Print Network [OSTI]

We investigate classical thermal activation (TA) and macroscopic quantum tunneling (MQT) for a Josephson junction coupled with an LC circuit theoretically. The TA and MQT escape rate are calculated analytically by taking into account the two-dimensional nature of the classical and quantum phase dynamics. We find that the MQT escape rate is largely suppressed by the coupling to the LC circuit. On the other hand, this coupling gives rise to slight reduction of the TA escape rate. These results are relevant for the interpretation of a recent experiment on the MQT and TA phenomena in grain boundary YBCO Josephson junctions.

Shiro Kawabata; Takeo Kato; Thilo Bauch

2009-12-17T23:59:59.000Z

460

A DLTS study of 4H-SiC-based p-n junctions fabricated by boron implantation  

SciTech Connect (OSTI)

Deep-level transient spectroscopy (DLTS) has been used to study p-n junctions fabricated by implantation of boron into epitaxial 4H-SiC films with n-type conductivity and the donor concentration (8-9) Multiplication-Sign 10{sup 14} cm{sup -3}. A DLTS signal anomalous in sign is observed; this signal is related to recharging of deep compensating boron-involved centers in the n-type region near the metallurgical boundary of the p-n junction.

Ivanov, P. A., E-mail: Pavel.Ivanov@mail.ioffe.ru; Potapov, A. S.; Samsonova, T. P. [Russian Academy of Sciences, Ioffe Physical Technical Institute (Russian Federation); Korol'kov, O.; Sleptsuk, N. [Tallinn University of Technology, Department of Electronics (Estonia)

2011-10-15T23:59:59.000Z

Note: This page contains sample records for the topic "junction greenfield grundy" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

Four-Junction Solar Cell with 40% Target Efficiency Fabricated by Wafer Bonding and Layer Transfer: Final Technical Report, 1 January 2005 - 31 December 2007  

SciTech Connect (OSTI)

We realized high-quality InGaP/GaAs 2-junction top cells on Ge/Si, InGaAs/InP bottom cells, direct-bond series interconnection of tandem cells, and modeling of bonded 3- and 4-junction device performance.

Atwater, H. A.

2008-11-01T23:59:59.000Z

462

Investigation of TiO{sub x} barriers for their use in hybrid Josephson and tunneling junctions based on pnictide thin films  

SciTech Connect (OSTI)

We tested oxidized titanium layers as barriers for hybrid Josephson junctions with high I{sub c}R{sub n}-products and for the preparation of junctions for tunneling spectroscopy. For that we firstly prepared junctions with conventional superconductor electrodes, such as lead and niobium, respectively. By tuning the barrier thickness, we were able to change the junction's behavior from a Josephson junction to tunnel-like behavior applicable for quasi-particle spectroscopy. Subsequently, we transferred the technology to junctions using Co-doped BaFe{sub 2}As{sub 2} thin films prepared by pulsed laser deposition as base electrode and evaporated Pb as counter electrode. For barriers with a thickness of 1.5?nm, we observe clear Josephson effects with I{sub c}R{sub n}?90??V at 4.2?K. These junctions behave SNS'-like (SNS: superconductor-normal conductor-superconductor) and are dominated by Andreev reflection transport mechanism. For junctions with barrier thickness of 2.0?nm and higher, no Josephson but SIS'- (SIS: superconductor-insulator-superconductor) or SINS'-like (SINS: superconductor-normal conductor-insulator-superconductor) behavior with a tunnel-like conductance spectrum was observed.

Dring, S., E-mail: sebastian.doering.1@uni-jena.de; Monecke, M.; Schmidt, S.; Schmidl, F.; Tympel, V.; Seidel, P., E-mail: paul.seidel@uni-jena.de [Institute of Solid State Physics, Friedrich-Schiller-Universitt Jena, Helmholtzweg 5, 07743 Jena (Germany); Engelmann, J.; Kurth, F.; Iida, K.; Holzapfel, B. [Institute for Metallic Materials, IFW Dresden, Helmholtzstrasse 20, 01171 Dresden (Germany); Haindl, S. [Institute for Solid State Research, IFW Dresden, Helmholtzstrasse 20, 01171 Dresden (Germany); Mnch, I. [Institute for Integrative Nanosciences, IFW Dresden, Helmholtzstrasse 20, 01171 Dresden (Germany)

2014-02-28T23:59:59.000Z

463

Saturation of two-level systems and charge noise in Josephson junction qubits Magdalena Constantin,1,* Clare C. Yu,1 and John M. Martinis2  

E-Print Network [OSTI]

Saturation of two-level systems and charge noise in Josephson junction qubits Magdalena Constantin to using superconducting Josephson junction qubits to construct quantum computers. Recent experiments7.094520 PACS number s : 74.40. k, 03.67.Pp, 77.22.Gm, 85.25.Cp I. INTRODUCTION The superconducting Josephson

Martinis, John M.

464

Thin-film silicon triple-junction solar cell with 12.5% stable efficiency on innovative flat light-scattering substrate  

E-Print Network [OSTI]

Thin-film silicon triple-junction solar cell with 12.5% stable efficiency on innovative flat light://jap.aip.org/about/rights_and_permissions #12;Thin-film silicon triple-junction solar cell with 12.5% stable efficiency on innovative flat light require light-trapping schemes that are predominantly based on depositing the solar cells on rough

Psaltis, Demetri

465

JOURNAL DE PHYSIQUE Colloque C6, supplPment au no 8, Tome 39, aotit 1978,page C6-550 EFFECT OF ORDER PARAMETER RELAXATION ON JOSEPHSON JUNCTION TRANSIENTS  

E-Print Network [OSTI]

OF ORDER PARAMETER RELAXATION ON JOSEPHSON JUNCTION TRANSIENTS f f X H. suhlt, J. Hurell , A.H. Silver state seems to become possible. The behavior of circuits containing Josephson junctions is generally

Boyer, Edmond

466

Highly transparent low capacitance plasma enhanced atomic layer deposition Al{sub 2}O{sub 3}-HfO{sub 2} tunnel junction engineering  

SciTech Connect (OSTI)

The development of metallic single electron transistor (SET) depends on the downscaling and the electrical properties of its tunnel junctions. These tunnel junctions should insure high tunnel current levels, low thermionic current, and low capacitance. The authors use atomic layer deposition to fabricate Al{sub 2}O{sub 3} and HfO{sub 2} thin layers. Tunnel barrier engineering allows the achievement of low capacitance Al{sub 2}O{sub 3} and HfO{sub 2} tunnel junctions using optimized annealing and plasma exposure conditions. Different stacks were designed and fabricated to increase the transparency of the tunnel junction while minimizing thermionic current. This tunnel junction is meant to be integrated in SET to enhance its electrical properties (e.g., operating temperature, I{sub ON}/I{sub OFF} ratio)

El Hajjam, Khalil, E-mail: khalil.el-hajjam@insa-lyon.fr [INL, INSA, UMR CNRS 5270, 7 Avenue Jean Capelle, 69621 Villeurbanne Cedex, France and Institut Interdisciplinaire d'Innovation Technologique (3IT), Universit de Sherbrooke, 3000 Boulevard Universit, Sherbrooke, J1K OA5, Qubec (Canada); Baboux, Nicolas; Calmon, Francis [INL, INSA, UMR CNRS 5270, 7 Avenue Jean Capelle, 69621 Villeurbanne Cedex (France); Souifi, Abdelkader [Laboratoire Nanotechnologies Nanosystmes (LN2)-CNRS UMI-3463, Universit de Sherbrooke, 3000 Boulevard Universit, Sherbrooke, J1K OA5, Qubec (Canada); Poncelet, Olivier; Francis, Laurent A. [ICTEAM, ELEN, UCL, Place du Levant 3, 1348 Louvain-la-Neuve (Belgium); Ecoffey, Serge; Drouin, Dominique [Laboratoire Nanotechnologies Nanosystmes (LN2)-CNRS UMI-3463, Universit de Sherbrooke, 3000 Boulevard Universit, Sherbrooke, J1K OA5, Qubec, Canada and Institut Interdisciplinaire d'Innovation Technologique (3IT), Universit de Sherbrooke, 3000 Boulevard Universit, Sherbrooke, J1K OA5, Qubec (Canada)

2014-01-15T23:59:59.000Z

467

Quantum Phase Diffusion in a Small Underdamped Josephson Junction H. F. Yu, X. B. Zhu, Z. H. Peng, Ye Tian, D. J. Cui, G. H. Chen, D. N. Zheng, X. N. Jing, Li Lu, and S. P. Zhao  

E-Print Network [OSTI]

Quantum Phase Diffusion in a Small Underdamped Josephson Junction H. F. Yu, X. B. Zhu, Z. H. Peng current biased Josephson junctions [1­9], colloidal particles in arrays of laser traps [10,11], cold atoms. The dynamics of a current biased Josephson junction can be visualized as a fictitious phase particle of mass C

Wang, Wei Hua

468

VOLUME 77, NUMBER 20 P H Y S I C A L R E V I E W L E T T E R S 11 NOVEMBER 1996 One-Dimensional Localization of Quantum Vortices in Disordered Josephson Junction Arrays  

E-Print Network [OSTI]

-Dimensional Localization of Quantum Vortices in Disordered Josephson Junction Arrays Alexander van Oudenaarden, S. J. K-dimensional arrays of Josephson junctions was studied experimentally. The vortices localize in disordered arrays of Josephson junctions. The great advantage of these systems is that disorder can be introduced in a very

van Oudenaarden, Alexander

469

VOLUME 79, NUMBER 12 P H Y S I C A L R E V I E W L E T T E R S 22 SEPTEMBER 1997 Transition Temperature of Josephson Junction Arrays with Long-Range Interaction  

E-Print Network [OSTI]

Temperature of Josephson Junction Arrays with Long-Range Interaction H. R. Shea and M. Tinkham Department of the resistive transition of Josephson junction arrays with long-range interaction. Because every wire an experimental investigation of ordered Josephson junction arrays with long-range interaction (ALRI), of the sort

Dalang, Robert C.

470

VOLUME 81, NUMBER 19 P H Y S I C A L R E V I E W L E T T E R S 9 NOVEMBER 1998 Cotunneling Transport and Quantum Phase Transitions in Coupled Josephson-Junction Chains  

E-Print Network [OSTI]

Transport and Quantum Phase Transitions in Coupled Josephson-Junction Chains with Charge Frustration Mahn of ultrasmall Josephson junctions, where the particle-hole symmetry is broken by the gate voltage applied blockade. Especially, in Josephson-junction arrays, the charging energy in competition with the Josephson

Choi, Mahn-Soo

471

Topological order and magnetic flux fractionalization in Josephson junction ladders with Mobius boundary conditions: a twisted CFT description  

E-Print Network [OSTI]

We propose a CFT description for a closed one-dimensional fully frustrated ladder of quantum Josephson junctions with Mobius boundary conditions (see cond-mat/0503555; we show how such a system can develop topological order thanks to flux fractionalization. Such a property is crucial for its implementation as a "protected" solid state qubit.

Gerardo Cristofano; Vincenzo Marotta; Adele Naddeo; Giuliano Niccoli

2005-07-25T23:59:59.000Z

472

Cryogenic ion implantation near amorphization threshold dose for halo/extension junction improvement in sub-30 nm device technologies  

SciTech Connect (OSTI)

We report on junction advantages of cryogenic ion implantation with medium current implanters. We propose a methodical approach on maximizing cryogenic effects on junction characteristics near the amorphization threshold doses that are typically used for halo implants for sub-30 nm technologies. BF{sub 2}{sup +} implant at a dose of 8 Multiplication-Sign 10{sup 13}cm{sup -2} does not amorphize silicon at room temperature. When implanted at -100 Degree-Sign C, it forms a 30 - 35 nm thick amorphous layer. The cryogenic BF{sub 2}{sup +} implant significantly reduces the depth of the boron distribution, both as-implanted and after anneals, which improves short channel rolloff characteristics. It also creates a shallower n{sup +}-p junction by steepening profiles of arsenic that is subsequently implanted in the surface region. We demonstrate effects of implant sequences, germanium preamorphization, indium and carbon co-implants for extension/halo process integration. When applied to sequences such as Ge+As+C+In+BF{sub 2}{sup +}, the cryogenic implants at -100 Degree-Sign C enable removal of Ge preamorphization, and form more active n{sup +}-p junctions and steeper B and In halo profiles than sequences at room temperature.

Park, Hugh; Todorov, Stan; Colombeau, Benjamin; Rodier, Dennis; Kouzminov, Dimitry; Zou Wei; Guo Baonian; Khasgiwale, Niranjan; Decker-Lucke, Kurt [Applied Materials, Varian Semiconductor Equipment, 35 Dory Road, Gloucester, Massachusetts 01930 (United States)

2012-11-06T23:59:59.000Z

473

PHYSICAL REVIEW B 85, 024521 (2012) Evidence for coherent quantum phase slips across a Josephson junction array  

E-Print Network [OSTI]

PHYSICAL REVIEW B 85, 024521 (2012) Evidence for coherent quantum phase slips across a Josephson of the order parameter. However, in a finite-length wire, coherent quantum phase slips would manifest on a long Josephson junction array acting as a "slippery" wire. The slip-induced linewidths, despite being

Devoret, Michel H.

474

Efficiency Enhancement of PEDOT:PSS/Si Hybrid Solar Cells by Using Nanostructured Radial Junction and Antireflective Surface  

Science Journals Connector (OSTI)

Efficiency Enhancement of PEDOT:PSS/Si Hybrid Solar Cells by Using Nanostructured Radial Junction and Antireflective Surface ... Department of Electrical and Computer Engineering and Waterloo Institute for Nanotechnology (WIN), University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada ...

Jheng-Yuan Chen; Celal Con; Ming-Hung Yu; Bo Cui; Kien Wen Sun

2013-07-11T23:59:59.000Z

475

Florence & Oracle Junction, Pinal County, AZ, RECORD OF CATEGORICAL EXCLUSION DETERMINATION  

Broader source: Energy.gov (indexed) [DOE]

emergency wood pole emergency wood pole replacement at 59 structures located along the Coolidge-Oracle 115-kV T.L. , near Cooiidge, Florence & Oracle Junction, Pinal County, AZ, RECORD OF CATEGORICAL EXCLUSION DETERMINATION A. Proposed Action: Western plans to replace deteriorated wood poles, cross arms and X-braces at 59 existing H-frame or 3-pole-turning structures (Table 1) located along the Coolidge-Oracle 115-kV Transmission Line in Pinal County, Arizona (Figure 1), Built in 1943, its aging components are beyond repair and require replacement. These poles performed poorly during structural tests, and we consider them unstable, This project ensures the safety of Western's workers and the public as well as reliability of the bulk electric system, Western will accomplish the work by clearing vegetation and blading a level pad at

476

Charge solitons and their dynamical mass in one-dimensional arrays of Josephson junctions  

SciTech Connect (OSTI)

We investigate charge transport in one-dimensional arrays of Josephson junctions. In the interesting regime of ''small charge solitons'' (polarons), {Lambda}E{sub J}>E{sub C}>E{sub J}, where {Lambda} is the (electrostatic) screening length, the charge dynamics are strongly influenced by the polaronic effects (i.e., by dressing of a Cooper pair by charge dipoles). In particular, the soliton's mass in this regime scales approximately as E{sub J}{sup -2}. We employ two theoretical techniques: the many-body tight-binding approach and the mean-field approach, and the results of the two approaches agree in the regime of ''small charge solitons.'' Renormalization of the soliton's mass could be observed; for example, as enhancement of the persistent current in a ring-shaped array.

Homfeld, Jens [Institut fuer Theorie der Kondensierten Materie, Karlsruhe Institute of Technology, D-76128 Karlsruhe (Germany); Protopopov, Ivan [Institut fuer Nanotechnologie, Karlsruhe Institute of Technology, D-76021 Karlsruhe (Germany); Landau Institute for Theoretical Physics, RU-119334 Moscow (Russian Federation); Rachel, Stephan [Department of Physics, Yale University, New Haven, Connecticut 06520 (United States); Shnirman, Alexander [Institut fuer Theorie der Kondensierten Materie, Karlsruhe Institute of Technology, D-76128 Karlsruhe (Germany); DFG Center for Functional Nanostructures (CFN), Karlsruhe Institute of Technology, D-76128 Karlsruhe (Germany)

2011-02-01T23:59:59.000Z

477

Controllable 0 ? ? transition in iron pnictide superconductor junctions with a spacer of strong ferromagnet  

SciTech Connect (OSTI)

We investigate the control of 0?? transition in Josephson junctions consisting of a highly spin-polarized ferromagnet coupled to two iron pnictide superconductors (SCs). It is shown that, a 0?? transition as a function of interband coupling strength is always exhibited, which can be experimentally used to discriminate the s{sub }-wave pairing symmetry in the iron pnictide SCs from the s{sub ++}-wave one in MgB{sub 2}. By tuning the doping level in the s{sub }-wave SCs, one can vary the interband coupling strength so as to obtain the controllable 0?? transition. This device may be realized with current technologies and has practical use in Cooper pair spintronics and quantum information.

Liu, S. Y.; Tao, Y. C., E-mail: yctao88@163.com; Ji, T. T.; Di, Y. S. [Department of Physics and Institute of Theoretical Physics, Nanjing Normal University, Nanjing 210023 (China); Hu, J. G. [Department of Physics, Yangzhou University, Yangzhou 225002 (China)

2014-03-17T23:59:59.000Z

478

Effect of magnetic field on quasiparticle branches of intrinsic Josephson junctions with ferromagnetic layer.  

SciTech Connect (OSTI)

The interlayer tunneling spectroscopy has been performed on micron-sized mesa arrays of HgBr{sub 2} intercalated superconducting Bi2212 single crystals. A ferromagnetic multilayer (Au/Co/Au) is deposited on top of the mesas. The spin-polarized current is driven along the c-axis of the mesas through a ferromagnetic Co layer and the hysteretic quasiparticle branches are observed at 4.2 K. Magnetic field evolution of hysteretic quasiparticle branches is obtained to examine the effect of injected spin-polarized current on intrinsic Josephson junction characteristics. It is observed that there is a gradual distribution in quasiparticle branches with the application of magnetic field and increasing field reduces the switching current progressively.

Ozyuzer, L.; Ozdemir, M.; Kurter, C.; Hinks, D. G.; Gray, K. E. (Materials Science Division); (Izmir Inst. of Tech.)

2007-01-01T23:59:59.000Z

479

Tunneling dynamics of bosonic Josephson junctions assisted by a cavity field  

E-Print Network [OSTI]

We study the interplay between the dynamics of a Bose-Einstein condensate in a double-well potential and that of an optical cavity mode. The cavity field is superimposed to the double-well potential and affects the atomic tunneling processes. The cavity field is driven by a laser red detuned from the bare cavity resonance; the dynamically changing spatial distribution of the atoms can shift the cavity in and out of resonance. At resonance the photon number is hugely enhanced and the atomic tunneling becomes amplified. The Josephson junction equations are revisited and the phase diagram is calculated. We find new solutions with finite imbalance and at the same time a lack of self-trapping solutions due to the emergence of a new separatrix resulting from enhanced tunneling.

G. Szirmai; G. Mazzarella; L. Salasnich

2015-01-13T23:59:59.000Z

480

Interplay between coherence and entanglement in macroscopic cat states of a bosonic Josephson junction  

E-Print Network [OSTI]

We study the interplay between coherence and entanglement in macroscopic Schr\\"odinger-cat states of a bosonic Josephson junction made of $N$ ultracold and dilute atoms confined in a quasi-one-dimensional double-well optical trap. We characterize the presence of macroscopic Schr\\"odinger-cat states by using the Fisher information $F$, the coherence by using the visibility $\\alpha$ of the interference fringes in the momentum distribution, and the entanglement of the ground-state by using the entanglement entropy $S$. Within the two-site Bose-Hubbard model framework these quantities are calculated by changing the inter-atomic interaction strength from the strongly attractive regime to the strongly repulsive one. In this way we investigate the crossover from a macroscopic Schr\\"odinger-cat state across an atomic coherent state to a pure Fock state.

Mazzarella, Giovanni; Parola, Alberto; Toigo, Flavio

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "junction greenfield grundy" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


481

Pinned fluxons in a Josephson junction with a finite-length inhomogeneity  

E-Print Network [OSTI]

We consider a Josephson junction system installed with a finite length inhomogeneity, either of microresistor or of microresonator type. The system can be modelled by a sine-Gordon equation with a piecewise-constant function to represent the varying Josephson tunneling critical current. The existence of pinned fluxons depends on the length of the inhomogeneity, the variation in the Josephson tunneling critical current and the applied bias current. We establish that a system may either not be able to sustain a pinned fluxon, or - for instance by varying the length of the inhomogeneity - may exhibit various different types of pinned fluxons. Our stability analysis shows that changes of stability can only occur at critical points of the length of the inhomogeneity as a function of the (Hamiltonian) energy density inside the inhomogeneity - a relation we determine explicitly. In combination with continuation arguments and Sturm-Liouville theory, we determine the stability of all constructed pinned fluxons. It fol...

Derks, Gianne; Knight, Christopher J K; Susanto, Hadi

2011-01-01T23:59:59.000Z

482

Collective Cooper-pair transport in the insulating state of Josephson-junction arrays.  

SciTech Connect (OSTI)

We investigate collective Cooper-pair transport of one- and two-dimensional Josephson-junction arrays. We derive an analytical expression for the current-voltage characteristic revealing thermally activated conductivity at small voltages and threshold voltage depinning. The activation energy and the related depinning voltage represent a dynamic Coulomb barrier for collective charge transfer over the whole system and scale with the system size. We show that both quantities are nonmonotonic functions of the magnetic field. We propose that formation of the dynamic Coulomb barrier and its size scaling are consequences of the mutual Josephson phase synchronization across the system. We apply the results for interpretation of experimental data in disordered films near the superconductor-insulator transition.

Fistul, M. V.; Vinokur, V. M.; Baturina, T. I.; Materials Science Division; Ruhr-Univ. Bochum; Inst. Semiconductor Physics

2008-02-01T23:59:59.000Z

483

Noise and microresonance of critical current in Josephson junction induced by Kondo trap states  

E-Print Network [OSTI]

We analyze the impact of trap states in the oxide layer of a superconducting tunnel junctions, on the fluctuation of the Josephson critical current, thus on coherence in superconducting qubits. Two mechanisms are usually considered: the current blockage due to repulsion at the occupied trap states, and the noise from electrons hopping across a trap. We extend previous studies of noninteracting traps to the case where the traps have on-site electron repulsion inside one ballistic channel. The repulsion not only allows the appropriate temperature dependence of 1/f noise, but also is a control to the coupling between the computational qubit and the spurious two-level systems inside the oxide dielectric. We use second order perturbation theory which allows to obtain analytical formulae for the interacting bound states and spectral weights, limited to small and intermediate repulsions. Remarkably, it still reproduces the main features of the model as identified from the Numerical Renormalization Group. We present ...

Ansari, Mohammad H

2011-01-01T23:59:59.000Z

484

Dynamical mass of a quantum vortex in a Josephson junction array  

SciTech Connect (OSTI)

The real-time response to a small external perturbation of a vortex in a quantum Josephson junction array, with long-range Coulomb interaction between Cooper pairs, is analyzed. While the static damping is zero for vortex velocities below some threshold value v{sub th} (which implies the possibility of ballistic motion), a dynamical friction due to the coupling to the plasma oscillations is always present for frequencies higher than a given threshold {omega}{sub th}. The latter approaches zero when the velocity increases to v{sub th}. However, radiative dissipation of the vortex affects the threshold for ballistic motion. We discuss the conditions under which a mass can be defined for the vortex as a quantum particle. {copyright} {ital 1997} {ital The American Physical Society}

Eckern, U. [Institut fuer Physik, Universitaet Augsburg, D-86135 Augsburg (Germany)] [Institut fuer Physik, Universitaet Augsburg, D-86135 Augsburg (Germany); Luciano, G.; Tagliacozzo, A. [Dipartimento di Scienze Fisiche, Universita di Napoli, Mostra dOltremare Pad. 19, I-80125 Napoli (Italy)] [Dipartimento di Scienze Fisiche, Universita di Napoli, Mostra dOltremare Pad. 19, I-80125 Napoli (Italy); [Istituto Nazionale di Fisica della Materia (INFM), I-16152 Genova (Italy)

1997-12-01T23:59:59.000Z

485

Fully frustrated Josephson junction ladders with Mobius boundary conditions as topologically protected qubits  

E-Print Network [OSTI]

We show how to realize a ``protected'' qubit by using a fully frustrated Josephson Junction ladder (JJL) with Mobius boundary conditions. Such a system has been recently studied within a twisted conformal field theory (CFT) approach (Mod. Phys. Lett. A 15 (2000) 1679; Nucl. Phys. B 641 (2002) 547) and shown to develop the phenomenon of flux fractionalization (Eur. Phys. J. B 49 (2006) 83). The relevance of a ``closed'' geometry has been fully exploited in relating the topological properties of the ground state of the system to the presence of half flux quanta and the emergence of a topological order has been predicted (JSTAT (2005) P03006). In this letter the stability and transformation properties of the ground states under adiabatic magnetic flux change are analyzed and the deep consequences on the realization of a solid state qubit, protected from decoherence, are presented.

Gerardo Cristofano; Vincenzo Marotta; Adele Naddeo; Giuliano Niccoli

2007-11-27T23:59:59.000Z

486

Epitaxial-Graphene/Graphene-Oxide Junction: An Essential Step towards Epitaxial Graphene Electronics  

Science Journals Connector (OSTI)

Graphene-oxide (GO) flakes have been deposited to bridge the gap between two epitaxial-graphene electrodes to produce all-graphene devices. Electrical measurements indicate the presence of Schottky barriers at the graphene/graphene-oxide junctions, as a consequence of the band gap in GO. The barrier height is found to be about 0.7eV, and is reduced after annealing at 180?C, implying that the gap can be tuned by changing the degree of oxidation. A lower limit of the GO mobility was found to be 850??cm2/V?s, rivaling silicon. Insitu local oxidation of patterned epitaxial graphene has been achieved.

Xiaosong Wu; Mike Sprinkle; Xuebin Li; Fan Ming; Claire Berger; Walt A. de Heer

2008-07-07T23:59:59.000Z

487

Giant electrocaloric effect in asymmetric ferroelectric tunnel junctions at room temperature  

SciTech Connect (OSTI)

Room-temperature electrocaloric properties of Pt/BaTiO{sub 3}/SrRuO{sub 3} ferroelectric tunnel junctions (FTJs) are studied by using a multiscale thermodynamic model. It is found that there is a divergence in the adiabatic temperature change ?T for the two opposite polarization orientations. This difference under a typical writing voltage of 3?V can reach over 1?K as the barrier thickness decreases. Thanks to the ultrahigh external stimulus, a giant electrocaloric effect (1.53?K/V) with ?T being over 4.5?K can be achieved at room temperature, which demonstrates the perspective of FTJs as a promising solid-state refrigeration.

Liu, Yang, E-mail: liuyangphy52@gmail.com; Infante, Ingrid C.; Dkhil, Brahim, E-mail: brahim.dkhil@ecp.fr [Laboratoire Structures, Proprits et Modlisation des Solides, UMR 8580 CNRS-Ecole Centrale Paris, Grande Voie des Vignes, Chtenay-Malabry Cedex 92295 (France); Lou, Xiaojie [Multi-disciplinary Materials Research Center, Frontier Institute of Science and Technology, and State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049 (China)

2014-02-24T23:59:59.000Z

488

Josephson junction at the onset of chaos: A complete devil's staircase  

SciTech Connect (OSTI)

By analog computer calculations of the resistively and capacitively shunted Josephson junction model, I-V characteristics are measured for several choices of the parameters in the Josephson equation. The points, where hysteresis sets in, are related to cubic inflection points in the return map. For different values of the amplitude and the frequency of the imposed ac field the critical line is determined in the (I,G) space, where I is the dc current and G is the damping factor. Furthermore, the subharmonic steps along the critical line form a complete devil's staircase with a fractal dimension Dapprox.0.87 and a decay exponent for the (1/Q)-steps deltaapprox.3. Besides the hysteresis which gives occasion for a chaotic behavior everywhere below a certain critical voltage, hysteresis also turns up locally. It is suggested that the critical points where local hysteresis occurs can be found by use of a local approximation.

Alstrom, P.; Levinsen, M.T.

1985-03-01T23:59:59.000Z

489

Analog simulations of josephson junction in a microwave field. Devil's staircase, fractal dimension, and decay constants  

SciTech Connect (OSTI)

The RSJ model of the Josephson junction in the presence of a microwave field is studied using an analog computer, with special attention to the behavior of this system near or at the critical line, where the set of substeps forms a complete devil's staircase on the I-V characteristic. A value of fractal dimension D = 0.868 +/- 0.002 is determined from 240 substeps between the winding numbers W = 0 and W = 1. Four values of decay constants are determined. The results agree very well with the prediction obtained from the one-dimensional circle map. A self-similarity graph is shown confirming that the staircase is very near the critical line. Results confirm the universal and global character of D and decay constants on the critical line, as was suggested by Jensen et al.

Kuznik, V.; Odehnal, M.

1986-12-01T23:59:59.000Z

490

Synchronization of coupled single-electron circuits based on nanoparticles and tunneling junctions  

Science Journals Connector (OSTI)

We explore theoretically the synchronization properties of a device composed of coupled single-electron circuits whose building blocks are nanoparticles interconnected with tunneling junctions. Elementary nanoscillators can be achieved by a single-electron tunneling cell where the relaxation oscillation is induced by the tunneling. We develop a model to describe the synchronization of the nanoscillators and present sample calculations to demonstrate that the idea is feasible and could readily find applications. Instead of considering a particular system we analyze the general properties of the device making use of an ideal model that emphasizes the essential characteristics of the concept. We define an order parameter for the system as a whole and demonstrate phase synchronization for sufficiently high values of the coupling resistance.

Javier Cervera; Jos A. Manzanares; Salvador Maf

2009-01-01T23:59:59.000Z

491

Fabrication of atomic-scale gold junctions by electrochemical plating using a common medical liquid  

Science Journals Connector (OSTI)

Fabrication of nanometer-separated gold junctions has been performed using iodine tincture a medical liquid known as a disinfectant as an etching/deposition electrolyte. In the gold-dissolved iodine tincture goldelectrodes were grown or eroded slowly enough to form quantum point contacts in an atomic scale. The resistance evolution during the electrochemicaldeposition showed plateaus at integer multiples of the resistance quantum ( 2 e 2 ? h ) ? 1 at room temperature ( e : the elementary charge h : the Planck constant). Iodine tincture is a commercially available common material which makes the fabrication process to be simple and cost effective. Moreover in contrast to the conventional electrochemical approaches this method is free from highly toxic cyanide compounds or extraordinarily strong acids.

A. Umeno; K. Hirakawa

2005-01-01T23:59:59.000Z

492

Low-frequency magnetic and resistance noise in magnetic tunnel junctions  

Science Journals Connector (OSTI)

We have studied the voltage fluctuations of current-biased, micron-scale magnetic tunnel junctions. We find that the spectral power density is 1/f-like at low frequencies and becomes frequency independent at high frequencies. The frequency-independent background noise is due to Johnson-Nyquist noise and shot noise mechanisms. The nature of the 1/f noise has its origin in two different mechanisms. In the magnetic hysteresis loops this noise power is strongly field-dependent and is due to thermal magnetization fluctuations in both the free and fixed magnetic layers. We attribute these magnetic fluctuations to thermally excited hopping of magnetic domain walls between pinning sites. At high temperatures, this magnetic noise is found to track the dc resistance susceptibility but it is not in quantitative agreement with the fluctuation dissipation relation, indicating that the magnetic structure is not in equilibrium. A second mechanism for the 1/f noise, connected with defects in the tunnel barrier but not related to the overall magnetization fluctuations, was found at fields for which the magnetic structure in the free and fixed layers is well aligned. We attribute this noise to electron trapping processes having thermally activated kinetics and a broad distribution of activation energies. Below ?25 K the noise power is temperature independent suggesting that the kinetics are dominated by tunneling. Our results show that the thermal stability of both the magnetic layers and the quality of the tunnel barrier are important factors in reducing the low-frequency noise in magnetic tunnel junctions.

L. Jiang; E. R. Nowak; P. E. Scott; J. Johnson; J. M. Slaughter; J. J. Sun; R. W. Dave

2004-02-13T23:59:59.000Z

493

Surface tension of multi-phase flow with multiple junctions governed by the variational principle  

E-Print Network [OSTI]

We explore a computational model of an incompressible fluid with a multi-phase field in three-dimensional Euclidean space. By investigating an incompressible fluid with a two-phase field geometrically, we reformulate the expression of the surface tension for the two-phase field found by Lafaurie, Nardone, Scardovelli, Zaleski and Zanetti (J. Comp. Phys. \\vol{113} \\yr{1994} \\pages{134-147}) as a variational problem related to an infinite dimensional Lie group, the volume-preserving diffeomorphism. The variational principle to the action integral with the surface energy reproduces their Euler equation of the two-phase field with the surface tension. Since the surface energy of multiple interfaces even with singularities is not difficult to be evaluated in general and the variational formulation works for every action integral, the new formulation enables us to extend their expression to that of a multi-phase ($N$-phase, $N\\ge2$) flow and to obtain a novel Euler equation with the surface tension of the multi-phase field. The obtained Euler equation governs the equation of motion of the multi-phase field with different surface tension coefficients without any difficulties for the singularities at multiple junctions. In other words, we unify the theory of multi-phase fields which express low dimensional interface geometry and the theory of the incompressible fluid dynamics on the infinite dimensional geometry as a variational problem. We apply the equation to the contact angle problems at triple junctions. We computed the fluid dynamics for a two-phase field with a wall numerically and show the numerical computational results that for given surface tension coefficients, the contact angles are generated by the surface tension as results of balances of the kinematic energy and the surface energy.

Shigeki Matsutani; Kota Nakano; Katsuhiko Shinjo

2011-08-02T23:59:59.000Z

494

Study of junction flows in louvered fin round tube heat exchangers using the dye injection technique  

SciTech Connect (OSTI)

Detailed studies of junction flows in heat exchangers with an interrupted fin design are rare. However, understanding these flow structures is important for design and optimization purposes, because the thermal hydraulic performance of heat exchangers is strongly related to the flow behaviour. In this study flow visualization experiments were performed in six scaled-up models of a louvered fin round tube heat exchanger. The models have three tube rows in a staggered layout and differ only in their fin spacing and louver angle. A water tunnel was designed and built and the flow visualizations were carried out using dye injection. At low Reynolds numbers the streakline follows the tube contours, while at higher Reynolds numbers a horseshoe vortex is developed ahead of the tubes. The two resulting streamwise vortex legs are destroyed by the downstream louvers (i.e. downstream the turnaround louver), especially at higher Reynolds numbers, smaller fin pitches and larger louver angles. Increasing the fin spacing results in a larger and stronger horseshoe vortex. This illustrates that a reduction of the fin spacing results in a dissipation of vortical motion by mechanical blockage and skin friction. Furthermore it was observed that the vortex strength and number of vortices in the second tube row is larger than in the first tube row. This is due to the thicker boundary layer in the second tube row, and the flow deflection, which is typical for louvered fin heat exchangers. Visualizations at the tube-louver junction showed that in the transition part between the angled louver and the flat landing a vortex is present underneath the louver surface which propagates towards the angled louver. (author)

Huisseune, H.; Willockx, A.; De Paepe, M. [Department of Flow, Heat and Combustion Mechanics, Ghent University, Sint-Pietersnieuwstraat 41, 9000 Gent (Belgium); T'Joen, C. [Department of Flow, Heat and Combustion Mechanics, Ghent University, Sint-Pietersnieuwstraat 41, 9000 Gent (Belgium); Department Radiation, Radionuclides and Reactors, Delft University of Technology, Mekelweg 15, 2629 JB Delft (Netherlands); De Jaeger, P. [Department of Flow, Heat and Combustion Mechanics, Ghent University, Sint-Pietersnieuwstraat 41, 9000 Gent (Belgium); NV Bekaert SA, Bekaertstraat 2, 8550 Zwevegem (Belgium)

2010-11-15T23:59:59.000Z

495

The effect of CdS QDs structure on the InGaP/GaAs/Ge triple junction solar cell efficiency  

Science Journals Connector (OSTI)

This work describes optical and electrical characteristics of InGaP/GaAs/Ge triple-junction (T-J) solar cells with CdS quantum dots (QDs) ... quantum dot effectively enhance the overall power conversion efficiency

Chen-Chen Chung; Binh Tinh Tran; Hau-Vei Han; Yen-Teng Ho

2014-03-01T23:59:59.000Z

496

Comparative Studies on Temperature Dependent I-V Characteristics of Al/(p)CdTe and Ni/(n)CdS Schottky Junctions and Their PV Effect  

SciTech Connect (OSTI)

Temperature dependent I-V characteristics of vacuum evaporated Al/(p)CdTe and Ni/(n)CdS Schottky junctions and their photovoltaic effects have been studied and compared. Different junction parameters such as ideality factors, barrier heights, Richardson's constant, short-circuit current density, fill factor, PV efficiency etc. were determined from their I-V characteristics. These parameters were found to change significantly on variation of temperature. The structures showed the change of PV effect. Efficiency found were 2.84% for Al/(p)CdTe and 4.44% for Ni hydro/(n)CdS. Polycrystalline nature, and continuous and ordered structure with bigger grain sizes of the CdS film shows more PV conversion efficiency in making Ni/(n)CdS junction as compare to Al/(p)CdTe junction. However these values were found to vary with doping concentration, and in hydrogen treated samples in both cases.

Wary, G. [Department of Physics, Cotton College, Guwahati-781001 (India); Kachari, T.; Rahman, A. [Department of Physics, Gauhati University, Guwahati-781014 (India)

2010-06-29T23:59:59.000Z

497

Edge photoluminescence of single-crystal silicon with a p-n junction: Structures produced by high-efficiency solar cell technology  

Science Journals Connector (OSTI)

The systematic features and kinetics of edge photoluminescence of silicon structures produced by the high-efficiency solar cell technology is studied at different voltages applied to...p-n junction. It is shown t...

A. M. Emelyanov

2011-06-01T23:59:59.000Z

498

Building America Technology Solutions for New and Existing Homes: New Insights for Improving the Designs of Flexible Duct Junction Boxes (Fact Sheet)  

Broader source: Energy.gov [DOE]

IBACOS explored the relationships between pressure and physical configurations of flexible duct junction boxes by using computational fluid dynamics simulations to predict individual box parameters and total system pressure, thereby ensuring improved HVAC performance.

499

Dynamical analysis of a weakly coupled nonlinear dielectric waveguide: Surface-plasmon model as another type of Josephson junction  

SciTech Connect (OSTI)

We propose that a weakly coupled nonlinear dielectric waveguide surface-plasmon system can be formulated as another type of Josephson junction. Such a system can be realized along a metal-dielectric interface where the dielectric medium hosts a nonlinear waveguide (e.g., fiber) for soliton propagation. We demonstrate that the system is in close analogy to the bosonic Josephson junction of atomic condensates at very low temperatures, yet exhibits different dynamical features. In particular, the inherently dynamic coupling parameter between soliton and surface plasmon generates self-trapped oscillatory states at nonzero fractional populations with zero and {pi} time-averaged phase difference. The salient features of the dynamics are presented in the phase space.

Eksioglu, Yasa; Muestecaplioglu, Oezguer E.; Gueven, Kaan [Department of Physics, Koc University, Istanbul (Turkey)

2011-09-15T23:59:59.000Z

500

Dynamical analysis of a weakly coupled nonlinear dielectric waveguide -- surface-plasmon model as a new type of Josephson Junction  

E-Print Network [OSTI]

We propose that a weakly-coupled nonlinear dielectric waveguide -- surface-plasmon system can be formulated as a new type of Josephson junction. Such a system can be realized along a metal - dielectric interface where the dielectric medium hosts a nonlinear waveguide (e.g. fiber) for soliton propagation. We demonstrate that the system is in close analogy to the bosonic Josephson-Junction (BJJ) of atomic condensates at very low temperatures, yet exhibits different dynamical features. In particular, the inherently dynamic coupling parameter between soliton and surface-plasmon generates self-trapped oscillatory states at nonzero fractional populations with zero and $\\pi$ time averaged phase difference. The salient features of the dynamics are presented in the phase space.

Ek?io?lu, Yasa; Gven, Kaan

2011-01-01T23:59:59.000Z