Powered by Deep Web Technologies
Note: This page contains sample records for the topic "quantum hall effect" 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

Fractional Quantum Hall Effect and Nonabelian Statistics  

Science Journals Connector (OSTI)

......Articles Fractional Quantum Hall Effect and Nonabelian Statistics N...rc=1/8-1/8=0; this effect would be due to the Pfaffian...Sloan Foundation Fellow- ship and by NSF PYI DMR-9157484...ed.), The Quantum Hall Effect, 2nd edition (Springer, New......

N. Read; G. Moore

1992-01-01T23:59:59.000Z

2

Dynamical competition between quantum Hall and quantum spin Hall effects  

Science Journals Connector (OSTI)

In this paper, we investigate the occurrence of quantum phase transitions in topological systems out of equilibrium. More specifically, we consider graphene with a sizable spin-orbit coupling, irradiated by circularly polarized light. In the absence of light, the spin-orbit coupling drives a quantum spin Hall phase where edge currents with opposite spins counterpropagate. On the other hand, the light generates a time-dependent vector potential, which leads to a hopping parameter with staggered time-dependent phases around the benzene ring. The model is a dynamical version of the Haldane model, which considers a static staggered flux with zero total flux through each plaquette. Since the light breaks time-reversal symmetry, a quantum Hall (QH) phase protected by an integer topological invariant arises. An important difference with the static QH phase is the existence of counterpropagating edge states at different momenta, which are made possible by zero- and two-photon resonances. By numerically solving the complete problem, with spin-orbit coupling and light, and investigating different values of the driving frequency ?, we show that the spectrum exhibits nontrivial gaps not only at zero energy but also at ?/2. This additional gap is created by photon resonances between the valence and conduction band of graphene, and the symmetry of the spectrum forces it to lie at ?/2. By increasing the intensity of the irradiation, the topological state in the zero energy gap undergoes a dynamical phase transition from a quantum spin Hall to a quantum Hall phase, whereas the gap around ?/2 remains in the quantum Hall regime.

A. Quelle and C. Morais Smith

2014-11-19T23:59:59.000Z

3

Unconventional Integer Quantum Hall effect in graphene  

E-Print Network (OSTI)

Monolayer graphite films, or graphene, have quasiparticle excitations that can be described by 2+1 dimensional Dirac theory. We demonstrate that this produces an unconventional form of the quantized Hall conductivity $\\sigma_{xy} = - (2 e^2/h)(2n+1)$ with $n=0,1,...$, that notably distinguishes graphene from other materials where the integer quantum Hall effect was observed. This unconventional quantization is caused by the quantum anomaly of the $n=0$ Landau level and was discovered in recent experiments on ultrathin graphite films.

V. P. Gusynin; S. G. Sharapov

2005-06-22T23:59:59.000Z

4

The Quantum Hall Effect in Graphene  

E-Print Network (OSTI)

We investigate the quantum Hall effect in graphene. We argue that in graphene in presence of an external magnetic field there is dynamical generation of mass by a rearrangement of the Dirac sea. We show that the mechanism breaks the lattice valley degeneracy only for the $n=0$ Landau levels and leads to the new observed $\

Paolo Cea

2011-01-29T23:59:59.000Z

5

Topological insulators in silicene: Quantum hall, quantum spin hall and quantum anomalous hall effects  

SciTech Connect

Silicene is a monolayer of silicon atoms forming a two-dimensional honeycomb lattice, which shares almost every remarkable property with graphene. The low energy dynamics is described by Dirac electrons, but they are massive due to relatively large spin-orbit interactions. I will explain the following properties of silicene: 1) The band structure is controllable by applying an electric field. 2) Silicene undergoes a phase transition from a topological insulator to a band insulator by applying external electric field. 3) The topological phase transition can be detected experimentally by way of diamagnetism. 4) There is a novel valley-spin selection rules revealed by way of photon absorption. 5) Silicene yields a remarkably many phases such as quantum anomalous Hall phase and valley polarized metal when the exchange field is additionally introduced. 6) A silicon nanotubes can be used to convey spin currents under an electric field.

Ezawa, Motohiko [Department of Applied Physics, University of Tokyo, Hongo 7-3-1, Tokyo 113-8656 (Japan)

2013-12-04T23:59:59.000Z

6

Planck's quantum-driven integer quantum Hall effect in chaos  

E-Print Network (OSTI)

The integer quantum Hall effect (IQHE) and chaos are commonly conceived as being unrelated. Contrary to common wisdoms, we find in a canonical chaotic system, the kicked spin-$1/2$ rotor, a Planck's quantum($h_e$)-driven phenomenon bearing a firm analogy to IQHE but of chaos origin. Specifically, the rotor's energy growth is unbounded ('metallic' phase) for a discrete set of critical $h_e$-values, but otherwise bounded ('insulating' phase). The latter phase is topological in nature and characterized by a quantum number ('quantized Hall conductance'). The number jumps by unity whenever $h_e$ decreases passing through each critical value. Our findings, within the reach of cold-atom experiments, indicate that rich topological quantum phenomena may emerge from chaos.

Yu Chen; Chushun Tian

2014-09-18T23:59:59.000Z

7

Robert B. Laughlin and the Fractional Quantum Hall Effect  

NLE Websites -- All DOE Office Websites (Extended Search)

Robert B. Laughlin and the Fractional Quantum Hall Effect Robert B. Laughlin and the Fractional Quantum Hall Effect Resources with Additional Information Robert B. Laughlin Photo Courtesy of LLNL Robert B. Laughlin shared the 1998 Nobel Prize in Physics with Horst L. Störmer and Daniel C. Tsui for 'their discovery of a new form of quantum fluid with fractionally charged excitations'. ' ... [I]n 1982 ... Störmer and Tsui discovered the effect. In 1983, Laughlin, then at the Lawrence Livermore National Laboratory, provided the theoretical explanation of the effect in terms of fractionally charged particles. It was a "confluence of things from engineering that prepared me for understanding the fractional quantum Hall effect and coming up with an explanation," Laughlin said during a television interview at Stanford. ...

8

Quantum Hall effect in graphene decorated with disordered multilayer patches  

SciTech Connect

Quantum Hall effect (QHE) is observed in graphene grown by chemical vapour deposition using platinum catalyst. The QHE is even seen in samples which are irregularly decorated with disordered multilayer graphene patches and have very low mobility (<500 cm{sup 2}V{sup ?1}s{sup ?1}). The effect does not seem to depend on electronic mobility and uniformity of the resulting material, which indicates the robustness of QHE in graphene.

Nam, Youngwoo, E-mail: youngwoo.nam@chalmers.se [Department of Physics and Astronomy, Seoul National University, Seoul 151-747 (Korea, Republic of) [Department of Physics and Astronomy, Seoul National University, Seoul 151-747 (Korea, Republic of); Department of Microtechnology and Nanoscience, Chalmers University of Technology, SE-412 96 Gothenburg (Sweden); Sun, Jie, E-mail: jie.sun@chalmers.se; Lindvall, Niclas; Kireev, Dmitry; Yurgens, August [Department of Microtechnology and Nanoscience, Chalmers University of Technology, SE-412 96 Gothenburg (Sweden)] [Department of Microtechnology and Nanoscience, Chalmers University of Technology, SE-412 96 Gothenburg (Sweden); Jae Yang, Seung; Rae Park, Chong [Department of Materials Science and Engineering, Seoul National University, Seoul 151-747 (Korea, Republic of)] [Department of Materials Science and Engineering, Seoul National University, Seoul 151-747 (Korea, Republic of); Woo Park, Yung [Department of Physics and Astronomy, Seoul National University, Seoul 151-747 (Korea, Republic of)] [Department of Physics and Astronomy, Seoul National University, Seoul 151-747 (Korea, Republic of)

2013-12-02T23:59:59.000Z

9

A programmable quantum current standard from the Josephson and the quantum Hall effects  

SciTech Connect

We propose a way to realize a programmable quantum current standard (PQCS) from the Josephson voltage standard and the quantum Hall resistance standard (QHR) exploiting the multiple connection technique provided by the quantum Hall effect (QHE) and the exactness of the cryogenic current comparator. The PQCS could lead to breakthroughs in electrical metrology like the realization of a programmable quantum current source, a quantum ampere-meter, and a simplified closure of the quantum metrological triangle. Moreover, very accurate universality tests of the QHE could be performed by comparing PQCS based on different QHRs.

Poirier, W., E-mail: wilfrid.poirier@lne.fr; Lafont, F.; Djordjevic, S.; Schopfer, F.; Devoille, L. [Quantum metrology group, Laboratoire National de mtrologie et d'Essais, 29 avenue Roger Hennequin, 78197 Trappes (France)

2014-01-28T23:59:59.000Z

10

Missing integral quantum Hall effect in a wide single quantum well  

Science Journals Connector (OSTI)

We report magnetotransport measurements in a weakly coupled double-layer electron system realized in a wide quantum well. This system has the unique property that the distance and the coupling between the layers can be changed continuously by varying the electron density in the well. We observe the absence of quantum Hall states at odd filling factors. Our results complement earlier experimental work and are consistent with a recent theoretical model proposed for the magnetic-field-driven destruction of the quantum Hall effect in double quantum wells.

Y. W. Suen; J. Jo; M. B. Santos; L. W. Engel; S. W. Hwang; M. Shayegan

1991-09-15T23:59:59.000Z

11

Electrical resistance standards and the quantum Hall effect  

Science Journals Connector (OSTI)

This review of electrical resistance standards begins with a description of classical standard resistors and their limitations. Methods of comparing resistance are described; these include bridges based on cryogeniccurrentcomparators capable of achieving statistical uncertainties approaching one part in 10 10 in the measurement of resistance ratios. Such reproducibility is nearly two orders of magnitude smaller than the overall uncertainty of the most accurate determinations of the ohm from its SI definition via the calculable capacitor. The quantum Hall effect can provide an invariable reference standard of resistance linked to the fundamental physical constants. Many factors however limit the accuracy of practical realizations of quantized Hall resistance standards. Ultimately the accuracy of a specific realization must be confirmed by comparison with similar standards; methods for doing this and the resulting agreement are presented. The ac techniques used in the determinations of the SI ohm by means of the calculable capacitor are now being applied to accurately link the quantized Hall resistance to the impedance of standard capacitors and thereby to provide a new reference standard of capacitance.

Thomas J. Witt

1998-01-01T23:59:59.000Z

12

PREPRINT QUASIPARTICLE AGGREGATION I N THE FRACTIONAL QUANTUM HALL EFFECT  

NLE Websites -- All DOE Office Websites (Extended Search)

91618 91618 PREPRINT QUASIPARTICLE AGGREGATION I N THE FRACTIONAL QUANTUM HALL EFFECT R. B. Laughlin This paper was prepared for submittal to the Proceedings of the 17th International Conference on the Physics of Semi conductors San Francisco, California August 6-10, 1984 October 10, 1984 This is a preprint of a paper intended for publication in a journal or proceedings. Since changes may be made before publication, this preprint is made available with the un- derstanding that it will not be cited or reproduced without the permission of the author. DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency Thereof, nor any of their employees,

13

Contour dynamics, waves, and solitons in the quantum Hall effect  

Science Journals Connector (OSTI)

We present a theoretical study of the excitations on the edge of a two-dimensional electron system in a perpendicular magnetic field in terms of a contour dynamics formalism. In particular, we focus on edge excitations in the quantum Hall effect. Beyond the usual linear approximation, a nonlinear analysis of the shape deformations of an incompressible droplet yields soliton solutions which correspond to shapes that propagate without distortion. A perturbative analysis is used and the results are compared to analogous systems, like vortex patches in ideal hydrodynamics. Under a local induction approximation, we find that the contour dynamics is described by a nonlinear partial differential equation for the curvature: the modified Kortewegde Vries equation.

C. Wexler and Alan T. Dorsey

1999-10-15T23:59:59.000Z

14

Quantum Hall effect and Landau-level crossing of Dirac fermions in trilayer graphene  

E-Print Network (OSTI)

The physics of Dirac fermions in condensed-matter systems has received extraordinary attention following the discoveries of two new types of quantum Hall effect in single-layer and bilayer graphene1, 2, 3. The electronic ...

Taychatanapat, Thiti

15

Toward theory of quantum Hall effect in graphene  

E-Print Network (OSTI)

We analyze a gap equation for the propagator of Dirac quasiparticles and conclude that in graphene in a magnetic field, the order parameters connected with the quantum Hall ferromagnetism dynamics and those connected with the magnetic catalysis dynamics necessarily coexist (the latter have the form of Dirac masses and correspond to excitonic condensates). This feature of graphene could lead to important consequences, in particular, for the existence of gapless edge states. Solutions of the gap equation corresponding to recently experimentally discovered novel plateaus in graphene in strong magnetic fields are described.

E. V. Gorbar; V. P. Gusynin; V. A. Miransky

2007-10-18T23:59:59.000Z

16

The quantization of topology, from quantum Hall effect to quantum gravity  

E-Print Network (OSTI)

It is the goal of this article to extend the notion of quantization from the standard interpretation focused on non-commuting observables defined starting from classical analogues, to the topological equivalents defined in terms of coefficient groups in (co)homology. It is shown that the commutation relations between quantum observables become (non)compatibility relations between coefficient groups. The main result is the construction of a new, higher-level form of quantization, as seen from the perspective of the universal coefficient theorem. This idea brings us closer to a consistent quantization of gravity, allows for a systematic description of topology changing string interactions but also gives new, quantum-topological degrees of freedom in discussions involving quantum information. On the practical side, a possible connection to the fractional quantum Hall effect is explored.

Andrei T. Patrascu

2014-11-17T23:59:59.000Z

17

Half-integer quantum Hall effect of disordered Dirac fermions at a topological insulator surface  

Science Journals Connector (OSTI)

The unconventional (half-integer) quantum Hall effect for a single species of Dirac fermions is analyzed. We discuss possible experimental measurements of the half-integer Hall conductance gxy of topological insulator surface states and explain how to reconcile Laughlin's flux insertion argument with half-integer gxy. Using a vortex state representation of Landau level wave functions, we calculate current density beyond linear response, which is in particular relevant to the topological image monopole effect. As a major result, the field theory describing the localization physics of the quantum Hall effect of a single species of Dirac fermions is derived. In this connection, the issue of (absent) parity anomaly is revisited. The renormalization group (RG) flow and the resulting phase diagram are extensively discussed. Starting values of the RG flow are given by the semiclassical conductivity tensor which is obtained from the Boltzmann transport theory of the anomalous Hall effect.

E. J. Knig; P. M. Ostrovsky; I. V. Protopopov; I. V. Gornyi; I. S. Burmistrov; A. D. Mirlin

2014-10-28T23:59:59.000Z

18

Split-quaternionic Hopf map, quantum Hall effect, and twistor theory  

SciTech Connect

Introducing a noncompact version of the Hopf map, we demonstrate remarkable close relations between quantum Hall effect and twistor theory. We first construct quantum Hall effect on a hyperboloid based on the noncompact 2nd Hopf map of split-quaternions. We analyze a hyperbolic one-particle mechanics, and explore many-body problem, where a many-body ground state wave function and membrane-like excitations are derived explicitly. In the lowest Landau level, the symmetry is enhanced from SO(3,2) to the SU(2,2) conformal symmetry. We point out that the quantum Hall effect naturally realizes the philosophy of twistor theory. In particular, emergence mechanism of fuzzy space-time is discussed somehow in detail.

Hasebe, Kazuki [Department of General Education, Kagawa National College of Technology, Takuma-cho, Mitoyo-city, Kagawa 769-1192 (Japan)

2010-02-15T23:59:59.000Z

19

Title: Electron-Hole Asymmetric Integer and Fractional Quantum Hall Effect in Bilayer Graphene  

E-Print Network (OSTI)

Title: Electron-Hole Asymmetric Integer and Fractional Quantum Hall Effect in Bilayer Graphene graphene is predicted to pro- duce novel and tunable FQH ground states. Here we present local electronic compressibility measurements of the FQH effect in the lowest Landau level of bilayer graphene. We observe

Yacoby, Amir

20

A novel method of including Landau level mixing in numerical studies of the quantum Hall effect  

SciTech Connect

Landau level mixing should influence the quantum Hall effect for all except the strongest applied magnetic fields. We propose a simple method for examining the effects of Landau level mixing by incorporating multiple Landau levels into the Haldane pseudopotentials through exact numerical diagonalization. Some of the resulting pseudopotentials for the lowest and first excited Landau levels will be presented.

Wooten, Rachel; Quinn, John; Macek, Joseph [Department of Physics and Astronomy, University of Tennessee, Knoxville TN 37996-1501 (United States)

2013-12-04T23:59:59.000Z

Note: This page contains sample records for the topic "quantum hall effect" 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

Engineering the quantum anomalous Hall effect in graphene with uniaxial strains  

SciTech Connect

We theoretically investigate the manipulation of the quantum anomalous Hall effect (QAHE) in graphene by means of the uniaxial strain. The values of Chern number and Hall conductance demonstrate that the strained graphene in presence of Rashba spin-orbit coupling and exchange field, for vanishing intrinsic spin-orbit coupling, possesses non-trivial topological phase, which is robust against the direction and modulus of the strain. Besides, we also find that the interplay between Rashba and intrinsic spin-orbit couplings results in a topological phase transition in the strained graphene. Remarkably, as the strain strength is increased beyond approximately 7%, the critical parameters of the exchange field for triggering the quantum anomalous Hall phase transition show distinct behaviorsdecrease (increase) for strains along zigzag (armchair) direction. Our findings open up a new platform for manipulation of the QAHE by an experimentally accessible strain deformation of the graphene structure, with promising application on novel quantum electronic devices with high efficiency.

Diniz, G. S., E-mail: ginetom@gmail.com; Guassi, M. R. [Institute of Physics, University of Braslia, 70919-970 Braslia-DF (Brazil); Qu, F. [Institute of Physics, University of Braslia, 70919-970 Braslia-DF (Brazil); Department of Physics, The University of Texas at Austin, Austin, Texas 78712 (United States)

2013-12-28T23:59:59.000Z

22

Half integer quantum Hall effect in high mobility single layer epitaxial graphene  

E-Print Network (OSTI)

Half integer quantum Hall effect in high mobility single layer epitaxial graphene Xiaosong Wu,1 of is demonstrated here on a single graphene layer grown on the C-face of 4H silicon carbide. The mobility is 20 000. This is comparable to the best exfoliated graphene flakes on SiO2 and an order of magnitude larger than Si

23

Non-Commutative Geometry in Higher Dimensional Quantum Hall Effect as A-Class Topological Insulator  

E-Print Network (OSTI)

We clarify relations between the higher dimensional quantum Hall effect and A-class topological insulator. In particular, we elucidate physical implications of the higher dimensional non-commutative geometry in the context of A-class topological insulator. This presentation is based on arXiv:1403.5066.

Kazuki Hasebe

2014-08-04T23:59:59.000Z

24

Non-Commutative Geometry in Higher Dimensional Quantum Hall Effect as A-Class Topological Insulator  

E-Print Network (OSTI)

We clarify relations between the higher dimensional quantum Hall effect and A-class topological insulator. In particular, we elucidate physical implications of the higher dimensional non-commutative geometry in the context of A-class topological insulator. This presentation is based on arXiv:1403.5066.

Hasebe, Kazuki

2014-01-01T23:59:59.000Z

25

Viscosity of Quantum Hall Fluids  

Science Journals Connector (OSTI)

The viscosity of quantum fluids with an energy gap at zero temperature is related to the adiabatic curvature on the space parametrizing flat background metrics. For quantum Hall fluids on two-dimensional tori, the quantum viscosity is computed. It turns out to be isotropic, constant, and proportional to the magnetic field strength.

J. E. Avron; R. Seiler; P. G. Zograf

1995-07-24T23:59:59.000Z

26

Quantum anomalous Hall effect with cold atoms trapped in a square lattice  

E-Print Network (OSTI)

in the recently discovered graphene system since the required staggered magnetic flux in the model is extremely hard to achieve. A recent proposal predicts the QAHE in the Hg1?xMnxTe quantum wells [6] by doping Mn atoms in the quantum spin Hall system...

Liu, Xiong-Jun; Liu, Xin; Wu, Congjun; Sinova, Jairo

2010-01-01T23:59:59.000Z

27

Dynamics in the quantum Hall effect and the phase diagram of graphene  

E-Print Network (OSTI)

The dynamics responsible for lifting the degeneracy of the Landau levels in the quantum Hall (QH) effect in graphene is studied by utilizing a low-energy effective model with a contact interaction. A detailed analysis of the solutions of the gap equation for Dirac quasiparticles is performed at both zero and nonzero temperatures. The characteristic feature of the solutions is that the order parameters connected with the QH ferromagnetism and magnetic catalysis scenarios necessarily coexist. The solutions reproduce correctly the experimentally observed novel QH plateaus in graphene in strong magnetic fields. The phase diagram of this system in the plane of temperature and electron chemical potential is analyzed. The phase transitions corresponding to the transitions between different QH plateaus in graphene are described.

E. V. Gorbar; V. P. Gusynin; V. A. Miransky; I. A. Shovkovy

2008-08-28T23:59:59.000Z

28

Low Temperature and High Frequency Investigation of the Quantum Hall Effect  

E-Print Network (OSTI)

To study the properties of quantum Hall devices at microwave frequencies, I will build a high frequency probe capable of operating at ultra-low temperatures. The probe will be fitted with low loss coax to carry excitation photons at microwave frequencies to samples sitting at a temperature of 10 mK inside a dilution refrigerator. A second coax will bring the resulting signal back to detectors at room temperature. The project will involve the design of such a probe, its construction, and the eventual test of its performance through study of quantum Hall interferometers at ultra-low temperatures. I will look for evidence of quantum Hall-like states that emerge at relatively low magnetic fields when a twodimensional electron gas is illuminated by microwave photons. A successful observation

Tankut Can; St Draft

2009-01-01T23:59:59.000Z

29

Superlattices and Microstructures, Vol. 22, No. 4, 1997 Current distribution in the integer quantum Hall effect: The role of  

E-Print Network (OSTI)

. Experimental setup The two-dimensional electron gas sample was fabricated from GaAs/AlGaAs heterostructures, Tel-Aviv University, Tel-Aviv 69978, Israel Hadas Shtrikman Department of Condensed Matter currents in a two-dimensional electron gas under the conditions of the integer quantum Hall effect (IQHE

Palevski, Alexander

30

Fractional Quantum Hall States in Graphene  

E-Print Network (OSTI)

We quantum mechanically analyze the fractional quantum Hall effect in graphene. This will be done by building the corresponding states in terms of a potential governing the interactions and discussing other issues. More precisely, we consider a system of particles in the presence of an external magnetic field and take into account of a specific interaction that captures the basic features of the Laughlin series \

Ahmed Jellal; Bellati Malika

2008-05-15T23:59:59.000Z

31

Dynamical mass generation of composite Dirac fermions and fractional quantum Hall effects near charge neutrality in graphene  

Science Journals Connector (OSTI)

We develop a composite Dirac fermion theory for the fractional quantum Hall effects (QHE) near charge neutrality in graphene. We show that the interactions between the composite Dirac fermions lead to a dynamical mass generation through exciton condensation. The four-fold spinvalley degeneracy is fully lifted due to the mass generation and exchange effects such that the odd-denominator fractional QHE observed in the vicinity of charge neutrality can be understood in terms of the integer QHE of composite Dirac fermions. At a filling factor ?=1/2, we show that the massive composite Dirac fermion liquid is unstable against chiral p-wave pairing for weak Coulomb interactions and the ground state is a paired non-Abelian quantum Hall state described by the MooreRead Pfaffian in the long wavelength limit.

Feng Cai; Yue Yu; Ziqiang Wang

2013-01-01T23:59:59.000Z

32

Engineering of Quantum Hall Effect from Type IIA String Theory on The K3 Surface  

E-Print Network (OSTI)

Using D-brane configurations on the K3 surface, we give six dimensional type IIA stringy realizations of the Quantum Hall Effect (QHE) in 1+2 dimensions. Based on the vertical and horizontal lines of the K3 Hodge diamond, we engineer two different stringy realizations. The vertical line presents a realization in terms of D2 and D6-branes wrapping the K3 surface. The horizontal one is associated with hierarchical stringy descriptions obtained from a quiver gauge theory living on a stack of D4-branes wrapping intersecting 2-spheres embedded in the K3 surface with deformed singularities. These geometries are classified by three kinds of the Kac-Moody algebras: ordinary, i.e finite dimensional, affine and indefinite. We find that no stringy QHE in 1+2 dimensions can occur in the quiver gauge theory living on intersecting 2-spheres arranged as affine Dynkin diagrams. Stringy realizations of QHE can be done only for the finite and indefinite geometries. In particular, the finite Lie algebras give models with fractional filling fractions, while the indefinite ones classify models with negative filling fractions which can be associated with the physics of holes in the graphene.

Adil Belhaj; Antonio Segui

2010-07-02T23:59:59.000Z

33

Topological Spin Texture in a Quantum Anomalous Hall Insulator  

E-Print Network (OSTI)

The quantum anomalous Hall (QAH) effect has been recently discovered in an experiment using a thin-film topological insulator with ferromagnetic ordering and strong spin-orbit coupling. Here we investigate the spin degree ...

Wu, Jiansheng

34

Collapse of integer Hall gaps in a double-quantum-well system  

Science Journals Connector (OSTI)

For coupled double-quantum-well systems in which tunneling is important, the symmetric to antisymmetric energy gap leads to a quantum Hall effect. In this Letter we show that interaction effects in strong magnetic fields can destroy this gap, and present a theory which predicts the occurrence or nonoccurrence of a quantum Hall effect.

A. H. MacDonald; P. M. Platzman; G. S. Boebinger

1990-08-06T23:59:59.000Z

35

Fractional Quantization of the Hall Effect  

DOE R&D Accomplishments (OSTI)

The Fractional Quantum Hall Effect is caused by the condensation of a two-dimensional electron gas in a strong magnetic field into a new type of macroscopic ground state, the elementary excitations of which are fermions of charge 1/m, where m is an odd integer. A mathematical description is presented.

Laughlin, R. B.

1984-02-27T23:59:59.000Z

36

Decoherence induced by magnetic impurities in a quantum hall system  

SciTech Connect

Scattering by magnetic impurities is known to destroy coherence of electron motion in metals and semiconductors. We investigate the decoherence introduced in a single act of electron scattering by a magnetic impurity in a quantum Hall system. For this, we introduce a fictitious nonunitary scattering matrix for electrons that reproduces the exactly calculated scattering probabilities. The strength of decoherence is identified by the deviation of eigenvalues of the product from unity. Using the fictitious scattering matrix, we estimate the width of the metallic region at the quantum Hall effect inter-plateau transition and its dependence on the exchange coupling strength and the degree of polarization of magnetic impurities.

Kagalovsky, V. [Shamoon College of Engineering (Israel); Chudnovskiy, A. L., E-mail: alexander.chudnovskiy@gmail.com [Universitat Hamburg, I. Institut fuer Theoretische Physik (Germany)

2013-04-15T23:59:59.000Z

37

Viscosity of Quantum Hall Fluids J. E. Avron  

E-Print Network (OSTI)

Viscosity of Quantum Hall Fluids J. E. Avron Department of Physics, Technion, 32000 Haifa, Israel R April 25, 1997 Abstract The viscosity of quantum fluids with an energy gap at zero temperature is non of the parameter space). For a quantum Hall fluid on two dimensional tori this viscosity is computed. In this case

38

Josephson inplane and tunneling currents in bilayer quantum Hall system  

SciTech Connect

A Bose-Einstein condensation is formed by composite bosons in the quantum Hall state. A composite boson carries the fundamental charge (e). We investigate Josephson tunneling of such charges in the bilayer quantum Hall system at the total filling ? = 1. We show the existence of the critical current for the tunneling current to be coherent and dissipationless in tunneling experiments with various geometries.

Ezawa, Z. F. [Nishina Center, RIKEN, Saitama 351-0198 (Japan); Tsitsishvili, G. [Georgia Department of Physics, Tbilisi State University, Tbilisi 0179 (Georgia); Sawada, A. [Research Center for Low Temperature and Materials Sciences, Kyoto University, Kyoto 606-8501 (Japan)

2013-12-04T23:59:59.000Z

39

Planar Hall effect bridge magnetic field sensors  

SciTech Connect

Until now, the planar Hall effect has been studied in samples with cross-shaped Hall geometry. We demonstrate theoretically and experimentally that the planar Hall effect can be observed for an exchange-biased ferromagnetic material in a Wheatstone bridge topology and that the sensor signal can be significantly enhanced by a geometric factor. For the samples in the present study, we demonstrate an enhancement of the sensor output by a factor of about 100 compared to cross-shaped sensors. The presented construction opens a new design and application area of the planar Hall effect, which we term planar Hall effect bridge sensors.

Henriksen, A. D.; Dalslet, B. T.; Skieller, D. H.; Lee, K. H.; Okkels, F.; Hansen, M. F. [Department of Micro- and Nanotechnology, DTU Nanotech, Technical University of Denmark, Building 345 East, DK-2800 Kongens Lyngby (Denmark)

2010-07-05T23:59:59.000Z

40

Hall effect in the two-dimensional Luttinger liquid  

Science Journals Connector (OSTI)

The temperature dependence of the Hall effect in the normal state is a commom theme of all the cuprate superconductors and has been one of the more puzzling observations on these puzzling materials. We describe a general scheme within the Luttinger liquid theory of these two-dimensional quantum fluids which corrrelates the anomalous Hall and resistivity observations on a wide variety of both pure and doped single crystals, especially the data in the accompanying Letter of Chien, Wang, and Ong.

P. W. Anderson

1991-10-07T23:59:59.000Z

Note: This page contains sample records for the topic "quantum hall effect" 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

Hall effect in a plasma  

Science Journals Connector (OSTI)

In low?density plasmas such as the positive columns of glow discharges the Hall effect is very large and easily observable. An elementary analysis reproduced here shows that the Hall voltage between opposite sides of such a column measures only half of that expected ideally in a conductor with the same carrier density. The reduction is caused by ambipolar diffusion of the carriers whose density distribution is distorted in the presence of a transverse magnetic field. A simple experimental arrangement is described in which the Hall voltage across a helium discharge column is determined as a function of magnetic field discharge current and gas pressure. Thus electron drift velocity and density are inferred. A simultaneous measurement of the resistivity then permits evaluation of the collision frequency. If the collision cross section for scattering of electrons by helium atoms is given the electron temperature can be estimated. Variation of the parameters thus permits a study of the scaling laws for the glow discharge column. The experiment is found to be a very rewarding educational experience.

W. B. Kunkel

1981-01-01T23:59:59.000Z

42

High Field Quantum Spin Hall State in Graphene  

NLE Websites -- All DOE Office Websites (Extended Search)

quantum spin Hall (QSH) state-the paradigmatic two dimensional SPT phase-in monolayer graphene. In a QSH state, electrons with opposite spin polarization carry current in opposite...

43

Spin-Charge Separation in the Quantum Spin Hall State  

Science Journals Connector (OSTI)

The quantum spin Hall state is a topologically nontrivial insulator state protected by the time-reversal symmetry. We show that such a state always leads to spin-charge separation in the presence of a ? flux. Our result is generally valid for any interacting system. We present a proposal to experimentally observe the phenomenon of spin-charge separation in the recently discovered quantum spin Hall system.

Xiao-Liang Qi and Shou-Cheng Zhang

2008-08-19T23:59:59.000Z

44

Hall-effect arc protector  

DOE Patents (OSTI)

The Hall-Effect Arc Protector is used to protect sensitive electronics from high energy arcs. The apparatus detects arcs by monitoring an electrical conductor, of the instrument, for changes in the electromagnetic field surrounding the conductor which would be indicative of a possible arcing condition. When the magnitude of the monitored electromagnetic field exceeds a predetermined threshold, the potential for an instrument damaging are exists and the control system logic activates a high speed circuit breaker. The activation of the breaker shunts the energy imparted to the input signal through a dummy load to the ground. After the arc condition is terminated, the normal signal path is restored.

Rankin, Richard A. (Ammon, ID); Kotter, Dale K. (Shelley, ID)

1997-01-01T23:59:59.000Z

45

Hall-effect arc protector  

DOE Patents (OSTI)

The Hall-Effect Arc Protector is used to protect sensitive electronics from high energy arcs. The apparatus detects arcs by monitoring an electrical conductor, of the instrument, for changes in the electromagnetic field surrounding the conductor which would be indicative of a possible arcing condition. When the magnitude of the monitored electromagnetic field exceeds a predetermined threshold, the potential for an instrument damaging are exists and the control system logic activates a high speed circuit breaker. The activation of the breaker shunts the energy imparted to the input signal through a dummy load to the ground. After the arc condition is terminated, the normal signal path is restored. 2 figs.

Rankin, R.A.; Kotter, D.K.

1997-05-13T23:59:59.000Z

46

Edge and Impurity Effects on Quantization of Hall Currents  

E-Print Network (OSTI)

's for- mula provided the Fermi energy lies in such a gap1 . Let us recall that the bulk conductance has in a strip along the edge (decaying perturbations far from the edge are also allowed). This enables us of the edge theory for the quantum Hall effect have not been given yet a rigourous mathemati- cal status

47

Quantum Hall Charge Sensor for Single-Donor Nuclear Spin Detection in Silicon  

E-Print Network (OSTI)

We propose a novel optical and electrical hybrid scheme for the measurement of nuclear spin qubits in silicon. By combining the environmental insensitivity of the integer quantum Hall effect with the optically distinguishable hyperfine states of phosphorus impurities in silicon, our system can simultaneously offer nuclear spin measurement and robustness against environmental defects. 31P donor spins in isotopically purified 28Si are often discussed as very promising quantum memory qubits due to their extremely long decoherence times, and our proposed device offers an effective implementation for such a quantum memory system.

Sleiter, D; Nozawa, K; Ladd, T D; Thewalt, M L W; Yamamoto, Y

2010-01-01T23:59:59.000Z

48

Quantum Hall Charge Sensor for Single-Donor Nuclear Spin Detection in Silicon  

E-Print Network (OSTI)

We propose a novel optical and electrical hybrid scheme for the measurement of nuclear spin qubits in silicon. By combining the environmental insensitivity of the integer quantum Hall effect with the optically distinguishable hyperfine states of phosphorus impurities in silicon, our system can simultaneously offer nuclear spin measurement and robustness against environmental defects. 31P donor spins in isotopically purified 28Si are often discussed as very promising quantum memory qubits due to their extremely long decoherence times, and our proposed device offers an effective implementation for such a quantum memory system.

D. Sleiter; N. Y. Kim; K. Nozawa; T. D. Ladd; M. L. W. Thewalt; Y. Yamamoto

2010-05-12T23:59:59.000Z

49

NambuGoldstone modes and the Josephson supercurrent in the bilayer quantum Hall system  

Science Journals Connector (OSTI)

......effect on the Hall resistance in the CAF phase in...phase We now study the electric Josephson supercurrent...the anomalous Hall resistance behaviours affected...the anomalous Hall resistance (179) and (180...standard notation from elementary particle physics......

Yusuke Hama; George Tsitsishvili; Zyun F. Ezawa

2013-05-01T23:59:59.000Z

50

Photo-Hall Effect in Anthracene  

Science Journals Connector (OSTI)

The Hall mobility for photogenerated carriers has been measured in anthracene crystals in the temperature range from -40 to 60C. Two-carrier effects were found to dominate, so that only lower limits could be calculated for the mobility. Near room temperature, the Hall mobility exceeds 50 cm2V-1sec-1 for electrons and 30 cm2V-1sec-1 for holes, compared with values close to 1 cm2V-1sec-1 measured for the drift mobility. The most likely explanation for this difference is a change in transport properties with illumination level. The existence of the anomalous Hall effect predicted by LeBlanc and Friedman could not be verified.

J. Dresner

1966-03-11T23:59:59.000Z

51

Evidence for spontaneous interlayer phase coherence in a bilayer quantum Hall exciton condensate  

E-Print Network (OSTI)

double layer 2D electron gas sample. There are several equivalent ways to view the strongly correlatedEvidence for spontaneous interlayer phase coherence in a bilayer quantum Hall exciton condensate J of the excitonic Bose condensate which describes this remarkable quantum Hall state. q 2003 Published by Elsevier

Eisenstein, Jim

52

Landau-level dispersion and the quantum Hall plateaus in bilayer graphene  

SciTech Connect

We study the quantum Hall effect (QHE) in bilayer graphene using the Kubo-Greenwood formula. At zero temperature the Hall conductivity ?{sub yx} is given by ?{sub yx}?=?4(N+1)e{sup 2}/h with N the index of the highest occupied Landau level (LL). Including the dispersion of the LLs and their width, due to e.g. scattering by impurities, produces the plateau of the n = 0 LL in agreement with experimental results on doped samples and similar theoretical results on single-layer graphene plateaus widen with impurity concentration. Further, the evaluated resistivity ?{sub xx} exhibits a strong, oscillatory dependence on the electron concentration. Explicit results are obtained for ?-function impurities.

Zarenia, M.; Peeters, F. M. [Department of Physics, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerpen (Belgium); Vasilopoulos, P.; Pourtolami, N. [Concordia University, Department of Physics, 7141 Sherbrooke Ouest, Montral, Qubec (Canada)

2013-12-04T23:59:59.000Z

53

Hall Effect, Magnetoresistance, and Size Effects in Copper  

Science Journals Connector (OSTI)

Measurements of the Hall coefficient of several annealed polycrystalline Cu strips of resistivity ratio ?(273K)?(4.2K)?450 and thicknesses ranging from 0.05 to 1.6 mm have revealed the existence of a marked size effect at low temperatures. The effect is orders of magnitude greater than that to be expected on the basis of free-electron theory. It is suggested that earlier low-temperature data on the Hall effect of thin high-purity samples are subject to uncertainties arising from such effects. Size effects were also evident in the transverse magnetoresistance. At high fields, a tendency toward saturation in the transverse magnetoresistance was observed for thick samples. The temperature dependence of the Hall coefficient has also been studied.

Ted G. Berlincourt

1958-10-15T23:59:59.000Z

54

Edge tunneling and transport in non-abelian fractional quantum Hall systems  

E-Print Network (OSTI)

Several aspects of tunneling at the edge of a fractional quantum Hall (FQH) state are studied. Most examples are given for the non- abelian filling fraction ? = 5 2 Moore-Read Pfaffian state. For tunneling between opposite ...

Overbosch, Bas Jorn

2008-01-01T23:59:59.000Z

55

Combination rules, charge symmetry, and Hall effect in cuprates  

Science Journals Connector (OSTI)

The rule relating the observed Hall coefficient to the spin and charge responses of the uniform doped Mott insulator is derived. It is essential to include the contribution of holon and spinon three-current correlations to the effective action of the gauge field. In the vicinity of the Mott insulating point the Hall coefficient is holon dominated and weakly temperature dependent. In the vicinity of a point of charge conjugation symmetry, the holon contribution to the observed Hall coefficient is small: the Hall coefficient follows the temperature dependence of the diamagnetic susceptibility with a sign determined by the Fermi-surface shape.

A. J. Schofield and J. M. Wheatley

1993-05-01T23:59:59.000Z

56

Cathode Effects in Cylindrical Hall Thrusters  

SciTech Connect

Stable operation of a cylindrical Hall thruster (CHT) has been achieved using a hot wire cathode, which functions as a controllable electron emission source. It is shown that as the electron emission from the cathode increases with wire heating, the discharge current increases, the plasma plume angle reduces, and the ion energy distribution function shifts toward higher energies. The observed effect of cathode electron emission on thruster parameters extends and clarifies performance improvements previously obtained for the overrun discharge current regime of the same type of thruster, but using a hollow cathode-neutralizer. Once thruster discharge current saturates with wire heating, further filament heating does not affect other discharge parameters. The saturated values of thruster discharge parameters can be further enhanced by optimal placement of the cathode wire with respect to the magnetic field.

Granstedt, E.M.; Raitses, Y.; Fisch, N. J.

2008-09-12T23:59:59.000Z

57

Hall effect at a tunable metal-insulator transition  

E-Print Network (OSTI)

Using a rotating magnetic field, the Hall effect in three-dimensional amorphous GdxSi1-x has been measured in the critical regime of the metal-insulator transition for a constant total magnetic field. The Hall coefficient R-0 is negative, indicating...

Teizer, Winfried; Hellman, F.; Dynes, RC.

2003-01-01T23:59:59.000Z

58

Rotating Plasma Effects in Cylindrical Hall Thrusters Nathaniel J. Fisch and Yevgeny Raitses  

E-Print Network (OSTI)

temperature effects observed in the PPPL cylindrical Hall thruster in the very promising current overrun

59

Cryogenic scanning force microscopy of quantum Hall samples: Adiabatic transport originating in anisotropic depletion at contact interfaces  

Science Journals Connector (OSTI)

Anisotropic magnetoresistances and intrinsic adiabatic transport features are generated on quantum Hall samples based on an (Al,Ga)As/GaAs heterostructure with alloyed Au/Ge/Ni contacts. We succeed to probe the microscopic origin of these transport features with a cryogenic scanning force microscope by measuring the local potential distribution within the two-dimensional electron system (2DES). These local measurements reveal the presence of an incompressible strip in front of contacts with insulating properties depending on the orientation of the contact/2DES interface line relatively to the crystal axes of the heterostructure. Such an observation gives another microscopic meaning to the term nonideal contact used in context with the Landauer-Bttiker formalism applied to the quantum Hall effect.

F. Dahlem; E. Ahlswede; J. Weis; K. v. Klitzing

2010-09-10T23:59:59.000Z

60

Kinetic Effects In Hall Thruster Discharge  

E-Print Network (OSTI)

of a capacitive discharge. 4 capacitive discharge. For more info: V. Godyak, IEEE TPS 34, 755 (2006). #12 th twall interactions in Hall thrusters Large electron temperature andE JH~1cm secondary electron emission result in large particle and wall losses to the wall E , Jz z Br H~1cm 120 eV High SEE BN channel

Kaganovich, Igor

Note: This page contains sample records for the topic "quantum hall effect" 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

Generic Wave-Function Description of Fractional Quantum Anomalous Hall States and Fractional Topological Insulators  

Science Journals Connector (OSTI)

We propose a systematical approach to construct generic fractional quantum anomalous Hall states, which are generalizations of the fractional quantum Hall states to lattice models with zero net magnetic field and full lattice translation symmetry. Local and translationally invariant Hamiltonians can also be constructed, for which the proposed states are unique ground states. Our result demonstrates that generic chiral topologically ordered states can be realized in lattice models, without requiring magnetic translation symmetry and Landau level structure. We further generalize our approach to fractional topological insulators, and provide the first explicit wave-function description of fractional topological insulators in the absence of spin conservation.

Xiao-Liang Qi

2011-09-15T23:59:59.000Z

62

Color Glass Condensates in dense quark matter and quantum Hall states of gluons  

E-Print Network (OSTI)

We apply the effective theory of color glass condensate to the analysis of gluon states in dense quark matter, in which the saturation region of gluons is also present. We find that in the region two point function of gluons shows algebraic long range order. The order is completely the same as the one gluons show in the dense quark matter, which form quantum Hall states. The order leads to the vanishing of massless gluon pole. We also find that the saturation region of gluons extends from small $x$ to even large $x\\lesssim 1$ in much dense quark matter. We point out a universality that the color glass condensate is a property of hadrons at high energy and of quark matter at high baryon density.

Aiichi Iwazaki

2006-04-26T23:59:59.000Z

63

"Impact of heavy adatom segregation on the quantum spin Hall phase in graphene"  

E-Print Network (OSTI)

"Impact of heavy adatom segregation on the quantum spin Hall phase in graphene" Impartido por physics is to realize a topological insulating phase in 2-dimensional Graphene [1,2]. Recent theoretical studies have shown that dissipation-less edge conducting channels emerge in graphene nanoribbons when

Escolano, Francisco

64

"Impact of heavy adatom segregation on the quantum spin Hall phase in graphene"  

E-Print Network (OSTI)

"Impact of heavy adatom segregation on the quantum spin Hall phase in graphene" Impartit per: David physics is to realize a topological insulating phase in 2-dimensional Graphene [1,2]. Recent theoretical studies have shown that dissipation-less edge conducting channels emerge in graphene nanoribbons when

Escolano, Francisco

65

"Impact of heavy adatom segregation on the quantum spin Hall phase in graphene"  

E-Print Network (OSTI)

"Impact of heavy adatom segregation on the quantum spin Hall phase in graphene" By: David Soriano is to realize a topological insulating phase in 2-dimensional Graphene [1,2]. Recent theoretical studies have shown that dissipation-less edge conducting channels emerge in graphene nanoribbons when doped with soft

Escolano, Francisco

66

Quantum Hall Effect in n-p-n and n-2D Topological Insulator-n Junctions G. M. Gusev,1  

E-Print Network (OSTI)

~o Paulo, 135960-170 Sa~o Paulo, SP, Brazil 2 Institute of Semiconductor Physics, Novosibirsk 630090 effect (QHE) has been renewed due to observation of the conductance quantization in the locally gated equal to 6.3 nm, the energy spectrum becomes inverted and one changes to a two-dimensional topological

Gusev, Guennady

67

Study of the effects of guide field on Hall reconnection  

SciTech Connect

The results from guide field studies on the Magnetic Reconnection Experiment (MRX) are compared with results from Hall magnetohydrodynamic (HMHD) reconnection simulation with guide field. The quadrupole field, a signature of two-fluid reconnection at zero guide field, is modified by the presence of a finite guide field in a manner consistent with HMHD simulation. The modified Hall current profile contains reduced electron flows in the reconnection plane, which quantitatively explains the observed reduction of the reconnection rate. The present results are consistent with the hypothesis that the local reconnection dynamics is dominated by Hall effects in the collisionless regime of the MRX plasmas. While very good agreement is seen between experiment and simulations, we note that an important global feature of the experiments, a compression of the guide field by the reconnecting plasma, is not represented in the simulations.

Tharp, T. D.; Yamada, M.; Ji, H.; Lawrence, E.; Dorfman, S.; Myers, C.; Yoo, J. [Center for Magnetic Self-Organization, Princeton Plasma Physics Laboratory, P.O. Box 451, Princeton, New Jersey 08543-0451 (United States)] [Center for Magnetic Self-Organization, Princeton Plasma Physics Laboratory, P.O. Box 451, Princeton, New Jersey 08543-0451 (United States); Huang, Y.-M.; Bhattacharjee, A. [Space Science Center, University of New Hampshire and Max Planck-Princeton Research Center for Plasma Physics, Princeton University, P.O. Box 451, Princeton, New Jersey 08543-0451 (United States)] [Space Science Center, University of New Hampshire and Max Planck-Princeton Research Center for Plasma Physics, Princeton University, P.O. Box 451, Princeton, New Jersey 08543-0451 (United States)

2013-05-15T23:59:59.000Z

68

Theory of the Anomalous Hall Effect in the Insulating Regime  

E-Print Network (OSTI)

, the AHE was revived in recent years by generating many new understandings and phenomena, e.g. spin-Hall effect, topological insulators. The phase diagram of the AHE was shown recently to exhibit three distinct regions: a skew scattering region in the high...

Liu, Xiongjun

2012-10-19T23:59:59.000Z

69

Mass Flow Control in a Magnesium Hall-effect Thruster Mark A. Hopkins*  

E-Print Network (OSTI)

Mass Flow Control in a Magnesium Hall-effect Thruster Mark A. Hopkins* , Jason M. Makela , Robert L reported in this paper examined methods of operating a Hall-effect thruster on solid magnesium propellant University began performing experiments using magnesium and zinc as propellants for a Hall-effect thruster1

King, Lyon B.

70

Quantum Hall Effect in Hydrogenated Graphene  

NLE Websites -- All DOE Office Websites (Extended Search)

Studies of a Mn(III)-Cu(II) Dimer Containing a Jahn-Teller Compressed Mn Ion 43 Giant Ising-type Magnetic Anisotropy in Trigonal Bipyramidal Ni(II) Complexes 44 Atmospheric...

71

Hall effect in a strong magnetic field: Direct comparisons of compressible magnetohydrodynamics and the reduced Hall magnetohydrodynamic equations  

SciTech Connect

In this work we numerically test a model of Hall magnetohydrodynamics in the presence of a strong mean magnetic field: the reduced Hall magnetohydrodynamic model (RHMHD) derived by [Gomez et al., Phys. Plasmas 15, 102303 (2008)] with the addition of weak compressible effects. The main advantage of this model lies in the reduction of computational cost. Nevertheless, up until now the degree of agreement with the original Hall MHD system and the range of validity in a regime of turbulence were not established. In this work direct numerical simulations of three-dimensional Hall MHD turbulence in the presence of a strong mean magnetic field are compared with simulations of the weak compressible RHMHD model. The results show that the degree of agreement is very high (when the different assumptions of RHMHD, such as spectral anisotropy, are satisfied). Nevertheless, when the initial conditions are isotropic but the mean magnetic field is maintained strong, the results differ at the beginning but asymptotically reach a good agreement at relatively short times. We also found evidence that the compressibility still plays a role in the dynamics of these systems, and the weak compressible RHMHD model is able to capture these effects. In conclusion the weak compressible RHMHD model is a valid approximation of the Hall MHD turbulence in the relevant physical context.

Martin, L. N.; Dmitruk, P. [Departamento de Fisica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires (Argentina) and IFIBA, CONICET, Ciudad Universitaria, 1428 Buenos Aires (Argentina); Gomez, D. O. [Departamento de Fisica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires (Argentina) and IFIBA, CONICET, Ciudad Universitaria, 1428 Buenos Aires (Argentina); Instituto de Astronomia y Fisica del Espacio, Ciudad Universitaria, 1428 Buenos Aires (Argentina)

2010-11-15T23:59:59.000Z

72

Bias voltage dependence of the electron spin depolarization in quantum wires in the quantum Hall regime detected by the resistively detected NMR  

SciTech Connect

We performed the resistively-detected nuclear magnetic resonance (RDNMR) to study the electron spin polarization in the non-equilibrium quantum Hall regime. By measuring the Knight shift, we derive source-drain bias voltage dependence of the electron spin polarization in quantum wires. The electron spin polarization shows minimum value around the threshold voltage of the dynamic nuclear polarization.

Chida, K.; Yamauchi, Y.; Arakawa, T.; Kobayashi, K.; Ono, T. [Institute for Chemical Research, Kyoto University, Kyoto (Japan); Hashisaka, M. [Institute for Chemical Research, Kyoto University, Kyoto, Japan and Department of Physics, Tokyo Institute of Technology, Tokyo (Japan); Nakamura, S. [Institute for Chemical Research, Kyoto University, Kyoto, Japan and AIST, Tsukuba (Japan); Machida, T. [IIS and INQIE, University of Tokyo (Japan)

2013-12-04T23:59:59.000Z

73

Fractionalization in Josephson junction arrays hinged by quantum spin Hall edges  

SciTech Connect

We study a superconductor-ferromagnet-superconductor (SC-FM-SC) Josephson array deposited on top of a two-dimensional quantum spin Hall insulator. The Majorana bound state at the interface between SC and FM leads to charge-e tunneling between neighboring superconductor islands, in addition to the usual charge-2e Cooper pair tunneling. Moreover, because Majorana fermions encode the information of charge number parity, an exact Z{sub 2} gauge structure naturally emerges and leads to many new phases, including a deconfined phase where electrons fractionalize into charge-e bosons and topological defects. A deconfined SC-insulator transition has also been found.

Xu Cenke; Fu Liang [Department of Physics, Harvard University, Cambridge, Massachusetts 02138 (United States)

2010-04-01T23:59:59.000Z

74

E-Print Network 3.0 - aps experiment hall Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

Applied Physics Email: kejilai@stanford.edu Summary: ) Si", APS March Meeting, Montreal Canada, March 2004. "Fractional Quantum Hall Effect in SiSi1-x... Gex...

75

Carriers of Electricity in Metals Exhibiting Positive Hall Effects  

Science Journals Connector (OSTI)

The momentum associated with the electric current in metals has been measured for the first time under conditions in which they are known to have positive Hall coefficients. Such metals are of particular interest because their positive (anomalous) coefficients suggest the possibility of positive electric carriers. A coil of the wire under investigation was supported with its axis vertical as a torsional pendulum. The extremely small deflections resulting from the inertial effect of successive reversals of current were measured by a resonance method. A phototube and oscilloscope method for measuring both the amplitude and the phase of the small deflections is described.In more than 100 determinations on Mo and Zn the sign of the charge-to-mass ratio was always found to be negative. For both Mo and Zn the mean value of em was found to be within 3 percent of the value for free electrons in slow motion. One set of determinations for Mo was made at liquid air temperatures. The direct mechanical method used to measure em is independent of any particular theory of metallic conduction. The results thus discriminate against theories for which current and momentum can have the same direction. In particular, the results rule out the possibility that positive Hall effects may be explained by positive carriers.

Sheldon Brown and S. J. Barnett

1952-08-15T23:59:59.000Z

76

THE EFFECT OF SEGMENTED ANODES ON THE PERFORMANCE AND PLUME OF A HALL THRUSTER  

E-Print Network (OSTI)

THE EFFECT OF SEGMENTED ANODES ON THE PERFORMANCE AND PLUME OF A HALL THRUSTER By: ALEXANDER W electrodes in the discharge channel of a Hall thruster to divert discharge current to and from the main anode and thus control the anode temperature. By placing a propellant reservoir in the anode, the evaporation

King, Lyon B.

77

Effect of anode dielectric coating on Hall thruster operation Y. Raitses, and N. J. Fisch  

E-Print Network (OSTI)

Effect of anode dielectric coating on Hall thruster operation L. Dorf,a) Y. Raitses, and N. J phenomenon observed in the near-anode region of a Hall thruster is that the anode fall changes from positive to negative upon removal of the dielectric coating, which is produced on the anode surface during the normal

78

Plasma-Induced Erosion on Ceramic Wall Structures in Hall-Effect Thrusters  

E-Print Network (OSTI)

Plasma-Induced Erosion on Ceramic Wall Structures in Hall-Effect Thrusters Thomas Burton University) hot-pressed composite, denoted as M26, was used as the insulating chamber wall for a xenon plasma Hall expansion of BN in the amorphous silica matrix. Exfoliation accompanied the microcracking in BN and resulted

Walker, Mitchell

79

Effects of Hall and ionslip currents on magnetomicropolar fluid and heat transfer over a nonisothermal stretching sheet with suction and blowing  

Science Journals Connector (OSTI)

...Hall parameter, ion-slip parameter...regime with Hall and ion- slip currents has important engineering applications, e...Effects of Hall and ion-slip currents on...Sherman, A. 1965 Engineering magnetohydrodynamics...

2001-01-01T23:59:59.000Z

80

Plateau structure in the Faraday rotation in the graphene quantum Hall system and the frequency-driven two-parameter scaling  

SciTech Connect

Flow diagram of (?{sub xx},?{sub xy}) in finite-frequency (?) regime is numerically studied for the graphene quantum Hall effect (QHE). In a small-? regime, the ac flow diagram exhibits a behavior qualitatively similar to the dc flow diagram, where the dynamical length scale acts as a cutoff in the ac region, and the flows are between ?{sub xy}?=?(1/2)e{sup 2}/h reflecting the graphene QHE. The dynamical flow is compared with the temperature-driven flow.

Morimoto, Takahiro [Condensed Matter Theory Laboratory, Riken, Saitama, 351-0198 (Japan); Aoki, Hideo [Department of Physics, University of Tokyo, Hongo, Tokyo 113-0033 (Japan)

2013-12-04T23:59:59.000Z

Note: This page contains sample records for the topic "quantum hall effect" 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

Linear instability of magnetic Taylor-Couette flow with Hall effect Gunther Rudiger*  

E-Print Network (OSTI)

in a rather complex bifurcation diagram. In this case the critical magnetic Reynolds numbers with Hall effect MHD regime the Rayleigh criterion for stability, Eq. 4 , changes to ^ 1 5 for a weak magnetic field

82

Genomic instability and bystander effects induced by high-LET radiation Eric J Hall*,1  

E-Print Network (OSTI)

Genomic instability and bystander effects induced by high-LET radiation Eric J Hall*,1 and Tom K. There is a progressive increase in genomic instability, determined either by gene amplification or allelic imbalance

83

Imaging of quantum Hall edge states under quasiresonant excitation by a near-field scanning optical microscope  

SciTech Connect

A high resolution mapping of quantum Hall edge states has been performed by locally creating electrons with small excess energies with a near-field scanning optical microscope in a dilution refrigerator. We have observed fine structures parallel to the edge in photovoltage signals, which appear only at low temperature. The observed fine structures near sample edges have been seen to shift inward with increase in magnetic field in accordance with Chklovskii Shklovskii, and Glazman model.

Ito, H.; Shibata, Y.; Mamyoda, S.; Ootuka, Y.; Nomura, S. [Division of Physics, University of Tsukuba, Tennodai, Tsukuba, 305-8571 (Japan); Kashiwaya, S. [National Institute of Advanced Industrial Science and Technology (AIST), Umezono, Tsukuba, 305-8568 (Japan); Yamaguchi, M.; Akazaki, T.; Tamura, H. [NTT Basic Research Laboratories, NTT Corporation, Morinosato-Wakamiya, Atsugi, 243-0198 (Japan)

2013-12-04T23:59:59.000Z

84

Hall Effect, Resistivity, and Magnetoresistivity of Th, U, Zr, Ti, and Nb  

Science Journals Connector (OSTI)

The Hall effect, resistivity, and magnetoresistivity of Th, U, Zr, Ti, and Nb have been studied at temperatures between ?1K and room temperature and in magnetic fields up to 30 kilogauss. Strong temperature and purity dependences were observed in the Hall coefficients of U, Ti, and Zr. In addition, the Hall coefficient of Zr was strongly dependent upon magnetic field strength at liquid helium temperatures. Comparisons with theory have been carried out, and it is concluded that existing theories are not sufficiently general to account quantitatively for the observed temperature and magnetic field dependences of the Hall effect and resistivity. Unusual behavior was observed in the magnetic-field-induced superconducting transition of Nb.

Ted G. Berlincourt

1959-05-15T23:59:59.000Z

85

488 Brazilian Journal of Physics, vol. 36, no. 2A, June, 2006 Spin Valve Effect and Hall Resistance in a Wide Parabolic Well  

E-Print Network (OSTI)

488 Brazilian Journal of Physics, vol. 36, no. 2A, June, 2006 Spin Valve Effect and Hall Resistance: Spin valve; Hall resistance; AlcGa1-cAs parabolic wells I. INTRODUCTION The Hall effect is very known by the formula Rxy = R0B+RSM, where B is ap- plied magnetic field, R0 is the ordinary Hall coefficient, and RS

Gusev, Guennady

86

JORDAN HALL HEDRICK HALL  

E-Print Network (OSTI)

BARTON LAB JORDAN HALL 1 4 35 5 6 HEDRICK HALL FOOD RESEARCH LAB 34 North Street Pre 43 6893 6541 56 55 39 74A 14 10 54 36 13 12 A 11 78 C 60C Pavillion 1 Jordan Hall 4 Hedrick Hall 5

Pawlowski, Wojtek

87

-MODEL No: HMS5300-* Product Name : Hall Effect Measurement  

E-Print Network (OSTI)

-IT55T3) 2-3) How to input the gas valve 3) Bolt screw in and out , to lock in and lock out magnet 4) LN, resistivity, conductivity, hall coefficient 4) Test in Low temperature by using Liquid Nitrogen (1) Pour ~ Gas In 8'CDheater ®motor r .. ~ Pic#4 AHT55T3 rear view > 5 #12;2-3) How to input the gas valve Insert

Woodall, Jerry M.

88

The Effect of Magnetic Field on the Performance of Low-Power Cylindrical Hall Thrusters  

E-Print Network (OSTI)

electron flow is generated by the divergent magnetic field lines. (a) (b) Fig. 1. (a) SchematicThe Effect of Magnetic Field on the Performance of Low-Power Cylindrical Hall Thrusters IEPC-2005 for scaling down. The effect of the magnetic field on the discharge characteristics and efficiency of the low

89

Low-temperature Hall effect in substituted Sr2RuO4  

Science Journals Connector (OSTI)

We report the results of a study of the Hall effect and magnetoresistance in single crystals of Sr2RuO4 in which Sr2+ has been substituted by La3+ (Sr2?yLayRuO4) or Ru4+ by Ti4+ (Sr2Ru1?xTixO4). For undoped Sr2RuO4, the purity is so high that the strong-field Hall coefficient can be measured for fields above 4T. The conventional weak-field Hall coefficient as a function of doping shows a sharp jump and sign change at y?0.01 that is unrelated to either a sharp change in Fermi-surface topography or a magnetic instability. The implications of these results are discussed.

Naoki Kikugawa; Andrew Peter Mackenzie; Christoph Bergemann; Yoshiteru Maeno

2004-11-03T23:59:59.000Z

90

Properties of Hall magnetohydrodynamic waves modified by electron inertia and finite Larmor radius effects  

Science Journals Connector (OSTI)

The linear wave equation (sixth order in space and time) and the corresponding dispersion relation is derived for Hall magnetohydrodynamic(MHD)waves including electron inertial and finite Larmor radius effects together with several limiting cases for a homogeneous plasma. We contrast these limits with the solution of the full dispersion relation in terms of wave normal ( k ? k ? ) diagrams to clearly illustrate the range of applicability of the individual approximations. We analyze the solutions in terms of all three MHD wave modes (fast slow and Alfvn) with particular attention given to how the Alfvn branch (including the cold ideal field line resonance (FLR) [D. J. Southwood Planet. Space Sci.22 483 (1974)]) is modified by the Hall term and electron inertial and finite Larmor radius effects. The inclusion of these terms breaks the degeneracy of the Alfvn branch in the cold plasma limit and displaces the asymptote position for the FLR to a line defined by the electron thermal speed rather than the Alfvn speed. For a driven system the break in this degeneracy implies that a resonance would form at one field line for small k ? and then shift to another as k ? ? ? . However for very large ? k ? / V A Hall term effects lead to a coupling to the whistler mode which would then transport energy away from the resonant layer. The inclusion of the Hall term also significantly effects the characteristics of the slow mode. This analysis reveals an interesting swapping of the perpendicular root behavior between the slow and Alfvn branches.

P. A. Damiano; A. N. Wright; J. F. McKenzie

2009-01-01T23:59:59.000Z

91

Effects of segmented electrode in Hall current plasma thrusters Y. Raitsesa)  

E-Print Network (OSTI)

Effects of segmented electrode in Hall current plasma thrusters Y. Raitsesa) Princeton University Plasma Physics Laboratory, P. O. Box 451, Princeton, New Jersey 08543 M. Keidar Aerospace Engineering, University of Michigan, Ann Arbor, Michigan 48109 D. Staack and N. J. Fisch Princeton University Plasma

92

Effective equations for the quantum pendulum from momentous quantum mechanics  

SciTech Connect

In this work we study the quantum pendulum within the framework of momentous quantum mechanics. This description replaces the Schroedinger equation for the quantum evolution of the system with an infinite set of classical equations for expectation values of configuration variables, and quantum dispersions. We solve numerically the effective equations up to the second order, and describe its evolution.

Hernandez, Hector H.; Chacon-Acosta, Guillermo [Universidad Autonoma de Chihuahua, Facultad de Ingenieria, Nuevo Campus Universitario, Chihuahua 31125 (Mexico); Departamento de Matematicas Aplicadas y Sistemas, Universidad Autonoma Metropolitana-Cuajimalpa, Artificios 40, Mexico D. F. 01120 (Mexico)

2012-08-24T23:59:59.000Z

93

Local backscattering in the quantum Hall regime S. Kicin, A. Pioda, T. Ihn,* and K. Ensslin  

E-Print Network (OSTI)

images exhibit local features that show a 1/B-periodicity. These features line up along the Hall bar,7 The existence of extended states with a transmission of one between neighboring sample contacts is the basis channels.26,27 In this paper we follow the route of applying scanning probe techniques to a 2DEG in the QHE

Ihn, Thomas

94

Determination of the Pt spin diffusion length by spin-pumping and spin Hall effect  

SciTech Connect

The spin diffusion length of Pt at room temperature and at 8 K is experimentally determined via spin pumping and spin Hall effect in permalloy/Pt bilayers. Voltages generated during excitation of ferromagnetic resonance from the inverse spin Hall effect and anisotropic magnetoresistance effect were investigated with a broadband approach. Varying the Pt layer thickness gives rise to an evolution of the voltage line shape due to the superposition of the above two effects. By studying the ratio of the two voltage components with the Pt layer thickness, the spin diffusion length of Pt can be directly extracted. We obtain a spin diffusion length of ?1.2 nm at room temperature and ?1.6 nm at 8 K.

Zhang, Wei; Pearson, John E.; Hoffmann, Axel [Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)] [Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States); Vlaminck, Vincent [Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States) [Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States); Colegio de Ciencias e Ingenera, Universidad San Fransciso de Quito, Quito (Ecuador); Divan, Ralu [Center for Nanoscale Materials, Argonne National Laboratory, Illinois 60439 (United States)] [Center for Nanoscale Materials, Argonne National Laboratory, Illinois 60439 (United States); Bader, Samuel D. [Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States) [Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States); Center for Nanoscale Materials, Argonne National Laboratory, Illinois 60439 (United States)

2013-12-09T23:59:59.000Z

95

Quasiholes of 13 and 73 quantum Hall states: Size estimates via exact diagonalization and density-matrix renormalization group  

Science Journals Connector (OSTI)

We determine the size of the elementary quasihole in ?=1/3 and ?=7/3 quantum Hall states via exact-diagonalization and density-matrix renormalization group calculations on the sphere and cylinder, using a variety of short- and long-range pinning potentials. The size of the quasihole at filling factor ?=1/3 is estimated to be ?4?B, and that of ?=7/3 is ?7?B, where ?B is the magnetic length. In contrast, the size of the Laughlin quasihole, expected to capture the basic physics in these two states, is around ?2.5?B. Our work supports the earlier findings that the quasihole in the first excited Landau level is significantly larger than in the lowest Landau level.

Sonika Johri; Z. Papi?; R. N. Bhatt; P. Schmitteckert

2014-03-24T23:59:59.000Z

96

Spin Hall effect in spin-valley coupled monolayers of transition metal dichalcogenides  

SciTech Connect

We study both the intrinsic and extrinsic spin Hall effect in spin-valley coupled monolayers of transition metal dichalcogenides. We find that whereas the skew-scattering contribution is suppressed by the large band gap, the side-jump contribution is comparable to the intrinsic one with opposite sign in the presence of scalar andmagnetic scattering. Intervalley scattering tends to suppress the side-jump contribution due to the loss of coherence. By tuning the ratio of intra- to intervalley scattering, the spin Hall conductivity shows a sign change in hole-doped samples. The multiband effect in other doping regimes is considered, and it is found that the sign change exists in the heavily hole-doped regime, but not in the electron-doped regime.

Shan, Wen-Yu [Carnegie Mellon University (CMU); Lu, Hai-Zhou [University of Hong Kong, The; Xiao, Di [Carnegie Mellon University (CMU)

2013-01-01T23:59:59.000Z

97

Effect of magnetic field profile on the anode fall in a Hall-effect thruster dischargea...  

E-Print Network (OSTI)

in the plasma, and not in the non-neutral sheath near the cathode like in regular glow and arc discharges. Thus of the magnetic field configuration on the anode fall in an E B discharge of a Hall thruster is studied both of Hall thrusters is based on electro- static acceleration of heavy ions in crossed electric and mag

98

Electric Field effects on quantum correlations in semiconductor quantum dots  

E-Print Network (OSTI)

We study the effect of external electric bias on the quantum correlations in the array of optically excited coupled semiconductor quantum dots. The correlations are characterized by the quantum discord and concurrence and are observed using excitonic qubits. We employ the lower bound of concurrence for thermal density matrix at different temperatures. The effect of the F\\"orster interaction on correlations will be studied. Our theoretical model detects nonvanishing quantum discord when the electric field is on while concurrence dies, ensuring the existence of nonclassical correlations as measured by the quantum discord.

S. Shojaei; M. Mahdian; R. Yousefjani

2012-05-01T23:59:59.000Z

99

Mobility of Negative Ions in Flames by the Hall Effect Method  

Science Journals Connector (OSTI)

Variation with potential gradient of mobility of negative flame ions.Using a flat salted flame, previously described by Wilson, between the poles of an electromagnet giving a field of 5000 gauss, the horizontal potential gradient X due to the current sent between two Pt electrodes and also the vertical potential gradient Y due to the Hall effect, were measured by means of two Pt sounding wires which could be rotated about a horizontal axis and which were connected to a quadrant electrometer. For a flame containing potassium carbonate the mobility k2=YHX was found to decrease from 26 m/sec for 1 volt/cm when the potential gradient was 1 volt/cm, to 16 m/sec for a gradient of 30 volts/cm. For a flame free from salt the mobility was some-what greater, decreasing from 26.5 m/sec for 5 volts/cm to 16 m/sec for 50 volts/cm. However, wide variation of concentration produced so little effect on the mobility that it could not be detected with certainty. The magneto-resistance effect which Heaps1 has shown enters into the mobility equation, was so small as to be negligible.Asymmetry of the Hall effect in flames.The Hall effect was found to vary slightly with the direction of the magnetic field, the asymmetry being greater the greater the amount of salt in the flame. This asymmetry was probably due to the effect of the magnetic field on the upward velocity of the flame gases, which was evident in these experiments.

J. S. Watt

1925-01-01T23:59:59.000Z

100

Inverse spin Hall effect induced by spin pumping into semiconducting ZnO  

SciTech Connect

The inverse spin Hall effect (ISHE) of n-type semiconductor ZnO thin films with weak spin-orbit coupling has been observed by utilizing the spin pumping method. In the ferromagnetic resonance condition, the spin pumping driven by the dynamical exchange interaction of a permalloy film injects a pure spin current into the adjacent ZnO layer. This spin current gives rise to a DC voltage through the ISHE in the ZnO layer, and the DC voltage is proportional to the microwave excitation power. The effect is sizeable even when the spin backflow is considered.

Lee, Jung-Chuan [Institute of Physics, Academia Sinica, Taipei 11529, Taiwan (China); Huang, Leng-Wei [Graduate Institute of Applied Physics, National Chengchi University, Taipei 11605, Taiwan (China); Hung, Dung-Shing, E-mail: dshung@mail.mcu.edu.tw [Institute of Physics, Academia Sinica, Taipei 11529, Taiwan (China); Department of Information and Telecommunications Engineering, Ming Chuan University, Taipei 111, Taiwan (China); Chiang, Tung-Han [Department of Physics, National Cheng Kung University, Tainan 70101, Taiwan (China); Huang, J. C. A., E-mail: jcahuang@mail.ncku.edu.tw [Department of Physics, National Cheng Kung University, Tainan 70101, Taiwan (China); Advanced Optoelectronic Technology Center, National Cheng Kung University, Tainan 70101, Taiwan (China); Liang, Jun-Zhi [Advanced Optoelectronic Technology Center, National Cheng Kung University, Tainan 70101, Taiwan (China); Department of Physics, Fu Jen Catholic University, Taipei 242, Taiwan (China); Lee, Shang-Fan, E-mail: leesf@phys.sinica.edu.tw [Institute of Physics, Academia Sinica, Taipei 11529, Taiwan (China); Graduate Institute of Applied Physics, National Chengchi University, Taipei 11605, Taiwan (China)

2014-02-03T23:59:59.000Z

Note: This page contains sample records for the topic "quantum hall effect" 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

Gregory Hall  

NLE Websites -- All DOE Office Websites (Extended Search)

Gregory Hall Gregory Hall Senior Chemist Chemistry Department Building 555 Brookhaven National Laboratory P.O. Box 5000 Upton, NY 11973-5000 Phone: (631) 344-4376 FAX: (631) 344-5815 e-mail Gas-Phase Molecular Dynamics Research Interests Chemical Physics: Molecular dynamics, spectroscopy, photochemistry and kinetics. Applications of high resolution spectroscopy to molecular dynamics; Doppler spectroscopy for the measurement of product correlations in bimolecular and unimolecular reactions. Statistical and dynamical models of vector correlations; experimental tests of unimolecular rate theory. Multiple surface reactions; coherent effects in multiple path reactions; measurement and interpretation of photofragment orientation. Collision-induced electronic transitions. Double-resonance spectroscopy for collision studies of energy and polarization transfer.

102

Quantum mechanical effects from deformation theory  

SciTech Connect

We consider deformations of quantum mechanical operators by using the novel construction tool of warped convolutions. The deformation enables us to obtain several quantum mechanical effects where electromagnetic and gravitomagnetic fields play a role. Furthermore, a quantum plane can be defined by using the deformation techniques. This in turn gives an experimentally verifiable effect.

Much, A. [Max-Planck-Institute for Mathematics in the Sciences, 04103 Leipzig, Germany and Institute for Theoretical Physics, University of Leipzig, 04009 Leipzig (Germany)] [Max-Planck-Institute for Mathematics in the Sciences, 04103 Leipzig, Germany and Institute for Theoretical Physics, University of Leipzig, 04009 Leipzig (Germany)

2014-02-15T23:59:59.000Z

103

Nuclear quantum effects in water  

E-Print Network (OSTI)

In this work, a path integral Car-Parrinello molecular dynamics simulation of liquid water is performed. It is found that the inclusion of nuclear quantum effects systematically improves the agreement of first principles simulations of liquid water with experiment. In addition, the proton momentum distribution is computed utilizing a recently developed open path integral molecular dynamics methodology. It is shown that these results are in good agreement with neutron Compton scattering data for liquid water and ice.

Joseph A. Morrone; Roberto Car

2008-03-25T23:59:59.000Z

104

Superluminal neutrino: a quantum weak measurement effect?  

E-Print Network (OSTI)

Superluminal neutrino: a quantum weak measurement effect? Pragya Shukla · Dynamical laws, both in quantum and classical theory, are ?me-symmetric. · Measurements, the result of a measurement performed at a later ?me t1 or previous ?me

105

Quantitative Study Of Guide Field Effects on Hall Reconnection In A Laboratory Plasma  

SciTech Connect

The effect of guide field on magnetic reconnection is quantitatively studied by systematically varying an applied guide field in the Magnetic Reconnection Experiment (MRX). The quadrupole field, a signature of two-fluid reconnection at zero guide field, is significantly altered by a finite guide field. It is shown that the reconnection rate is significantly reduced with increasing guide field, and this dependence is explained by a combination of local and global physics: locally, the in-plane Hall currents are reduced, while globally guide field compression produces an increased pressure both within and downstream of the reconnection region. __________________________________________________

T. D. Tharp, M. Yamada, H. Ji, E. Lawrence, S. Dorfman, C. Myers, and J. Yoo

2012-04-17T23:59:59.000Z

106

Jack polynomials as fractional quantum Hall states and the Betti numbers of the (k+1)-equals ideal  

E-Print Network (OSTI)

We show that for Jack parameter \\alpha = -(k+1)/(r-1), certain Jack polynomials studied by Feigin-Jimbo-Miwa-Mukhin vanish to order r when k+1 of the coordinates coincide. This result was conjectured by Bernevig and Haldane, who proposed that these Jack polynomials are model wavefunctions for fractional quantum Hall states. Special cases of these Jack polynomials include the wavefunctions of Laughlin and Read-Rezayi. In fact, along these lines we prove several vanishing theorems known as clustering properties for Jack polynomials in the mathematical physics literature, special cases of which had previously been conjectured by Bernevig and Haldane. Motivated by the method of proof, which in case r = 2 identifies the span of the relevant Jack polynomials with the S_n-invariant part of a unitary representation of the rational Cherednik algebra, we conjecture that unitary representations of the type A Cherednik algebra have graded minimal free resolutions of Bernstein-Gelfand-Gelfand type; we prove this for the ideal of the (k+1)-equals arrangement in the case when the number of coordinates n is at most 2k+1. In general, our conjecture predicts the graded S_n-equivariant Betti numbers of the ideal of the (k+1)-equals arrangement with no restriction on the number of ambient dimensions.

Christine Berkesch Zamaere; Stephen Griffeth; Steven V Sam

2013-03-18T23:59:59.000Z

107

Barton Hall Bartels Hall  

E-Print Network (OSTI)

Phi Epsilon Delta Kappa Epsilon Johnson Museum of Art Ward Center for Nuclear Sciences Big Red Barn Kite Hill Substation Friends Hall House 5 Eddy Gate Traffic Booth Kroch Library Traffic Booth Theta GARDENAVENUE SOUTH AVENUE EDGEMOOR LANE EASTAVENUE STATLERDRIVE ROAD CASCADILLA MARYANN WOOD DR COLLEGEAVENUE

Danforth, Bryan Nicholas

108

Ambipolar Molybdenum Diselenide Field-Effect Transistors: Field-Effect and Hall Mobilities  

Science Journals Connector (OSTI)

National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States ... The thickness of the MoSe2 crystal was measured by scanning the AFM tip along the blue line. ... Red lines are linear fits from whose slope we extract the Hall constant RH = 1/ne where n is the number of carriers. ...

Nihar R. Pradhan; Daniel Rhodes; Yan Xin; Shahriar Memaran; Lakshmi Bhaskaran; Muhandis Siddiq; Stephen Hill; Pulickel M. Ajayan; Luis Balicas

2014-07-09T23:59:59.000Z

109

Electron-electron interaction effect on the conductivity and the Hall conductivity of weakly disordered electron systems  

Science Journals Connector (OSTI)

The effect of the electron-electron Coulomb interaction on the conductivity and Hall conductivity of weakly disordered (T?>1, where ? is the electron mean free path) three- and two-dimensional electron systems is studied. We find that (i) temperature-dependent interaction corrections to the impurity resistivity and the Hall coefficient are positive in three and two dimensions; (ii) in two dimensions, gapless plasmons and particle-hole excitations both contribute to the electron-electron-impurity interference correction, to the resistivity; and (iii) in two-dimensional electron systems such as GaAs heterojunctions, the electron-electron interaction gives the leading temperature-dependent correction to the impurity conductivity and the Hall conductivity more important than the corresponding corrections from the piezoelectric electron-phonon interaction.

Michael Reizer

1998-05-15T23:59:59.000Z

110

Quantum Field Theory in Graphene  

E-Print Network (OSTI)

This is a short non-technical introduction to applications of the Quantum Field Theory methods to graphene. We derive the Dirac model from the tight binding model and describe calculations of the polarization operator (conductivity). Later on, we use this quantity to describe the Quantum Hall Effect, light absorption by graphene, the Faraday effect, and the Casimir interaction.

I. V. Fialkovsky; D. V. Vassilevich

2011-11-13T23:59:59.000Z

111

PIC simulation of SPT Hall thrusters : high power operation and wall effects  

E-Print Network (OSTI)

The fully kinetic Hall Thruster simulation built by [1] and used by [2] is further refined and used to obtain results for the P5 SPT Hall thruster at 3kw and 5kw operation. Performance data agree well with experiments [3], ...

Sullivan, Kay Ueda, 1980-

2004-01-01T23:59:59.000Z

112

Thermal instability in molecular clouds, including dust particles, Hall effect and ambipolar diffusion  

Science Journals Connector (OSTI)

......not significantly affect the diagram. By increasing to higher values, the diagram tends to isentropic mode. Therefore...and Hall diffusion to ideal MHD equations. We have also considered...instability. First, we considered MHD equations for partially ionized......

A. R. Khesali; S. M. Ghoreyshi; M. Nejad-Asghar

2012-03-01T23:59:59.000Z

113

Quantum Spin Hall Phases  

Science Journals Connector (OSTI)

......even it is called the weak topological in- sulator (WTI). The STI and WTI correspond to the QSH and I phases, respectively...are used to distinguish various phases in the STI or WTI phases, and each phase can be associated with a mod......

Shuichi Murakami

2008-06-01T23:59:59.000Z

114

Direct measurement of the Hall effect in a free-electron-like surface state Toru Hirahara, Iwao Matsuda,* Canhua Liu, Rei Hobara, Shinya Yoshimoto, and Shuji Hasegawa  

E-Print Network (OSTI)

a number of reports on the Hall effect and magnetoresistance at metal or metal silicide ultrathin films- or alkali-metal atoms on the surface, the electron pocket becomes larger because electrons are doped

Hasegawa, Shuji

115

Optimal tunneling enhances the quantum photovoltaic effect in double quantum dots  

E-Print Network (OSTI)

We investigate the quantum photovoltaic effect in double quantum dots by applying the nonequilibrium quantum master equation. A drastic suppression of the photovoltaic current is observed near the open circuit voltage, ...

Wang, Chen

116

Hall effect in La0.7Ce0.3MnO3+? films with variable oxygen content  

Science Journals Connector (OSTI)

Hall effects of the La0.7Ce0.3MnO3+? film, which is believed an electron-doped manganite, have been experimentally studied, and a positive normal Hall coefficient is observed below the Curie temperature when the oxygen content of the film varies in a wide range. These observations may be attributed to the presence of excessive oxygen and composition distribution in the film, which may occur companying tetravalent ion doping. Removing excessive oxygen drives the system into the electron-doping state, however, the resistivity increases monotonically with oxygen loss, and the metal-to-semiconductor transition typical for a hole-doped manganite disappears. These results suggest the determinative role of hole doping for the resistive and magnetic behaviors in La0.7Ce0.3MnO3+?.

D. J. Wang; J. R. Sun; S. Y. Zhang; G. J. Liu; B. G. Shen; H. F. Tian; J. Q. Li

2006-04-04T23:59:59.000Z

117

Hall effect in the marginal Fermi liquid regime of high-Tc superconductors  

Science Journals Connector (OSTI)

The detailed derivation of a theory for transport in quasi-two-dimensional metals, with small-angle elastic scattering and angle-independent inelastic scattering is presented. The transport equation is solved for a model Fermi surface representing a typical cuprate superconductor. Using the small-angle elastic and the inelastic scattering rates deduced from angle-resolved photoemission experiments, good quantitative agreement with the observed anomalous temperature dependence of the Hall angle in optimally doped cuprates is obtained, while the resistivity remains linear in temperature. The theory is also extended to the frequency-dependent complex Hall angle.

Elihu Abrahams and C. M. Varma

2003-09-04T23:59:59.000Z

118

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

119

Properties of Hall magnetohydrodynamic waves modified by electron inertia and finite Larmor radius effects  

E-Print Network (OSTI)

dispersion relation is derived for Hall magnetohydrodynamic MHD waves including electron inertial and finite these limits with the solution of the full dispersion relation in terms of wave normal k ,k diagrams to clearly of all three MHD wave modes fast, slow, and Alfvén , with particular attention given to how the Alfvén

Wright, Andrew N.

120

Conductivity and Hall effect in the two-dimensional Hubbard model  

Science Journals Connector (OSTI)

A path-integral field-theoretic derivation of electromagnetic linear response for the two-dimensional Hubbard model is given. We find, remarkably, that changes in the Fermi-surface topology associated with incommensurate planar spin-density-wave saddle points induce a change in sign of the Hall coefficient at dopings ?H=0.020.5 for U/t=210. The change in sign is not affected by short-range magnetic domains. We delinate from first principles an anomalous temperature dependence of the Hall carrier density at dopings close to ?H. An additional anisotropic component to the usual dc conductivity is nonvanishing for certain types of spirals. The paper extends the Bloch-Boltzmann theory to the case of untraditional Fermi liquids where the damping of the quasiparticles is ?(?)?max(kBT,?).

Puru Voruganti; Andrey Golubentsev; Sajeev John

1992-06-15T23:59:59.000Z

Note: This page contains sample records for the topic "quantum hall effect" 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

Oscillatory Hall Effect, Magnetoresistance, and Magnetic Susceptibility of a Graphite Single Crystal  

Science Journals Connector (OSTI)

The Hall coefficient, magnetoresistance, and magnetic susceptibility of a graphite single crystal have been measured at liquid helium temperatures and in magnetic fields up to 25 kilogauss. All three phenomena are periodic functions of reciprocal field and exhibit the same period for like orientations of the crystal axes with respect to the magnetic field. The phases however are different. Where possible, experiment and theory have been compared.

Ted G. Berlincourt and M. C. Steele

1955-05-15T23:59:59.000Z

122

Hall-effect Controlled Gas Dynamics in Protoplanetary Disks: II. Full 3D Simulations toward the Outer Disk  

E-Print Network (OSTI)

We perform 3D stratified shearing-box MHD simulations on the gas dynamics of protoplanetary disks threaded by net vertical magnetic field Bz. All three non-ideal MHD effects, Ohmic resistivity, the Hall effect and ambipolar diffusion are included in a self-consistent manner based on equilibrium chemistry. We focus on regions toward outer disk radii, from 5-60AU, where Ohmic resistivity tends to become negligible, ambipolar diffusion dominates over an extended region across disk height, and the Hall effect largely controls the dynamics near the disk midplane. We find that around R=5AU, the system launches a laminar/weakly turbulent magnetocentrifugal wind when the net vertical field Bz is not too weak, as expected. Moreover, the wind is able to achieve and maintain a configuration with reflection symmetry at disk midplane. The case with anti-aligned field polarity (Omega. Bz<0) is more susceptible to the MRI when Bz drops, leading to an outflow oscillating in radial directions and very inefficient angular m...

Bai, Xue-Ning

2014-01-01T23:59:59.000Z

123

Quantum nuclear effects on surfaces and dispersion bonded systems  

E-Print Network (OSTI)

Quantum nuclear effects on surfaces and dispersion bonded systems Erlend Davidson A dissertation all system types. In particular long range van der Waals dispersion forces and quantum nuclear effects of the art methods to include van der Waals dispersion and quantum nuclear effects on a range of well defined

Guillas, Serge

124

Quantum Mechanical Effects in Gravitational Collapse  

E-Print Network (OSTI)

In this thesis we investigate quantum mechanical effects to various aspects of gravitational collapse. These quantum mechanical effects are implemented in the context of the Functional Schr\\"odinger formalism. The Functional Schr\\"odinger formalism allows us to investigate the time-dependent evolutions of the quantum mechanical effects, which is beyond the scope of the usual methods used to investigate the quantum mechanical corrections of gravitational collapse. Utilizing the time-dependent nature of the Functional Schr\\"odinger formalism, we study the quantization of a spherically symmetric domain wall from the view point of an asymptotic and infalling observer, in the absence of radiation. To build a more realistic picture, we then study the time-dependent nature of the induced radiation during the collapse using a semi-classical approach. Using the domain wall and the induced radiation, we then study the time-dependent evolution of the entropy of the domain wall. Finally we make some remarks about the possible inclusion of backreaction into the system.

Eric Greenwood

2010-01-12T23:59:59.000Z

125

Evolution of the Spin Hall Effect in Pt Nanowires: Size and Temperature Effects Laurent Vila,1  

E-Print Network (OSTI)

. This is the direct SHE (DSHE) where unpo- larized charge currents are converted into pure spin cur- rents with zero net charge flow. There is also the inverse effect called inverse SHE (ISHE) where pure spin currents theoretical analysis based on the first-principles band calculation strongly suggests that the origin

Otani, Yoshichika

126

Quantum gravity effects in the Kerr spacetime  

SciTech Connect

We analyze the impact of the leading quantum gravity effects on the properties of black holes with nonzero angular momentum by performing a suitable renormalization group improvement of the classical Kerr metric within quantum Einstein gravity. In particular, we explore the structure of the horizons, the ergosphere, and the static limit surfaces as well as the phase space available for the Penrose process. The positivity properties of the effective vacuum energy-momentum tensor are also discussed and the 'dressing' of the black hole's mass and angular momentum are investigated by computing the corresponding Komar integrals. The pertinent Smarr formula turns out to retain its classical form. As for their thermodynamical properties, a modified first law of black-hole thermodynamics is found to be satisfied by the improved black holes (to second order in the angular momentum); the corresponding Bekenstein-Hawking temperature is not proportional to the surface gravity.

Reuter, M. [Institute of Physics, University of Mainz, Staudingerweg 7, D-55099 Mainz (Germany); Tuiran, E. [Departamento de Fisica, Universidad del Norte, Km 5 via a Puerto Colombia, AA-1569 Barranquilla (Colombia)

2011-02-15T23:59:59.000Z

127

Quantum confined Stark effect in Gaussian quantum wells: A tight-binding study  

SciTech Connect

The main characteristics of the quantum confined Stark effect (QCSE) are studied theoretically in quantum wells of Gaussian profile. The semi-empirical tight-binding model and the Green function formalism are applied in the numerical calculations. A comparison of the QCSE in quantum wells with different kinds of confining potential is presented.

Ramrez-Morales, A.; Martnez-Orozco, J. C.; Rodrguez-Vargas, I. [Unidad Acadmica de Fsica, Universidad Autnoma de Zacatecas, Calzada Solidaridad Esquina Con Paseo La Bufa S/N, 98060 Zacatecas, Zac. (Mexico)

2014-05-15T23:59:59.000Z

128

Quantum resistance standard accuracy close to the zero-dissipation state  

SciTech Connect

We report on a comparison of four GaAs/AlGaAs-based quantum resistance standards using an original technique adapted from the well-known Wheatstone bridge. This work shows that the quantized Hall resistance at Landau level filling factor ?=2 can be reproducible with a relative uncertainty of 3210{sup ?12} in the dissipationless limit of the quantum Hall effect regime. In the presence of a very small dissipation characterized by a mean macroscopic longitudinal resistivity R{sub xx}(B) of a few ??, the discrepancy ?R{sub H}(B) between quantum Hall resistors measured on the Hall plateau at magnetic induction B turns out to follow the so-called resistivity rule R{sub xx}(B)=?Bd(?R{sub H}(B))/dB. While the dissipation increases with the measurement current value, the coefficient ? stays constant in the range investigated (40?120 ?A). This result enlightens the impact of the dissipation emergence in the two-dimensional electron gas on the Hall resistance quantization, which is of major interest for the resistance metrology. The quantum Hall effect is used to realize a universal resistance standard only linked to the electron charge e and the Planck constant h and it is known to play a central role in the upcoming revised Systme International of units. There are therefore fundamental and practical benefits in testing the reproducibility property of the quantum Hall effect with better and better accuracy.

Schopfer, F.; Poirier, W. [Laboratoire National de mtrologie et d'Essais (LNE), 29 avenue Roger Hennequin, 78197 Trappes (France)] [Laboratoire National de mtrologie et d'Essais (LNE), 29 avenue Roger Hennequin, 78197 Trappes (France)

2013-08-14T23:59:59.000Z

129

Kroon Hall  

New Haven, CT Kroon Hall, the new home for the Yale School of Forestry and Environmental Studies, is charged with many ambitious goals: to be novel and inspiring while fitting in with its Neo-Gothic neighbors; to be timeless on a campus known for its icons; to be practical, indeed, the university's most efficient energy consumer; to provide a home for an academic department previously scattered throughout a collection of outdated buildings; to not only be sustainable but to explicitly reveal through its design how a 100-year design lifespan building can run on nearly 60% fewer resources than its conventiona

130

Memory Effects in Quantum Channel Discrimination Giulio Chiribella,1  

E-Print Network (OSTI)

Memory Effects in Quantum Channel Discrimination Giulio Chiribella,1 Giacomo M. D'Ariano,1 quantum-memory assisted protocols for discriminating quantum channels. We show that for optimal discrimination of memory channels, memory assisted protocols are needed. This leads to a new notion of distance

D'Ariano, Giacomo Mauro

131

E-Print Network 3.0 - annular hall thrusters Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

Collection: Plasma Physics and Fusion 48 Discharge Oscillations in a Permanent Magnet Cylindrical Hall-Effect Thruster Summary: in for annular Hall thrusters. A transition...

132

Unruh effect, quantum thermometer and geometric phase  

E-Print Network (OSTI)

We analyze the properties of the geometric phase of a two level atom system in the case in which the atoms are accelerated by an external potential and in the case in which they interact with a thermal state. Non-trivial values of the geometric phases are obtained. We then propose the realization of an interferometer in which the analysis of Mukunda-Simon phase can demonstrate the existence of the Unruh effect. The realization of a very precise quantum thermometer is also discussed.

A. Capolupo; G. Vitiello

2015-02-02T23:59:59.000Z

133

Hall effect and resistivity in high-Tc superconductors: The conserving approximation  

Science Journals Connector (OSTI)

The Hall coefficient RH in high-Tc cuprates in the normal state shows the striking non-Fermi-liquid behavior: RH follows a Curie-Weiss type temperature dependence and |RH|?1/|ne| at low temperatures in the underdoped compounds. Moreover, RH is positive for hole-doped compounds and negative for electron-doped ones, although each of them has a similar holelike Fermi surface. In this paper, we give the explanation of this long-standing problem from the standpoint of the nearly antiferromagnetic (AF) Fermi liquid. We consider seriously the vertex corrections for the current which are indispensable to satisfy the conservation laws, which are violated within the conventional Boltzmann transport approximation. The obtained total current Jk takes an enhanced value and is no longer perpendicular to the Fermi surface due to the strong AF fluctuations. By virtue of this mechanism, the anomalous behaviors of RH in high-Tc cuprates are naturally explained. Both the temperature and the (electron, hole) doping dependences of RH in high-Tc cuprates are reproduced well by numerical calculations based on the fluctuation-exchange approximation, applied to the single-band Hubbard model with a holelike Fermi surface. We also discuss the singular temperature dependence of RH in other nearly AF metals, e.g., V2O3, ?-BEDT-TTF organic superconductors, and heavy fermion systems close to the AF phase boundary.

Hiroshi Kontani; Kazuki Kanki; Kazuo Ueda

1999-06-01T23:59:59.000Z

134

Quantum Coherence Effects in Novel Quantum Optical Systems  

E-Print Network (OSTI)

Optical response of an active medium can substantially be modified when coherent superpositions of states are excited, that is, when systems display quantum coherence and interference. This has led to fascinating applications in atomic and molecular...

Sete, Eyob Alebachew

2012-10-19T23:59:59.000Z

135

Clean Cities: Trev Hall  

NLE Websites -- All DOE Office Websites (Extended Search)

About About Printable Version Share this resource Send a link to Clean Cities: Trev Hall to someone by E-mail Share Clean Cities: Trev Hall on Facebook Tweet about Clean Cities: Trev Hall on Twitter Bookmark Clean Cities: Trev Hall on Google Bookmark Clean Cities: Trev Hall on Delicious Rank Clean Cities: Trev Hall on Digg Find More places to share Clean Cities: Trev Hall on AddThis.com... Goals & Accomplishments Partnerships Hall of Fame Contacts Trev Hall Clean Cities Regional Manager Trev Hall is the point of contact for Clean Cities' coalitions in Alabama, Florida, Georgia, Mississippi, North Carolina, South Carolina, and Tennessee. His responsibilities include facilitating the efforts of the Clean Cities coalitions to increase the use of alternative fuels and

136

Spin-dependent Hall effect in a parabolic well with a quasi-three-dimensional electron gas G. M. Gusev, C. A. Duarte, A. A. Quivy, T. E. Lamas, and J. R. Leite*  

E-Print Network (OSTI)

dependent coefficient, and is the angle between the magnetic field and the normal to the well plane valve tran- sistor or other spintronic devices, however, the existence of such a spin-dependent property has not been studied yet in transport coefficients. Only the recently spin-related quantum Hall

Gusev, Guennady

137

Hall viscosity, spin density, and torsion  

E-Print Network (OSTI)

We investigate the relationship between Hall viscosity, spin density and response to geometric torsion. For the most general effective action for relativistic gapped systems, the presence of non-universal terms implies that there is no relationship between torsion response and Hall viscosity. We also consider free relativistic and non-relativistic microscopic actions and again verify the existence of analogous non-universal couplings. Explicit examples demonstrate that torsion response is unrelated to both Hall viscosity and spin density. We also argue that relativistic gapped theories must have vanishing Hall viscosity in Lorentz invariant vacuums.

Geracie, Michael; Roberts, Matthew M

2014-01-01T23:59:59.000Z

138

Casimir effect from macroscopic quantum electrodynamics  

E-Print Network (OSTI)

The canonical quantization of macroscopic electromagnetism was recently presented in New J. Phys. 12 (2010) 123008. This theory is here used to derive the Casimir effect, by considering the special case of thermal and zero-point fields. The stress-energy-momentum tensor of the canonical theory follows from Noether's theorem, and its electromagnetic part in thermal equilibrium gives the Casimir energy density and stress tensor. The results hold for arbitrary inhomogeneous magnetodielectrics and are obtained from a rigorous quantization of electromagnetism in dispersive, dissipative media. Continuing doubts about the status of the standard Lifshitz theory as a proper quantum treatment of Casimir forces do not apply to the derivation given here. Moreover, the correct expressions for the Casimir energy density and stress tensor inside media follow automatically from the simple restriction to thermal equilibrium, without the need for complicated thermodynamical or mechanical arguments.

T. G. Philbin

2011-06-09T23:59:59.000Z

139

Quantum spin Hall effect in two-dimensional transition metal dichalcogenides  

Science Journals Connector (OSTI)

...calculating the one-particle Greens function with application...Band gaps and quasiparticle energies . Phys. Rev. B 34 , 5390...calculation of bulk and surface Green functions . J. Phys. F 15...Wannier functions for composite energy bands . Phys. Rev. B 56...

Xiaofeng Qian; Junwei Liu; Liang Fu; Ju Li

140

2D massless QED Hall half-integer conductivity and graphene  

E-Print Network (OSTI)

Starting from the photon self-energy tensor in a magnetized medium, the 3D complete antisymmetric form of the conductivity tensor is found in the static limit of a fermion system $C$ non-invariant under fermion-antifermion exchange. The massless relativistic 2D fermion limit in QED is derived by using the compactification along the dimension parallel to the magnetic field. In the static limit and at zero temperature the main features of quantum Hall effect (QHE) are obtained: the half-integer QHE and the minimum value proportional to $e^2/h$ for the Hall conductivity . For typical values of graphene the plateaus of the Hall conductivity are also reproduced.

A. Prez Martnez; E. Rodriguez Querts; H. Prez Rojas; R. Gaitan; S. Rodriguez Romo

2011-10-13T23:59:59.000Z

Note: This page contains sample records for the topic "quantum hall effect" 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

Wright Hall "0 250 500125  

E-Print Network (OSTI)

. 211 Kenny Rd. Field House Pound Hall 202 McGowan Rd. 213 Kenny Rd. Warehouse Wright Hall Quarters B

Arnold, Jonathan

142

Effects of environmental parameters to total, quantum and classical correlations  

E-Print Network (OSTI)

We quantify the total, quantum, and classical correlations with entropic measures, and quantitatively compare these correlations in a quantum system, as exemplified by a Heisenberg dimer which is subjected to the change of environmental parameters: temperature and nonuniform external field. Our results show that the quantum correlation may exceed the classical correlation at some nonzero temperatures, though the former is rather fragile than the later under thermal fluctuation. The effect of the external field to the classical correlation is quite different from the quantum correlation.

Wen-Ling Chan; Jun-Peng Cao; Dong Yang; Shi-Jian Gu

2006-12-29T23:59:59.000Z

143

Radiation effects in Si-Ge quantum size structure (Review)  

SciTech Connect

The article is dedicated to the review and analysis of the effects and processes occurring in Si-Ge quantum size semiconductor structures upon particle irradiation including ion implantation. Comparisons to bulk materials are drawn. The reasons of the enhanced radiation hardness of superlattices and quantum dots are elucidated. Some technological applications of the radiation treatment are reviewed.

Sobolev, N. A., E-mail: sobolev@ua.pt [Universidade de Aveiro, Departamento de Fisica and I3N (Portugal)

2013-02-15T23:59:59.000Z

144

Housing services Zinfandel Hall  

E-Print Network (OSTI)

resources, the library, and the Internet. The Community has its own dining hall, swimming pools, study roomsHousing services Zinfandel Hall (707) 664-2541 Fax: (707) 664-4158 e-mail: ssu hall suites and campus apartments, all located just seconds from the main campus classroom buildings

Ravikumar, B.

145

Hall Handbook 2010 2011  

E-Print Network (OSTI)

Hall Handbook 2010 ­ 2011 Daisy Bank #12;1 WELCOME We offer you a warm welcome to Daisy Bank Hall Mark Irwin Warden Hall Manager September 2010 This Handbook supplements your Terms of Occupancy of the `key' Terms. This list does not contain all of the Terms and reading it should not replace a careful

146

Memory effects in quantum channel discrimination  

E-Print Network (OSTI)

We consider quantum-memory assisted protocols for discriminating quantum channels. We show that for optimal discrimination of memory channels, memory assisted protocols are needed. This leads to a new notion of distance for channels with memory. For optimal discrimination and estimation of sets of unitary channels memory-assisted protocols are not required.

Giulio Chiribella; Giacomo M. D'Ariano; Paolo Perinotti

2008-03-21T23:59:59.000Z

147

Monte Carlo simulation of quantum Zeno effect in the brain  

E-Print Network (OSTI)

Environmental decoherence appears to be the biggest obstacle for successful construction of quantum mind theories. Nevertheless, the quantum physicist Henry Stapp promoted the view that the mind could utilize quantum Zeno effect to influence brain dynamics and that the efficacy of such mental efforts would not be undermined by environmental decoherence of the brain. To address the physical plausibility of Stapp's claim, we modeled the brain using quantum tunneling of an electron in a multiple-well structure such as the voltage sensor in neuronal ion channels and performed Monte Carlo simulations of quantum Zeno effect exerted by the mind upon the brain in the presence or absence of environmental decoherence. The simulations unambiguously showed that the quantum Zeno effect breaks down for timescales greater than the brain decoherence time. To generalize the Monte Carlo simulation results for any n-level quantum system, we further analyzed the change of brain entropy due to the mind probing actions and proved a theorem according to which local projections cannot decrease the von Neumann entropy of the unconditional brain density matrix. The latter theorem establishes that Stapp's model is physically implausible but leaves a door open for future development of quantum mind theories provided the brain has a decoherence-free subspace.

Danko Georgiev

2014-12-11T23:59:59.000Z

148

Quantum effects in electron beam pumped GaAs  

SciTech Connect

Propagation of waves in nano-sized GaAs semiconductor induced by electron beam are investigated. A dispersion relation is derived by using quantum hydrodynamics equations including the electrons and holes quantum recoil effects, exchange-correlation potentials, and degenerate pressures. It is found that the propagating modes are instable and strongly depend on the electron beam parameters, as well as the quantum recoil effects and degenerate pressures. The instability region shrinks with the increase of the semiconductor number density. The instability arises because of the energetic electron beam produces electron-hole pairs, which do not keep in phase with the electrostatic potential arising from the pair plasma.

Yahia, M. E. [Faculty of Engineering, The British University in Egypt (BUE), El-Shorouk City, Cairo (Egypt) [Faculty of Engineering, The British University in Egypt (BUE), El-Shorouk City, Cairo (Egypt); National Institute of Laser Enhanced Sciences (NILES), Cairo University (Egypt); Azzouz, I. M. [National Institute of Laser Enhanced Sciences (NILES), Cairo University (Egypt)] [National Institute of Laser Enhanced Sciences (NILES), Cairo University (Egypt); Moslem, W. M. [Department of Physics, Faculty of Science, Port Said University, Port Said (Egypt)] [Department of Physics, Faculty of Science, Port Said University, Port Said (Egypt)

2013-08-19T23:59:59.000Z

149

Electron effective mass in Al{sub 0.72}Ga{sub 0.28}N alloys determined by mid-infrared optical Hall effect  

SciTech Connect

The effective electron mass parameter in Si-doped Al{sub 0.72}Ga{sub 0.28}N is determined to be m{sup ?}=(0.3360.020)?m{sub 0} from mid-infrared optical Hall effect measurements. No significant anisotropy of the effective electron mass parameter is found supporting theoretical predictions. Assuming a linear change of the effective electron mass with the Al content in AlGaN alloys and m{sup ?}=0.232?m{sub 0} for GaN, an average effective electron mass of m{sup ?}=0.376?m{sub 0} can be extrapolated for AlN. The analysis of mid-infrared spectroscopic ellipsometry measurements further confirms the two phonon mode behavior of the E{sub 1}(TO) and one phonon mode behavior of the A{sub 1}(LO) phonon mode in high-Al-content AlGaN alloys as seen in previous Raman scattering studies.

Schche, S., E-mail: schoeche@huskers.unl.edu; Khne, P.; Hofmann, T.; Schubert, M. [Department of Electrical Engineering and CNFM, University of Nebraska-Lincoln, Lincoln, Nebraska, 68588-0511 (United States)] [Department of Electrical Engineering and CNFM, University of Nebraska-Lincoln, Lincoln, Nebraska, 68588-0511 (United States); Nilsson, D.; Kakanakova-Georgieva, A.; Janzn, E.; Darakchieva, V. [Department of Physics, Chemistry and Biology (IFM), Linkping University, Linkping, 581 83 (Sweden)] [Department of Physics, Chemistry and Biology (IFM), Linkping University, Linkping, 581 83 (Sweden)

2013-11-18T23:59:59.000Z

150

Optimal Quantum Pumps  

E-Print Network (OSTI)

We study adiabatic quantum pumps on time scales that are short relative to the cycle of the pump. In this regime the pump is characterized by the matrix of energy shift which we introduce as the dual to Wigner's time delay. The energy shift determines the charge transport, the dissipation, the noise and the entropy production. We prove a general lower bound on dissipation in a quantum channel and define optimal pumps as those that saturate the bound. We give a geometric characterization of optimal pumps and show that they are noiseless and transport integral charge in a cycle. Finally we discuss an example of an optimal pump related to the Hall effect.

J. E. Avron; A. Elgart; G. M. Graf; L. Sadun

2001-07-12T23:59:59.000Z

151

The Hall  

NLE Websites -- All DOE Office Websites (Extended Search)

nonideal effects violate the frozen plasma condition and cause breaking of magnetic field lines leading to recon- nection. Electric field E is a measure of the change of mag-...

152

Quantum effects improve the energy efficiency of feedback control  

E-Print Network (OSTI)

The laws of thermodynamics apply equally well to quantum systems as to classical systems, and because of this quantum effects do not change the fundamental thermodynamic efficiency of isothermal refrigerators or engines. We show that, despite this fact, quantum mechanics permits measurement-based feedback control protocols that are more thermodynamically efficient than their classical counterparts. As part of our analysis we perform a detailed accounting of the thermodynamics of unitary feedback control, and elucidate the sources of inefficiency in measurement-based and coherent feedback.

Jordan M. Horowitz; Kurt Jacobs

2014-04-15T23:59:59.000Z

153

Anomalous conductivity in Hall thrusters: Effects of the non-linear coupling of the electron-cyclotron drift instability with secondary electron emission of the walls  

SciTech Connect

With the help of an implicit particle-in-cell code, we have shown in a previous paper that the electron-cyclotron drift instability was able to induce anomalous conductivity as well as anomalous heating. As such it can be a major actor among the mechanisms involved in the operation of Hall thrusters. However, experimental results show that the nature of wall material has a significant effect on the behavior of the thruster. The purpose of this paper is to study the plasma-wall interaction in the case where the plasma is heated self-consistently by electrostatic fluctuations induced by the electron-cyclotron drift instability.

Hron, A.; Adam, J. C. [Centre de physique thorique, CNRS-Ecole Polytechnique, 91128 Palaiseau Cedex (France)] [Centre de physique thorique, CNRS-Ecole Polytechnique, 91128 Palaiseau Cedex (France)

2013-08-15T23:59:59.000Z

154

Negative Muon Chemistry: The Quantum Muon Effect and the Finite Nuclear Mass Effect  

Science Journals Connector (OSTI)

Negative Muon Chemistry: The Quantum Muon Effect and the Finite Nuclear Mass Effect ... In this approach electrons and muons are described as quantum waves. ... The nonrelativistic Hamiltonian, Htot, of a molecular system containing Ne electrons, N? muons, and Nnuc nuclei is(1)here m? is the muon mass and MA and ZA are the mass and charge of nucleus A, respectively. ...

Edwin Posada; Flix Moncada; Andrs Reyes

2014-09-04T23:59:59.000Z

155

Contracting Around Hall Street  

E-Print Network (OSTI)

This Article examines the extent to which expanded court review of arbitration awards remains available after the Supreme Courts decision in Hall Street Associates, L.L.C. v. Mattel, Inc. - that is, whether parties can contract around Hall Street...

Drahozal, Christopher R.

2010-01-01T23:59:59.000Z

156

HAMILTON, ONTARIO HAMILTON HALL  

E-Print Network (OSTI)

HAMILTON, ONTARIO L8S 4K1 HAMILTON HALL ROOM 103A Phone: (905) 525-9140 Ext. 20297/24682 Fax: (905.doc #12;HAMILTON, ONTARIO L8S 4K1 HAMILTON HALL ROOM 103A (905) 525-9140 Ext. 20297/24682 Fax: (905) 522

Thompson, Michael

157

HAMILTON, ONTARIO HAMILTON HALL  

E-Print Network (OSTI)

HAMILTON, ONTARIO L8S 4K1 HAMILTON HALL ROOM 103A 905-525-9140 EXT. 24682 FAX: 905-522-8320 mufa:\\My Documents\\General Meetings\\Apr 28-11\\agenda.wpd #12;HAMILTON, ONTARIO L8S 4K1 HAMILTON HALL ROOM 103A 905

Thompson, Michael

158

Quantum effects in unimolecular reaction dynamics  

SciTech Connect

This work is primarily concerned with the development of models for the quantum dynamics of unimolecular isomerization and photodissociation reactions. We apply the rigorous quantum methodology of a Discrete Variable Representation (DVR) with Absorbing Boundary Conditions (ABC) to these models in an attempt to explain some very surprising results from a series of experiments on vibrationally excited ketene. Within the framework of these models, we are able to identify the experimental signatures of tunneling and dynamical resonances in the energy dependence of the rate of ketene isomerization. Additionally, we investigate the step-like features in the energy dependence of the rate of dissociation of triplet ketene to form {sup 3}B{sub 1} CH{sub 2} + {sup 1}{sigma}{sup +} CO that have been observed experimentally. These calculations provide a link between ab initio calculations of the potential energy surfaces and the experimentally observed dynamics on these surfaces. Additionally, we develop an approximate model for the partitioning of energy in the products of photodissociation reactions of large molecules with appreciable barriers to recombination. In simple bond cleavage reactions like CH{sub 3}COCl {yields} CH{sub 3}CO + Cl, the model does considerably better than other impulsive and statistical models in predicting the energy distribution in the products. We also investigate ways of correcting classical mechanics to include the important quantum mechanical aspects of zero-point energy. The method we investigate is found to introduce a number of undesirable dynamical artifacts including a reduction in the above-threshold rates for simple reactions, and a strong mixing of the chaotic and regular energy domains for some model problems. We conclude by discussing some of the directions for future research in the field of theoretical chemical dynamics.

Gezelter, J.D.

1995-12-01T23:59:59.000Z

159

Stephen F. & Camilla T. Brauer Hall & Preston M. Green Hall  

E-Print Network (OSTI)

. #12;3 4. Engineering & Business Collaboration Space, Lower Level at Green Hall: Low VOC finishes1 Stephen F. & Camilla T. Brauer Hall & Preston M. Green Hall: LEED® Building Tour Preston M. Green Hall was completed in August of 2011. Washington University has adopted a holistic

Subramanian, Venkat

160

Hall and electroreflectance studies of the effects of doping in mercurycadmium telluride grown by molecular?beam epitaxy  

Science Journals Connector (OSTI)

Hall and electrolyte electroreflectance (EER) measurements have been performed on a series of mercurycadmium telluride samples grown by molecular?beam heteroepitaxy on semi?insulating GaAs substrates and varying from p type to heavily dopedn type. Our results show for as?grown n?type samples grown under nearly ideal conditions that the mobilities are high and that the n character is not primarily associated with defects. Our Hall results show that as one departs from nearly ideal growth conditions in order to obtain higher n?type doping levels the mobility decreases precipitously. An analysis of the temperature dependence of the mobility suggests that this decrease is associated with a rapid increase in both the number of ionized impurities and the number of neutral scattering centers. Our EER results show that the initial decrease of the mobility is associated with the formation of inhomogeneous strains and to a lesser extent both point defects and two?dimensional structural faults. They also show that the final precipitous decline in the high?temperature mobility is associated with a decrease in the density of inhomogeneous strains accompanied by the formation of many more two?dimensional structural faults although they are not sensitive to the high degree of compensation which is largely responsible for the precipitous decline in the low?temperature mobility.

Paul M. Raccah; J. W. Garland; Z. Zhang; Amy H. M. Chu; J. Reno; I. K. Sou; M. Boukerche; J. P. Faurie

1986-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "quantum hall effect" 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

Clean Cities: Trev Hall  

NLE Websites -- All DOE Office Websites (Extended Search)

Trev Hall Trev Hall Clean Cities Regional Manager Trev Hall is the point of contact for Clean Cities' coalitions in Alabama, Florida, Georgia, Mississippi, North Carolina, South Carolina, and Tennessee. His responsibilities include facilitating the efforts of the Clean Cities coalitions to increase the use of alternative fuels and vehicles through the development of public-private partnerships. Along with traditional project management duties, Hall facilitates technology deployment strategies, evaluates proper alternative fuel technologies, determines resource availability, provides technical assistance, contributes areas of expertise, and supports transportation market transformation activities. Hall started with the U.S. Department of Energy as a project manager in the Weatherization Assistance Program in 2009. He has a Bachelor of Science in industrial engineering and a master's degree in business administration from West Virginia University. Hall brings experience working as a process-improvement engineer, co-founding start-ups, and leading small-growth companies. Hall has served as an adjunct professor at West Virginia University teaching entrepreneurship/business planning and has a passion for training, technology, marketing, and outreach.

162

Hall A Annual Report 2013  

SciTech Connect

Report over the experimental activities in Hall A at Thomas Jefferson National Accelerator Facility during 2013.

Dalton, Mark M.

2014-02-01T23:59:59.000Z

163

Hall A Annual Report 2013  

E-Print Network (OSTI)

Report over the experimental activities in Hall A at Thomas Jefferson National Accelerator Facility during 2013.

M. M. Dalton; K. Allada; K. Aniol; W. Boeglin; A. Camsonne; E. Chudakov; M. Cummings; D. Flay; M. Friedman; O. Glamazdin; J. Gomez; C. Keppel; H. P. Khanal; R. Lindgren; E. Long; R. Michaels; M. Mihovilovi?; C. Muoz Camacho; S. Nanda; R. Pomatsalyuk; S. Riordan; S. irca; C. Smith; P. Solvignon; N. F. Sparveris; V. Vereshchaka; X. Yan; Z. Ye; Y. X. Zhao; Jefferson Lab Hall A Collaboration

2014-02-27T23:59:59.000Z

164

Scaling of Decoherence Effects in Quantum Computers  

E-Print Network (OSTI)

The scaling of decoherence rates with the number of q-bits is studied for a simple quantum computer model. Two state q-bits are localised around well-separated positions via trapping potentials, but vibrational motion of q-bits centre of mass motion occurs. Coherent one and two q-bit gating processes are controlled by external classical fields and facilitated by a high Q cavity mode. Decoherence due to q-bit and cavity mode coupling to a bath of spontaneous emission modes, cavity decay modes and to the vibrational modes is treated. A non-Markovian treatment of the short time behaviour of the fidelity is presented, enabling time scales for decoherence to be determined, together with their dependence on q-bit number for the case where the q-bit/cavity mode system is in a pure state and the baths are in thermal states.

B. J. Dalton

2003-01-17T23:59:59.000Z

165

Macroscopic quantum tunneling and the 'cosmic' Josephson effect  

SciTech Connect

We discuss the possible influence of a cosmic magnetic field on the macroscopic quantum tunneling process associated, in a cosmological context, to the decay of the 'false vacuum'. We find a close analogy with the effects of an external magnetic field applied to a Josephson junction in the context of low-temperature/high-temperature superconducting devices.

Barone, A. [Dipartimento di Scienze Fisiche, Universita di Napoli 'Federico II', CNR-SPIN, Piazzale Tecchio 21, 80125 Napoli (Italy); Gasperini, M. [Dipartimento di Fisica, Universita di Bari, Via G. Amendola 173, 70126 Bari (Italy); INFN, Sezione di Bari, Bari (Italy); Rotoli, G. [Dipartimento di Ingegneria dell'Informazione, Seconda Universita di Napoli (SUN), Via Roma 29, 81031 Aversa (CE) (Italy)

2010-10-15T23:59:59.000Z

166

Quantum Coherence Effects and the Second Law of Thermodynamics  

Science Journals Connector (OSTI)

...research-article Quantum Coherence Effects and the Second Law of Thermodynamics L. H. Ford Negative energy densities and fluxes...fluxes seemingly lead to a breakdown of the second law of thermodynamics. It is argued that such a breakdown will not in...

1978-01-01T23:59:59.000Z

167

WORKFORCE DIVERSITY TOWN HALL  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

WORKFORCE DIVERSITY TOWN HALL WORKFORCE DIVERSITY TOWN HALL DECEMBER 6, 2011 1:00-2:00 PM FORRESTAL MAIN AUDITORIUM (BROADCAST TO ALL SITES) F O C U S M I S S I O N L E A R N I N G C O N T I N U A L DIVERSITY AND INCLUSION A C C O U N T A B I L I T Y WORKFORCE DIVERSITY TOWN HALL "When any of our citizens are unable to fulfill their potential due to the factors that have nothing to do with their talent, character, or work ethic, then I believe there's a role for government to play."

168

Manipulating the Kondo Resonance through Quantum Size Effects  

Science Journals Connector (OSTI)

Manipulating the Kondo effect by quantum confinement has been achieved by placing magnetic molecules on silicon-supported nanostructures. The Kondo resonance of individual manganese phthalocyanine (MnPc) molecules adsorbed on the top of Pb islands was studied by scanning tunneling spectroscopy. Oscillating Kondo temperatures as a function of film thickness were observed and attributed to the formation of the thickness-dependent quantum-well states in the host Pb islands. The present approach provides a technologically feasible way for single spin manipulation by precise thickness control of thin films.

Ying-Shuang Fu; Shuai-Hua Ji; Xi Chen; Xu-Cun Ma; Rui Wu; Chen-Chen Wang; Wen-Hui Duan; Xiao-Hui Qiu; Bo Sun; Ping Zhang; Jin-Feng Jia; Qi-Kun Xue

2007-12-20T23:59:59.000Z

169

Quantum plasmon effects in epsilon-near-zero metamaterials  

E-Print Network (OSTI)

Dispersion properties of metals and propagation of quantum bulk plasmon in the high photon energy regime are studied. The nonlocal dielectric permittivity of a metal is determined by the quantum plasma effects and is calculated by applying the Wigner equation in the kinetic theory and taking into account the electron lattice collisions. The properties of epsilon near zero material are investigated in a thin gold film. The spectrum and the damping rate of the quantum bulk plasmon are obtained for a wide range of energies, and the electron wave function is analytically calculated in both classical and quantum limits. It is shown that the quantum bulk plasmons exist with a propagation length of 1 to 10nm, which strongly depends on the electron energy. The propagation length is found to be much larger than the propagation length in the classical regime which is comparable to the atomic radius and the average inter particle distance. It is found that the spatial localization of the electron wave function is extend...

Moaied, M; Ostrikov, K

2014-01-01T23:59:59.000Z

170

JOURNAL DE PHYSIQUE Colloque C5, suppliment au no 5, Tome 40, Mai 1979, page C5-38 Magnetoresistance and anomalous Hall effect of magnesium singIe crystals  

E-Print Network (OSTI)

-38 Magnetoresistance and anomalous Hall effect of magnesium singIe crystals with heavy rare earth impurities J. Bijvoet splitting, the magnetization of rare earth ions in magnesium single crystals is anisotropic at low and cannot be explained by crystal field splitting of the 4f levels. Single crystals of magnesium with small

Paris-Sud XI, Université de

171

Hall Ammendment Policy  

Energy.gov (U.S. Department of Energy (DOE))

Joint statement providing interim policy on processing proposals for leasing DOE real property using the authority in 42 U.S.C. 7256, commonly referred to as the "Hall Amendment."

172

American Institute of Aeronautics and Astronautics Investigations of Probe Induced Perturbations in a Hall Thruster  

E-Print Network (OSTI)

sized PPPL Hall Thruster2 . This study contains a further examination into the causes and effects;American Institute of Aeronautics and Astronautics 2 Figure 1: PPPL 9cm Hall thruster with stationary

173

Conference Center Lecture Hall  

NLE Websites -- All DOE Office Websites (Extended Search)

401 Library Take the elevators downstairs to the Gallery. 401 Library Take the elevators downstairs to the Gallery. Conference Center Lecture Hall The Lecture Hall is a fully-equipped site for meetings of up to 540 people. This total includes: 237 seats on the Lecture Hall main level; 161 seats in the Lecture Hall balcony; and 142 seats in the two flexible rooms under the balcony (with interior walls removed). These rooms can also be used for meetings, both individually (32 classroom-style seats) or together (72 classroom-style seats). An additional 80 people can be seated in the nearby seminar room (A1100). Photo of the Conference Center's Lecture Hall Conference Center Gallery Seminar Room (A1101) The Seminar Room is located just off the Atrium. Conference Center Lecture Hall Atrium The Conference Center Atrium provides an open, elegant space ideal for registration, informational displays, and social hours. Computers are located just off the Atruim for e-mail access.

174

Memory effects in attenuation and amplification quantum processes  

E-Print Network (OSTI)

With increasing communication rates via quantum channels, memory effects become unavoidable whenever the use rate of the channel is comparable to the typical relaxation time of the channel environment. We introduce a model of a bosonic memory channel, describing correlated noise effects in quantum-optical processes via attenuating or amplifying media. To study such a channel model, we make use of a proper set of collective field variables, which allows us to unravel the memory effects, mapping the n-fold concatenation of the memory channel to a unitarily equivalent, direct product of n single-mode bosonic channels. We hence estimate the channel capacities by relying on known results for the memoryless setting. Our findings show that the model is characterized by two different regimes, in which the cross correlations induced by the noise among different channel uses are either exponentially enhanced or exponentially reduced.

Cosmo Lupo; Vittorio Giovannetti; Stefano Mancini

2010-05-17T23:59:59.000Z

175

On the implications of the Quantum-Pigeonhole Effect  

E-Print Network (OSTI)

There has been considerable interest in a recent preprint - arXiv/1407.3194 - describing an effect named as the Quantum Pigeonhole Principle. The classical pigeonhole principle (classical PHP) refers to a result in number theory which states that if n objects are distributed between m boxes, with m less than n, then at least one box must contain more than one object. An experiment is proposed in the preprint where interactions between particles would reveal that they were in the same box, but a quantum mechanical measurement would imply that no more than 1 of the n objects is contained in any of the m boxes, even though n is greater than m. This result has been greeted by the authors of the preprint and some others as being of great importance in the understanding of quantum mechanics. In this paper we show by a full quantum mechanical treatment that the effect appears to arise as a result of interference between the components of the wavefunctions, each of which is subject to the classical PHP.

Alastair Rae; Ted Forgan

2014-12-04T23:59:59.000Z

176

Energy spectrum, dissipation, and spatial structures in reduced Hall magnetohydrodynamic  

SciTech Connect

We analyze the effect of the Hall term in the magnetohydrodynamic turbulence under a strong externally supported magnetic field, seeing how this changes the energy cascade, the characteristic scales of the flow, and the dynamics of global magnitudes, with particular interest in the dissipation. Numerical simulations of freely evolving three-dimensional reduced magnetohydrodynamics are performed, for different values of the Hall parameter (the ratio of the ion skin depth to the macroscopic scale of the turbulence) controlling the impact of the Hall term. The Hall effect modifies the transfer of energy across scales, slowing down the transfer of energy from the large scales up to the Hall scale (ion skin depth) and carrying faster the energy from the Hall scale to smaller scales. The final outcome is an effective shift of the dissipation scale to larger scales but also a development of smaller scales. Current sheets (fundamental structures for energy dissipation) are affected in two ways by increasing the Hall effect, with a widening but at the same time generating an internal structure within them. In the case where the Hall term is sufficiently intense, the current sheet is fully delocalized. The effect appears to reduce impulsive effects in the flow, making it less intermittent.

Martin, L. N.; Dmitruk, P. [Departamento de Fisica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires and IFIBA, CONICET, Ciudad Universitaria, 1428 Buenos Aires (Argentina); Gomez, D. O. [Departamento de Fisica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires and IFIBA, CONICET, Ciudad Universitaria, 1428 Buenos Aires (Argentina); Instituto de Astronomia y Fisica del Espacio, CONICET, Buenos Aires (Argentina)

2012-05-15T23:59:59.000Z

177

Relativistic Doppler effect in quantum communication  

E-Print Network (OSTI)

When an electromagnetic signal propagates in vacuo, a polarization detector cannot be rigorously perpendicular to the wave vector because of diffraction effects. The vacuum behaves as a noisy channel, even if the detectors are perfect. The ``noise'' can however be reduced and nearly cancelled by a relative motion of the observer toward the source. The standard definition of a reduced density matrix fails for photon polarization, because the transversality condition behaves like a superselection rule. We can however define an effective reduced density matrix which corresponds to a restricted class of positive operator-valued measures. There are no pure photon qubits, and no exactly orthogonal qubit states.

Asher Peres; Daniel R. Terno

2002-08-20T23:59:59.000Z

178

E-Print Network 3.0 - asymmetric coupled quantum Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

systems in the fractional quantum Hall regime. Ben... the quantum dynamics of mesoscopic Josephson junctions. They showed that the coherent tunneling of Cooper pair Source: Busch,...

179

Electron-wall interaction in Hall thrustersa... Y. Raitsesb  

E-Print Network (OSTI)

Electron-wall interaction in Hall thrustersa... Y. Raitsesb and D. Staack Princeton Plasma Physics; accepted 22 February 2005; published online 2 May 2005 Electron-wall interaction effects in Hall thrusters this threshold, the electron energy gain is constant in the acceleration region and therefore, secondary electron

180

Post-Newtonian gravitational effects in quantum interferometry  

E-Print Network (OSTI)

We investigate general properties of optical interferometry in stationary spacetimes and apply the obtained results focusing on quantum-optical experiments in near-Earth environments. We provide a rigorous expression for the {gravitationally induced} phase difference and adapt the parametrized post-Newtonian formalism for calculations of polarization rotation. We investigate two optical versions of the Colella-Overhauser-Werner experiment and show that the phase difference is independent of the post-Newtonian parameter $\\gamma$, making it a possible candidate for an optical test of the Einstein equivalence principle. Polarization rotation provides an example of the quantum clock variable, and while related to the optical Lense-Thirring effects, shows a qualitatively different behaviour.

Aharon Brodutch; Alexei Gilchrist; Thomas Guff; Alexander R. H. Smith; Daniel R. Terno

2014-12-08T23:59:59.000Z

Note: This page contains sample records for the topic "quantum hall effect" 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

Quantum Algorithms for Approximating the Effective Resistances in Electrical Networks  

E-Print Network (OSTI)

The theory of electrical network has many applications in algorithm design and analysis. It is an important task to compute the basic quantities about electrical networks, such as electrical flows and effective resistances, as quickly as possible. Classically, to compute these quantities, one basically need to solve a Laplacian linear system, and the best known algorithms take $\\tilde{O}(m)$ time, where $m$ is the number of edges. In this paper, we present two quantum algorithms for approximating the effective resistance between any two vertices in an electrical network. Both of them have time complexity polynomial in $\\log{n}$, $d$, $c$, $1/\\phi$ and $1/\\epsilon$, where $n$ is the number of vertices, $d$ is the maximum degree of the vertices, $c$ is the ratio of the largest to the smallest edge resistance, $\\phi$ is the expansion of the network, and $\\epsilon$ is the relative error. In particular, when $d$ and $c$ are small and $\\phi$ is large, our algorithms run very fast. In contrast, it is unknown whether classical algorithms can solve this case very fast. Furthermore, we prove that the polynomial dependence on the inverse expansion (i.e. $1/\\phi$) is necessary. As a consequence, our algorithms cannot be significantly improved. Finally, as a by-product, our second algorithm also produces a quantum state approximately proportional to the electrical flow between any two vertices, which might be of independent interest. Our algorithms are based on using quantum tools to analyze the algebraic properties of graph-related matrices. While one of them relies on inverting the Laplacian matrix, the other relies on projecting onto the kernel of the weighted incidence matrix. It is hopeful that more quantum algorithms can be developed in similar way.

Guoming Wang

2013-11-08T23:59:59.000Z

182

Effect of carrier dynamics and temperature on two-state lasing in semiconductor quantum dot lasers  

SciTech Connect

It is analytically shown that the both the charge carrier dynamics in quantum dots and their capture into the quantum dots from the matrix material have a significant effect on two-state lasing phenomenon in quantum dot lasers. In particular, the consideration of desynchronization in electron and hole capture into quantum dots allows one to describe the quenching of ground-state lasing observed at high injection currents both qualitatevely and quantitatively. At the same time, an analysis of the charge carrier dynamics in a single quantum dot allowed us to describe the temperature dependences of the emission power via the ground- and excited-state optical transitions of quantum dots.

Korenev, V. V., E-mail: korenev@spbau.ru; Savelyev, A. V.; Zhukov, A. E.; Omelchenko, A. V.; Maximov, M. V. [Saint Petersburg Academic University-Nanotechnology Research and Education Center (Russian Federation)] [Saint Petersburg Academic University-Nanotechnology Research and Education Center (Russian Federation)

2013-10-15T23:59:59.000Z

183

Hall Drag and Magnetodrag in Graphene  

Science Journals Connector (OSTI)

Massless Dirac fermions in graphene at charge neutrality form a strongly interacting system in which both charged and neutral (energy) modes play an important role. These modes are essentially decoupled in the absence of a magnetic field, but become strongly coupled when the field is applied. We show that this regime is characterized by strong magnetodrag and Hall drag, originating from long-range energy currents and spatial temperature gradients. The energy-driven effects arise in a wide temperature range, and feature an unusually strong dependence on field and carrier density. We argue that this mechanism accounts for the recently observed giant magnetodrag and Hall drag occurring at classically weak fields.

Justin C. W. Song and Leonid S. Levitov

2013-09-17T23:59:59.000Z

184

Prototype dining hall energy efficiency study  

SciTech Connect

The energy consumption of food service facilities is among the highest of any commercial building type, owing to the special requirements for food preparation, sanitation, and ventilation. Consequently, the US Air Force Engineering and Services Center (AFESC) contracted with Pacific Northwest Laboratory (PNL) to collect and analyze end-use energy consumption data for a prototypical dining hall and make specific recommendations on cost-effective energy conservation options. This information will be used to establish or update criteria for dining hall designs and retrofits as appropriate. 6 refs., 21 figs., 23 tabs.

Mazzucchi, R.P.; Bailey, S.A.; Zimmerman, P.W.

1988-06-01T23:59:59.000Z

185

Hall Handbook 2010 2011  

E-Print Network (OSTI)

Hall Handbook 2010 ­ 2011 Broomhurst #12;1 WELCOME We offer you a warm welcome to the Broomhurst Cairns Lyn Dodd Warden Services Manager September 2010 This Handbook supplements your Terms of Occupancy prior to signing them. Below is a list of some of the `key' Terms. This list does not contain all

186

Role of Quantum Effects in the GlassTransition.  

SciTech Connect

It is shown that quantum effects lead to a significant decrease of the glass transition temperature Tg with respect to the melting temperature Tm, so that the ratio Tg=Tm can be much smaller than the typical value of 2=3 in materials where Tg is near or below 60 K. Furthermore, it is demonstrated that the viscosity or structural relaxation time in such low temperature glass formers should exhibit highly unusual temperature dependence, namely a decrease of the apparent activation energy upon approaching Tg (instead of traditional increase).

Novikov, Vladimir [ORNL; Sokolov, Alexei P [ORNL

2013-01-01T23:59:59.000Z

187

Confined Monopoles Induced by Quantum Effects in Dense QCD  

E-Print Network (OSTI)

We analytically show that mesonic bound states of confined monopoles appear inside a non-Abelian vortex-string in massless three-flavor QCD at large quark chemical potential mu. The orientational modes CP^2 in the internal space of a vortex is described by the low-energy effective world-sheet theory. Mesons of confined monopoles are dynamically generated as bound states of kinks by the quantum effects in the effective theory. The mass of monopoles is shown to be an exponentially soft scale Delta*exp[-c*(mu/Delta)^2], with the color superconducting gap Delta and some constant c. A possible quark-monopole duality between the hadron phase and the color superconducting phase is also discussed.

Minoru Eto; Muneto Nitta; Naoki Yamamoto

2011-01-13T23:59:59.000Z

188

Confined monopoles induced by quantum effects in dense QCD  

SciTech Connect

We analytically show that mesonic bound states of confined monopoles appear inside a non-Abelian vortex string in massless three-flavor QCD at large quark chemical potential {mu}. The orientational modes CP{sup 2} in the internal space of a vortex is described by the low-energy effective world-sheet theory. Mesons of confined monopoles are dynamically generated as bound states of kinks by the quantum effects in the effective theory. The mass of monopoles is shown to be an exponentially soft scale M{approx}{Delta}exp[-c({mu}/{Delta}){sup 2}], with the color superconducting gap {Delta} and some constant c. A possible quark-monopole duality between the hadron phase and the color superconducting phase is also discussed.

Eto, Minoru [Mathematical Physics Laboratory, RIKEN Nishina Center, Saitama 351-0198 (Japan); Nitta, Muneto [Department of Physics, and Research and Education Center for Natural Sciences, Keio University, 4-1-1 Hiyoshi, Yokohama, Kanagawa 223-8521 (Japan); Yamamoto, Naoki [Institute for Nuclear Theory, University of Washington, Seattle, Washington 98195-1550 (United States)

2011-04-15T23:59:59.000Z

189

The Casimir effect: from quantum to critical fluctuations  

E-Print Network (OSTI)

The Casimir effect in quantum electrodynamics (QED) is perhaps the best-known example of fluctuation-induced long-ranged force acting on objects (conducting plates) immersed in a fluctuating medium (quantum electromagnetic field in vacuum). A similar effect emerges in statistical physics, where the force acting, e.g., on colloidal particles immersed in a binary liquid mixture is affected by the classical thermal fluctuations occurring in the surrounding medium. The resulting Casimir-like force acquires universal features upon approaching a critical point of the medium and becomes long-ranged at criticality. In turn, this universality allows one to investigate theoretically the temperature dependence of the force via representative models and to stringently test the corresponding predictions in experiments. In contrast to QED, the Casimir force resulting from critical fluctuations can be easily tuned with respect to strength and sign by surface treatments and temperature control. We present some recent advances in the theoretical study of the universal properties of the critical Casimir force arising in thin films. The corresponding predictions compare very well with the experimental results obtained for wetting layers of various fluids. We discuss how the Casimir force between a colloidal particle and a planar wall immersed in a binary liquid mixture has been measured with femto-Newton accuracy, comparing these experimental results with the corresponding theoretical predictions.

Andrea Gambassi

2008-12-04T23:59:59.000Z

190

Cylindrical geometry hall thruster  

DOE Patents (OSTI)

An apparatus and method for thrusting plasma, utilizing a Hall thruster with a cylindrical geometry, wherein ions are accelerated in substantially the axial direction. The apparatus is suitable for operation at low power. It employs small size thruster components, including a ceramic channel, with the center pole piece of the conventional annular design thruster eliminated or greatly reduced. Efficient operation is accomplished through magnetic fields with a substantial radial component. The propellant gas is ionized at an optimal location in the thruster. A further improvement is accomplished by segmented electrodes, which produce localized voltage drops within the thruster at optimally prescribed locations. The apparatus differs from a conventional Hall thruster, which has an annular geometry, not well suited to scaling to small size, because the small size for an annular design has a great deal of surface area relative to the volume.

Raitses, Yevgeny (Princeton, NJ); Fisch, Nathaniel J. (Princeton, NJ)

2002-01-01T23:59:59.000Z

191

Quantum effects can render w<-1 on cosmological scales  

Science Journals Connector (OSTI)

We report on a revision of our previous computation of the renormalized expectation value of the stress-energy tensor of a massless, minimally coupled scalar with a quartic self-interaction on a locally de Sitter background. This model is important because it demonstrates that quantum effects can lead to violations of the weak energy condition on cosmological scaleson average, not just in fluctuationsalthough the effect in this particular model is far too small to be observed. The revision consists of modifying the propagator so that dimensional regularization can be used when the dimension of the renormalized theory is not four. Although the finite part of the stress-energy tensor does not change (in D=4) from our previous result, the counterterms do. We also speculate that a certain, finite and separately conserved part of the stress tensor can be subsumed into a natural correction of the initial state from free Bunch-Davies vacuum.

V. K. Onemli and R. P. Woodard

2004-11-02T23:59:59.000Z

192

The Hall D Physics Program at JLab  

SciTech Connect

GlueX is one of the flagship experiments of the 12 GeV era at the Thomas Jefferson National Accelerator Facility (JLab). The energy of the electron accelerator at JLab is presently undergoing an upgrade from 6 GeV to 12 GeV and a 4th experimental hall (Hall D) is being added. The GlueX experimental apparatus consists of a tagged coherent bremsstrahlung photon beam incident on a liquid hydrogen target. The photoproduced mesons, which are created inside of a 2.2 T solenoid, will then pass through a pair of drift chambers and eventually deposit their energy into either of two calorimeters, depending on their respective angles. GlueX will attempt to map out the light meson spectrum and search for meson-gluon hybrids to better understand the confinement of quarks and gluons in quantum chromodynamics (QCD). There is little data on the photoproduction of light mesons and the GlueX experiment will exceed the current photoproduction data by several orders of magnitude in the first year alone. Photoproduction is specifically well suited to search for meson-gluon hybrids because in the flux tube model the production cross-sections are higher for meson-gluon hybrids from photons, with the spins of the virtual quark-antiquark pair aligned, than from other sources such as pions, with the spins of the quark-antiquark pair anti-aligned. There are also other Hall D experiments proposed to look for physics beyond the Standard Model by studying Eta rare or forbidden decay channels such as eta to two neutral pions. The 12 GeV upgrade of the JLab accelerator and the complete physics program of Hall D will be presented.

Leckey, John P. [Indiana U.

2012-09-01T23:59:59.000Z

193

Quantum effects in the diffusion of hydrogen on Ru(0001)  

E-Print Network (OSTI)

An understanding of hydrogen diffusion on metal surfaces is important, not just for its role in heterogeneous catalysis and hydrogen fuel cell technology, but also because it provides model systems where tunneling can be studied under well-defined conditions. Here we report helium spin-echo measurements of the atomic-scale motion of hydrogen on the Ru(0001) surface between 75 and 250 K. Quantum effects are evident at temperatures as high as 200 K, while below 120 K we observe a tunneling-dominated temperature independent jump rate of 1.9$\\times$10$^9$ s$^{-1}$, many orders of magnitude faster than previously seen. Quantum transition state theory calculations based on ab initio path-integral simulations reproduce the temperature dependence of the rate at higher temperatures and predict a crossover to tunneling-dominated diffusion at low temperatures, although the tunneling rate is under-estimated, highlighting the need for future experimental and theoretical studies of hydrogen diffusion on well-defined surfac...

McIntosh, Eliza M; Ellis, John; Michaelides, Angelos; Allison, William

2014-01-01T23:59:59.000Z

194

Level broadening and quantum interference effects in insulators  

Science Journals Connector (OSTI)

We study quantum interference effects in the context of the Nguyen-Spivak-Shklovskii (NSS) model including level broadening due to inelastic events. Improving on a recent mean-field approach, we incorporate path correlations and study both the log-conductance and its fluctuations. In contrast with mean field, we find that all changes in the conductance, due to broadening, imply corrections to the localization length. Furthermore, the change in the magnetoconductance sign, predicted by mean field, is not borne out by direct solution of the NSS model within reasonable broadening parameters. We compute a phase diagram for the magnetoconductance in the broadening parameter space and propose a replica theory for weak inelastic events.

Ernesto Medina and Horacio Pastawski

2000-03-01T23:59:59.000Z

195

'Dark Matter' as a Quantum Foam In-Flow Effect  

E-Print Network (OSTI)

The galactic `dark matter' effect is regarded as one of the major problems in fundamental physics. Here it is explained as a self-interaction dynamical effect of space itself, and so is not caused by an unknown form of matter. Because it was based on Kepler's Laws for the motion of the planets in the solar system the Newtonian theory of gravity was too restricted. A reformulation and generalisation of the Newtonian theory of gravity in terms of a velocity in-flow field, representing at a classical level the relative motion of a quantum-foam substructure to space, reveals a key dynamical feature of the phenomenon of gravity, namely the so called `dark matter' effect, which manifests not only in spiral galaxy rotation curves, but also in the borehole g anomaly, globular and galactic black holes, and in ongoing problems in improving the accuracy with which Newton's gravitational constant G is measured. The new theory of gravity involves an additional new dimensionless gravitational constant, and experimental data reveals this to be the fine structure constant. The new theory correctly predicts the globular cluster black hole masses, and that the `frame-dragging' effect is caused by vorticity in the in-flow. The relationship of the new theory of gravity to General Relativity which, like Newtonian gravity, does not have the `dark matter' dynamics, is explained.

Reginald T. Cahill

2005-08-25T23:59:59.000Z

196

A neural network analysis of concert hall acoustics  

Science Journals Connector (OSTI)

A neural network analysis using data from 51 concert halls was undertaken. The analysis related the acoustic quality of halls as judged by musicians to ten hall parameters: volume surface area number of seats length width height mean rake angle of seats a surface diffusion index stage height and extent of stage shell/enclosure. The surface diffusion index and the extent of the stage shell were determined by a group of architects who made judgments on the basis of photographs and drawings of the halls. The results of the analysis are tentative and difficult to generalize as there are so many inputs and so many possible combinations of parameters and the effect of a particular factor is in some cases neither linear nor monotonic. The results are applied to a particular hall the concert hall of the Sydney Opera House where changes are being contemplated. There are some unexpected results which at this stage give food for thought rather than the basis for action as there are obvious limitations to this work such as extraneous factors influencing judgments of acoustic quality surface diffusion estimation and extent of the stage shell and the limited number inputs used to describe the halls. ?

Fergus R. Fricke; Young G. Han

1998-01-01T23:59:59.000Z

197

Rhodes Hall Ross Heart Hospital  

E-Print Network (OSTI)

Emergency 315 315 26 Rhodes Hall Ross Heart Hospital James Cancer Hospital Martha Morehouse.m. James Cancer Hospital 7:10 a.m. Rhodes Hall 7:13 a.m. Ross Heart Hospital 7:15 a.m. Martha Morehouse

Howat, Ian M.

198

Cylindrical Hall Thrusters Yevgeny Raitses,*  

E-Print Network (OSTI)

Plasma Physics Laboratory1,Princeton University, Princeton, NJ, 08543 The cylindrical Hall thrusterCylindrical Hall Thrusters Yevgeny Raitses,* Artem Smirnov, and Nathaniel J. Fisch§ Princeton a cross-field plasma discharge to accelerate ions. The thrust is a reaction force to this acceleration

199

E-Print Network 3.0 - ac quantum transport Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

1 2 3 4 5 > >> 1 Quantum Hall Transitions Summary: - Coddington Model Quantum Phase Transition von Klitzing's discovery Source: warwick.ac.uk RH 1 n h e2 (n 1... Quantum Phase...

200

Cost-Effective Fabrication Routes for the Productionof Quantum...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Quantum Well Type Structures and Recovery of Waste Heat from Heavy Duty Trucks Automotive Thermoelectric Generators and HVAC Thermoelectric Developments for Vehicular Applications...

Note: This page contains sample records for the topic "quantum hall effect" 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

Cost-Effective Fabrication Routes for the Production of Quantum...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Quantum-Well-Type Structures and Recovoery of Waste Heat from Heavy-Duty Trucks Thermoelectric Developments for Vehicular Applications Automotive Thermoelectric Generators and HVAC...

202

All-Optical Switching Using the Quantum Zeno Effect and Two-Photon Absorption  

E-Print Network (OSTI)

We have previously shown that the quantum Zeno effect can be used to implement quantum logic gates for quantum computing applications, where the Zeno effect was produced using a strong two-photon absorbing medium. Here we show that the Zeno effect can also be used to implement classical logic gates whose inputs and outputs are high-intensity fields (coherent states). The operation of the devices can be understood using a quasi-static analysis, and their switching times are calculated using a dynamic approach. The two-photon absorption coefficient of rubidium vapor is shown to allow operation of these devices at relatively low power levels.

B. C. Jacobs; J. D. Franson

2009-05-08T23:59:59.000Z

203

Spectral Analysis of an Effective Hamiltonian in Nonrelativistic Quantum  

E-Print Network (OSTI)

Department of Mathematics, Hokkaido University Sapporo 060-0810 Japan E-mail: arai with the quantum radiation field (for reviews on recent developments of mathematical theory of nonrelativistic QED with the quantum radiation field. This kind of approach (heuristic) was first given by Welton [14], based

204

On the Compatibility Between Quantum and Relativistic Effects in an Electromagnetic Bridge Theory  

E-Print Network (OSTI)

The Dipolar Electromagnetic Source (DEMS) model, based on the Poynting Vector Conjecture, conduces in Bridge Theory to a derivation of the Lorentz transformation connecting pairs of events. The results prove a full compatibility between quantum and relativistic effects.

Massimo Auci

2010-03-18T23:59:59.000Z

205

088 MARTIN HALL CLARICE SMITH  

E-Print Network (OSTI)

GARAGE 202 088 MARTIN HALL CLARICE SMITH PERFORMING ARTS CENTER 386 LEFRAK 038 SCHOOL OF PUBLIC HEALTH PRACTICE COMPLEX SHIPLEY FIELD AT BOB "TURTLE" SMITH STADIUM 159 COMMONS 6 975 COMMONS 5 974 SUSQUEHANNA

Anlage, Steven

206

Optimization of Cylindrical Hall Thrusters  

SciTech Connect

The cylindrical Hall thruster features high ionization efficiency, quiet operation, and ion acceleration in a large volume-to-surface ratio channel with performance comparable with the state-of-the-art annular Hall thrusters. These characteristics were demonstrated in low and medium power ranges. Optimization of miniaturized cylindrical thrusters led to performance improvements in the 50-200W input power range, including plume narrowing, increased thruster efficiency, reliable discharge initiation, and stable operation.

Yevgeny Raitses, Artem Smirnov, Erik Granstedt, and Nathaniel J. Fisch

2007-11-27T23:59:59.000Z

207

Optimization of Cylindrical Hall Thrusters  

SciTech Connect

The cylindrical Hall thruster features high ionization efficiency, quiet operation, and ion acceleration in a large volume-to-surface ratio channel with performance comparable with the state-of-the-art annular Hall thrusters. These characteristics were demonstrated in low and medium power ranges. Optimization of miniaturized cylindrical thrusters led to performance improvements in the 50-200W input power range, including plume narrowing, increased thruster efficiency, reliable discharge initiation, and stable operation. __________________________________________________

Yevgeny Raitses, Artem Smirnov, Erik Granstedt, and Nathaniel J. Fi

2007-07-24T23:59:59.000Z

208

Quantum-mechanical description of Lense-Thirring effect for relativistic scalar particles  

E-Print Network (OSTI)

Exact expression for the Foldy-Wouthuysen Hamiltonian of scalar particles is used for a quantum-mechanical description of the relativistic Lense-Thirring effect. The exact evolution of the angular momentum operator in the Kerr field approximated by a spatially isotropic metric is found. The quantum-mechanical description of the full Lense-Thirring effect based on the Laplace-Runge-Lenz vector is given in the nonrelativistic and weak-field approximation. Relativistic quantum-mechanical equations for the velocity and acceleration operators are obtained. The equation for the acceleration defines the Coriolis-like and centrifugal-like accelerations and presents the quantum-mechanical description of the frame-dragging effect.

Alexander J. Silenko

2014-08-10T23:59:59.000Z

209

Observation of the Kondo effect in a spin-3/2 hole quantum dot  

SciTech Connect

We report the observation of the Kondo effect in a spin-3/2 hole quantum dot formed near pinch-off in a GaAs quantum wire. We clearly observe two distinctive hallmarks of quantum dot Kondo physics. First, the zero-bias peak in the differential conductance splits an in-plane magnetic field and the splitting is independent of gate voltage. Second, the splitting rate is twice as large as that for the lowest one-dimensional subband. We show that the Zeeman splitting of the zero-bias peak is highly anisotropic and attribute this to the strong spin-orbit interaction for holes in GaAs.

Klochan, O.; Micolich, A. P.; Hamilton, A. R. [School of Physics, University of New South Wales, Sydney NSW 2052 (Australia); Trunov, K.; Reuter, D.; Wieck, A. D. [Angewandte Festkrperphysik, Ruhr-Universitt Bochum, D-44780 Bochum (Germany)

2013-12-04T23:59:59.000Z

210

Negative differential gain in quantum dot systems: Interplay of structural properties and many-body effects  

SciTech Connect

The saturation behaviour of optical gain with increasing excitation density is an important factor for laser device performance. For active materials based on self-organized InGaAs/GaAs quantum dots, we study the interplay between structural properties of the quantum dots and many-body effects of excited carriers in the optical properties via a combination of tight-binding and quantum-kinetic calculations. We identify regimes where either phase-space filling or excitation-induced dephasing dominates the saturation behavior of the optical gain. The latter can lead to the emergence of a negative differential material gain.

Goldmann, E., E-mail: goldmann@itp.uni-bremen.de; Jahnke, F. [Institute for Theoretical Physics, University of Bremen, Bremen 28359 (Germany); Lorke, M.; Frauenheim, T. [Bremen Center for Computational Materials Science BCCMS, University of Bremen, Bremen 28359 (Germany)

2014-06-16T23:59:59.000Z

211

Nonlocal effects: relevance for the spontaneous emission rates of quantum emitters coupled to plasmonic structures  

E-Print Network (OSTI)

The spontaneous emission rate of dipole emitters close to plasmonic dimers are theoretically studied within a nonlocal hydrodynamic model. A nonlocal model has to be used since quantum emitters in the immediate environment of a metallic nanoparticle probe its electronic structure. Compared to local calculations, the emission rate is significantly reduced. The influence is mostly pronounced if the emitter is located close to sharp edges. We suggest to use quantum emitters to test nonlocal effects in experimentally feasible configurations.

Filter, Robert; Toscano, Giuseppe; Lederer, Falk; Rockstuhl, Carsten

2014-01-01T23:59:59.000Z

212

Effect of isomers on quantum transport through molecular bridge system  

E-Print Network (OSTI)

Quantum transport for different models of isomer molecules attached to two semi-infinite leads is studied on the basis of Green's function technique. Electronic transport properties are significantly affected by (a) the relative position of the atoms in these molecules and (b) the molecule-to-lead coupling strength of these molecular bridge systems.

Santanu K. Maiti

2009-01-08T23:59:59.000Z

213

Noiseless Quantum Transmission of Information via Aharonov - Bohm Effect  

E-Print Network (OSTI)

The possibility of quantum transmission of information via the induced fractional angular momentum by the Aharonov - Bohm vector potential is revealed. Its special advantage is that it is noiseless: Stray magnetic fields of environments influence the energy spectrum of the ion, but cannot contribute the fractional angular momentum to cause noise.

Jian-Zu Zhang

2008-10-23T23:59:59.000Z

214

Colloidal Quantum Dot Photovoltaics: The Effect of Polydispersity David Zhitomirsky,,  

E-Print Network (OSTI)

, Ontario M5S 3G4, Canada Division of Physical Sciences and Engineering, Solar and Photo polydispersity. KEYWORDS: Energy landscaping, colloidal quantum dot, photovoltaics, solar cell, polydispersity diodes,4,5 and solar cells.6,7 At present, the most efficient CQD solar cells8 employ the depleted

215

Nuclear quantum effects in liquid water from an ab initio force matching approach  

E-Print Network (OSTI)

We have applied path integral simulations, in combination with new ab initio based water potentials, to investigate nuclear quantum effects in liquid water. Because direct ab initio path integral simulations are computationally expensive, a flexible water model is parameterized by force-matching to density functional theory-based molecular dynamics simulations. The resulting effective potentials provide an inexpensive replacement for direct \\textit{ab inito} molecular dynamics simulations and furthermore allow an efficient simulation of nuclear quantum effects. Static and dynamic properties of liquid water at ambient conditions are presented and the role of nuclear quantum effects, exchange-correlation functionals and dispersion corrections are discussed in regards to reproducing the experimental properties of liquid water.

Spura, Thomas; Habershon, Scott; Khne, Thomas D

2014-01-01T23:59:59.000Z

216

Quantum discord  

NLE Websites -- All DOE Office Websites (Extended Search)

Quantum discord Quantum discord 1663 Los Alamos science and technology magazine Latest Issue:November 2013 All Issues » submit Quantum discord A distinguishing aspect of quantum mechanics discovered at Los Alamos that may be critical to building a quantum computer March 25, 2013 Spinning coins turning into binary numbers Quantum computing Quantum computing can be carried out without the delicate entanglement of qubits previously believed to be necessary Quantum computing, in which quantum bits of information (or qubits) juggle a "superposition" of multiple values simultaneously, offers to unleash tremendous computational power if the qubits can be effectively isolated to prevent decoherence: information describing quantum states dispersing into the environment. But recent research has shown that quantum computing can be carried out

217

Simulation of quantum dots size and spacing effect for intermediate band solar cell application based on InAs quantum dots arrangement in GaAs  

SciTech Connect

Intermediate band solar cell (IBSC) has become a promising technology in increasing solar cell efficiency. In this work we compare absorption coefficient profile between InAs quantum dots with GaAs bulk. We calculate the efficiency of GaAs bulk and GaAs doped with 2, 5, and 10 nm InAs quantum dot. Effective distances in quantum dot arrangement based on electron tunneling consideration were also calculated. We presented a simple calculation method with low computing power demand. Results showed that arrangement of quantum dot InAs in GaAs can increase solar cell efficiency from 23.9 % initially up to 60.4%. The effective distance between two quantum dots was found 2 nm in order to give adequate distance to prevent electron tunneling and wave functions overlap.

Hendra, P. I. B., E-mail: ib.hendra@gmail.com; Rahayu, F., E-mail: ib.hendra@gmail.com; Darma, Y., E-mail: ib.hendra@gmail.com [Physical Vapor Deposition Laboratory, Physics of Material Electronics Research, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha 10, Bandung 40132 (Indonesia)

2014-03-24T23:59:59.000Z

218

Town Hall meeting | OpenEI Community  

Open Energy Info (EERE)

Town Hall meeting Town Hall meeting Home Graham7781's picture Submitted by Graham7781(1992) Super contributor 16 November, 2012 - 11:23 LEDS the focus of Monday's 10 a.m. Town Hall Meeting LEDS Town Hall meeting What: OpenEI's town hall meeting is a half-hour open forum for discussions on energy topics with NREL's OpenEI team. Find out how your fellow researchers, students, teachers and energy professionals are using energy data, maps and tools. Graham7781's picture Submitted by Graham7781(1992) Super contributor 19 September, 2012 - 13:40 Town Hall Meeting October 1st, 2012 OpenEI Town Hall meeting What: OpenEI's town hall meeting is a half-hour open forum for discussions on energy topics with NREL's OpenEI team. Find out how your fellow researchers, students, teachers and energy professionals are using energy

219

City Hall plazas : they're different  

E-Print Network (OSTI)

This essay explores the form, goals, and ideals behind city hall plazas by asking the questions: What is the difference between a city hall plaza and any other urban plaza? What are the uses intended by the city in the ...

Hall, Kristen E. (Kristen Elizabeth)

2008-01-01T23:59:59.000Z

220

Quantum theory of bilayer quantum Hall smectics Emiliano Papa,1  

E-Print Network (OSTI)

of charge-density and position along each stripe edge. The soft modes associated with the broken symmetries spontaneous interlayer phase coherence and a sizable charge gap even at relatively large layer separations in very high mobility bilayer systems at dilution refrigerator temperatures as a function of layer

Note: This page contains sample records for the topic "quantum hall effect" 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

Heat and mass transfer in rotating fluid with Hall current, II  

Science Journals Connector (OSTI)

Effects of Hall current on the hydromagnetic free-convection resulting from the combined effects of thermal and mass diffusion of an electrically conducting liquid past an infinite vertical porous plate in a r...

H. L. Agrawal; P. C. Ram; V. Singh

222

General Residence Hall Information General Information  

E-Print Network (OSTI)

/dining facilities. Air Conditioning All rooms in Susan Davis Hall are equipped with window air conditioning units

Sheridan, Jennifer

223

Generalized decoding, effective channels, and simplified security proofs in quantum key distribution  

SciTech Connect

Prepare and measure quantum key distribution protocols can be decomposed into two basic steps: delivery of the signals over a quantum channel and distillation of a secret key from the signal and measurement records by classical processing and public communication. Here we formalize the distillation process for a general protocol in a purely quantum-mechanical framework and demonstrate that it can be viewed as creating an 'effective' quantum channel between the legitimate users Alice and Bob. The process of secret key generation can then be viewed as entanglement distribution using this channel, which enables application of entanglement-based security proofs to essentially any prepare and measure protocol. To ensure secrecy of the key, Alice and Bob must be able to estimate the channel noise from errors in the key, and we further show how symmetries of the distillation process simplify this task. Applying this method, we prove the security of several key distribution protocols based on equiangular spherical codes.

Renes, Joseph M. [IAKS Prof. Beth, Arbeitsgruppe Quantum Computing, Universitaet Karlsruhe, Am Fasanengarten 5, D-76131 Karlsruhe (Germany); Quantum Information Theory Group, Institut fuer Theoretische Physik I, and Max-Planck-Forschungsgruppe, Institut fuer Optik, Information und Photonik, Universitaet Erlangen-Nuernberg, Staudtstrasse 7, D-91058 Erlangen (Germany); Grassl, Markus [IAKS Prof. Beth, Arbeitsgruppe Quantum Computing, Universitaet Karlsruhe, Am Fasanengarten 5, D-76131 Karlsruhe (Germany)

2006-08-15T23:59:59.000Z

224

Black hole fireworks: quantum-gravity effects outside the horizon spark black to white hole tunneling  

E-Print Network (OSTI)

We show that there is a classical metric satisfying the Einstein equations outside a finite spacetime region where matter collapses into a black hole and then emerges from a white hole. We compute this metric explicitly. We show how quantum theory determines the (long) time for the process to happen. A black hole can thus quantum-tunnel into a white hole. For this to happen, quantum gravity should affect the metric also in a small region outside the horizon: we show that contrary to what is commonly assumed, this is not forbidden by causality or by the semiclassical approximation, because quantum effects can pile up over a long time. This scenario alters radically the discussion on the black hole information puzzle.

Hal M. Haggard; Carlo Rovelli

2014-07-06T23:59:59.000Z

225

Effects of detector efficiency mismatch on security of quantum cryptosystems  

SciTech Connect

We suggest a type of attack on quantum cryptosystems that exploits variations in detector efficiency as a function of a control parameter accessible to an eavesdropper. With gated single-photon detectors, this control parameter can be the timing of the incoming pulse. When the eavesdropper sends short pulses using the appropriate timing so that the two gated detectors in Bob's setup have different efficiencies, the security of quantum key distribution can be compromised. Specifically, we show for the Bennett-Brassard 1984 (BB84) protocol that if the efficiency mismatch between 0 and 1 detectors for some value of the control parameter gets large enough (roughly 15:1 or larger), Eve can construct a successful faked-states attack causing a quantum bit error rate lower than 11%. We also derive a general security bound as a function of the detector sensitivity mismatch for the BB84 protocol. Experimental data for two different detectors are presented, and protection measures against this attack are discussed.

Makarov, Vadim [Department of Electronics and Telecommunications, Norwegian University of Science and Technology, NO-7491 Trondheim (Norway); Radiophysics Department, St. Petersburg State Polytechnic University, Politechnicheskaya street 29, 195251 St. Petersburg (Russian Federation); Anisimov, Andrey [Radiophysics Department, St. Petersburg State Polytechnic University, Politechnicheskaya street 29, 195251 St. Petersburg (Russian Federation); Skaar, Johannes [Department of Electronics and Telecommunications, Norwegian University of Science and Technology, NO-7491 Trondheim (Norway)

2006-08-15T23:59:59.000Z

226

Directions to Jordan Hall From San Francisco  

E-Print Network (OSTI)

Directions to Jordan Hall From San Francisco: · Take Highway 101 South. · Exit at Embarcadero Rd, underneath the placard that reads "Jordan Hall". From San Jose: · Take Highway 101 North. · Exit at the end of Palm Drive, underneath the placard that reads "Jordan Hall". From Oakland/East Bay: · Take

Grill-Spector, Kalanit

227

JORDAN HALL Directions from San Francisco  

E-Print Network (OSTI)

JORDAN HALL Directions from San Francisco · Take Highway 101 South. · Exit at Embarcadero Rd, underneath the placard that reads "Jordan Hall". Directions from San Jose · Take Highway 101 North. · Exit at the end of Palm Drive, underneath the placard that reads "Jordan Hall". Directions from Oakland/East Bay

Wagner, Anthony

228

Effect of laser phase noise on the fidelity of optomechanical quantum memory  

E-Print Network (OSTI)

Optomechanical and electromechanical cavities have been widely used in quantum memories and quantum transducers. We investigate theoretically the robustness of opto(electro)-mechanical quantum memories against the noise of the control laser. By solving the Langevin equations and using the covariance matrix formalism in the presence of laser noise effect, the storing fidelity of Gaussian states is obtained. It is shown that, the destructive effect of phase noise is more significant in higher values of coupling laser amplitude and optomechanical coupling strength G. However by further increasing of G, the interaction time between photons and phonons decreases below the coherence time of laser frequency noise and the destructive effect of laser phase noise on the storing fidelity decreases.

Farnaz Farman; Alireza Bahrampour

2015-01-18T23:59:59.000Z

229

Laboratory Study of Hall Reconnection in Partially Ionized Plasmas  

SciTech Connect

The effects of partial ionization (ni/nn ? 1%) on magnetic reconnection in the Hall regime have been studied systematically in the Magnetic Reconnection Experiment (MRX). It is shown that, when neutrals are added the Hall quadrupole field pattern and thus electron flow is unchanged while the ion outflow speed is reduced due to ion-neutral drag. However, in constrast to theoretical predictions, the ion diffusion layer width does not change appreciably. Therefore, the total ion outflow flux and the normalized reconnection rate are reduced.

Eric E. Lawrence, Hanto Ji, Masaaki Yamaada and Jongsoo Yoo

2012-05-15T23:59:59.000Z

230

Equality of bulk and edge Hall conductances for continuous magnetic random Schrdinger operators  

E-Print Network (OSTI)

In this note, we prove the equality of the quantum bulk and the edge Hall conductances in mobility edges and in presence of disorder. The bulk and edge perturbations can be either of electric or magnetic nature. The edge conductance is regularized in a suitable way to enable the Fermi level to lie in a region of localized states.

Amal Taarabt

2014-03-30T23:59:59.000Z

231

Type Specimens of Athyridid Brachiopods from the James Hall Collection  

E-Print Network (OSTI)

); Hall, 1857a, p. 94, fig. 3-4 and unnumbered; Hall, 1859b, p. 247; Hall, 1861, pl. 39. Meristella princeps (Hall, 1857a); Hall, 1860, p. 93, fig. 7; Hall, 1862, p. 180, fig. 7. Meristella laevis (Vanuxem, 1842); Miller, 1889, p. 354; Hall and Clarke... figured by Vanuxem. The well-preserved adult specimen figured by Hall (1861, pl. 39,3.1-n; see also, Hall, 1857a, p. 94, fig. 3-4 and unnumbered; 1857b, p. 54, p. 94, fig. 3-4 and unnumbered; 1860, p. 93, fig. 7; 1862, p. 180, fig. 7; Hall and Clarke, 1893...

Alvarez, Fernando; Brime, Covadonga

2000-03-15T23:59:59.000Z

232

Quantum Control by Imaging : The Zeno effect in an ultracold lattice gas  

E-Print Network (OSTI)

We demonstrate the control of quantum tunneling in an ultracold lattice gas by the measurement backaction imposed by an imaging process. A {\\em in situ} imaging technique is used to acquire repeated images of an ultracold gas confined in a shallow optical lattice. The backaction induced by these position measurements modifies the coherent quantum tunneling of atoms within the lattice. By smoothly varying the rate at which spatial information is extracted from the atomic ensemble, we observe the continuous crossover from the 'weak measurement regime' where position measurements have little influence on the tunneling dynamics, to the 'strong measurement regime' where measurement-induced localization causes a large suppression of tunneling. This suppression of coherent tunneling is a manifestation of the Quantum Zeno effect. Our study realizes an experimental demonstration of the paradigmatic Heisenberg microscope in a lattice gas and sheds light on the implications of quantum measurement on the coherent evolution of a mesoscopic quantum system. In addition, this demonstrates a powerful technique for the control of an interacting many-body quantum system via spatially resolved measurement backaction.

Y. S. Patil; S. Chakram; M. Vengalattore

2014-11-11T23:59:59.000Z

233

Anthony Kathryn Hall | Open Energy Information  

Open Energy Info (EERE)

Anthony Kathryn Hall Anthony Kathryn Hall Jump to: navigation, search Name Anthony & Kathryn Hall Place United Kingdom Sector Wind energy Product UK-based private wind farm in Highland. References Anthony & Kathryn Hall[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Anthony & Kathryn Hall is a company located in United Kingdom . References ↑ "Anthony & Kathryn Hall" Retrieved from "http://en.openei.org/w/index.php?title=Anthony_Kathryn_Hall&oldid=342207" Categories: Clean Energy Organizations Companies Organizations Stubs What links here Related changes Special pages Printable version Permanent link Browse properties 429 Throttled (bot load) Error 429 Throttled (bot load)

234

Optical Kerr and Cotton-Mouton effects in atomic gases: a quantum-statistical study  

E-Print Network (OSTI)

Theory of the birefringence of the refractive index in atomic diamagnetic dilute gases in the presence of static electric (optical Kerr effect) and magnetic (Cotton-Mouton effect) fields is formulated. Quantum-statistical expressions for the second Kerr and Cotton-Mouton virial coefficients, valid both in the low and high temperature regimes, are derived. It is shown that both virial coefficients can rigorously be related to the difference of the fourth derivatives of the thermodynamic (pressure) virial coefficient with respect to the strength of the non-resonant optical fields with parallel and perpendicular polarizations and with respect to the external static (electric or magnetic) field. Semiclassical expansions of the Kerr and Cotton-Mouton coefficients are also considered, and quantum corrections up to and including the second order are derived. Calculations of the second Kerr and Cotton-Mouton virial coefficients of the helium-4 gas at various temperatures are reported. The role of the quantum-mechanic...

Skomorowski, Wojciech

2013-01-01T23:59:59.000Z

235

Hybrid Quantum and Classical Methods for Computing Kinetic Isotope Effects of Chemical Reactions in Solution and in Enzymes  

E-Print Network (OSTI)

in Solution and in Enzymes Jiali Gao,*,a Dan T. Major, Yao Fan, Yen-lin Lin, Shuhua Ma, and Kin-Yiu Wong Isotope Effects, Enzyme Kinetics, and Solvent Effects. Abstract: A method for incorporating quantum mechanics into enzyme kinetics modeling is presented. Three aspects are emphasized: (1) combined quantum

Minnesota, University of

236

Quantum delocalization and correlation effects in one-dimensional chains of adsorbed hydrogen atoms  

E-Print Network (OSTI)

Quantum delocalization and correlation effects in one-dimensional chains of adsorbed hydrogen atoms adsorbed in the troughs of fcc(110) surfaces. Employing direct diagonalization of the Hamilton matrix. These vibronic states can be detected by measuring the vibrational spectra of adsorbed hydrogen atoms [13]. From

Pfeifer, Holger

237

Hybrid approach for including electronic and nuclear quantum effects in molecular dynamics simulations of hydrogen transfer  

E-Print Network (OSTI)

Hybrid approach for including electronic and nuclear quantum effects in molecular dynamics January 2001 A hybrid approach for simulating proton and hydride transfer reactions in enzymes coefficient and to investigate the real-time dynamics of reactive trajectories. This hybrid approach includes

Hammes-Schiffer, Sharon

238

Effect of Quantum Confinement on Thermoelectric Properties of 2D and 1D Semiconductor Thin Films  

E-Print Network (OSTI)

Effect of Quantum Confinement on Thermoelectric Properties of 2D and 1D Semiconductor Thin Films A. Bulusu and D. G. Walker1 Interdisciplinary Program in Material Science Vanderbilt University Nashville on device characteristics of 1D and 2D thin film superlattices whose applications include thermoelectric

Walker, D. Greg

239

Multiconfigurational nuclear-electronic orbital approach: Incorporation of nuclear quantum effects in electronic structure calculations  

E-Print Network (OSTI)

in electronic structure calculations Simon P. Webb, Tzvetelin Iordanov, and Sharon Hammes-Schiffera) Department 26 March 2002; accepted 30 May 2002 The nuclear-electronic orbital NEO method for the calculation are that nuclear quantum effects are incorporated during the electronic structure calculation, the Born

Hammes-Schiffer, Sharon

240

Quantum nuclear effects on the location of hydrogen above and below the palladium (100) surface  

E-Print Network (OSTI)

and absorption of hydrogen and its isotopes. Many studies [19­22], such as low energy electron diffraction (LEED, and thus have important implications in low temperature catalytic hydrogenation reactions [23­25Quantum nuclear effects on the location of hydrogen above and below the palladium (100) surface

Alavi, Ali

Note: This page contains sample records for the topic "quantum hall effect" 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

Isotope Effect on Adsorbed Quantum Phases: Diffusion of H2 and D2 in Nanoporous Carbon  

Quasielastic neutron scattering of H2 and D2 in the same nanoporous carbon at 1040 K demonstrates extreme quantum sieving, with D2 diffusing up to 76 times faster. D2 also shows liquidlike diffusion while H2 exhibits Chudley-Elliott jump diffusion, evidence of their different relationships with the local lattice of adsorption sites due to quantum effects on intermolecular interactions. The onset of diffusion occurs at 2225 K for H2 and 1013 K for D2. At these temperatures, H2 and D2 have identical thermal de Broglie wavelengths that correlate with the dominant pore size.

Contescu, Cristian I.; Zhang, Hongxin; Olsen, Raina J.; Mamontov, Eugene; Morris, James R.; Gallego, Nidia C.

2013-06-01T23:59:59.000Z

242

Sudden change in quantum and classical correlations and the Unruh effect  

SciTech Connect

We use the Unruh effect to analyze the dynamics of classical and quantum correlations for a two-qubit system when one of them is uniformly accelerated for a finite amount of proper time. We show that the quantum correlation is completely destroyed in the limit of infinite acceleration, while the classical one remains nonzero. In particular, we show that such correlations exhibit the so-called sudden-change behavior as a function of acceleration. Eventually, we discuss how our results can be interpreted when the system lies in the vicinity of the event horizon of a Schwarzschild black hole.

Celeri, L. C.; Serra, R. M. [Centro de Ciencias Naturais e Humanas, Universidade Federal do ABC, Rua Santa Adelia 166, 09210-170 Santo Andre, Sao Paulo (Brazil); Landulfo, A. G. S.; Matsas, G. E. A. [Instituto de Fisica Teorica, Universidade Estadual Paulista, Rua Dr. Bento Teobaldo Ferraz, 271-Bl. II, 01140-070 Sao Paulo, Sao Paulo (Brazil)

2010-06-15T23:59:59.000Z

243

Effect of shells on photoluminescence of aqueous CdTe quantum dots  

SciTech Connect

Graphical abstract: Size-tunable CdTe coated with several shells using an aqueous solution synthesis. CdTe/CdS/ZnS quantum dots exhibited high PL efficiency up to 80% which implies the promising applications for biomedical labeling. - Highlights: CdTe quantum dots were fabricated using an aqueous synthesis. CdS, ZnS, and CdS/ZnS shells were subsequently deposited on CdTe cores. Outer ZnS shells provide an efficient confinement of electron and hole inside the QDs. Inside CdS shells can reduce the strain on the QDs. Aqueous CdTe/CdS/ZnS QDs exhibited high stability and photoluminescence efficiency of 80%. - Abstract: CdTe cores with various sizes were fabricated in aqueous solutions. Inorganic shells including CdS, ZnS, and CdS/ZnS were subsequently deposited on the cores through a similar aqueous procedure to investigate the effect of shells on the photoluminescence properties of the cores. In the case of CdTe/CdS/ZnS quantum dots, the outer ZnS shell provides an efficient confinement of electron and hole wavefunctions inside the quantum dots, while the middle CdS shell sandwiched between the CdTe core and ZnS shell can be introduced to obviously reduce the strain on the quantum dots because the lattice parameters of CdS is situated at the intermediate-level between those of CdTe and ZnS. In comparison with CdTe/ZnS coreshell quantum dots, the as-prepared water-soluble CdTe/CdS/ZnS quantum dots in our case can exhibit high photochemical stability and photoluminescence efficiency up to 80% in an aqueous solution, which implies the promising applications in the field of biomedical labeling.

Yuan, Zhimin; Yang, Ping, E-mail: mse_yangp@ujn.edu.cn

2013-07-15T23:59:59.000Z

244

How to test the gauge-invariant non-local quantum dynamics of the Aharonov-Bohm effect  

E-Print Network (OSTI)

The gauge invariant non local quantum dynamics of the Aharonov-Bohm effect can be tested experimentally by measuring the instantaneous shift of the velocity distribution occurring when the particle passes by the flux line. It is shown that in relativistic quantum theory it is possible to measure the instantaneous velocity with accuracy sufficient to detect the change of the velocity distribution. In non relativistic quantum theory the instantaneous velocity can be measured to any desired accuracy.

T. Kaufherr

2014-11-11T23:59:59.000Z

245

Nuclear quantum effects in liquid water from path-integral simulations using an ab initio force matching approach  

E-Print Network (OSTI)

We have applied path integral simulations, in combination with new ab initio based water potentials, to investigate nuclear quantum effects in liquid water. Because direct ab initio path integral simulations are computationally expensive, a flexible water model is parameterized by force-matching to density functional theory-based molecular dynamics simulations. The resulting effective potentials provide an inexpensive replacement for direct ab inito molecular dynamics simulations and allow efficient simulation of nuclear quantum effects. Static and dynamic properties of liquid water at ambient conditions are presented and the role of nuclear quantum effects, exchange-correlation functionals and dispersion corrections are discussed in regards to reproducing the experimental properties of liquid water.

Thomas Spura; Christopher John; Scott Habershon; Thomas D. Khne

2014-02-06T23:59:59.000Z

246

Mesoscopic transport and interferometry with wave packets of ultracold atoms: Effects of quantum coherence and interactions  

SciTech Connect

We propose a way to simulate mesoscopic transport processes with counterpropagating wave packets of ultracold atoms in quasi-one-dimensional (1D) waveguides and show quantitative agreement with analytical results. The method allows the study of a broad range of transport processes at the level of individual modes, not possible in electronic systems. Typically suppressed effects of quantum coherence become manifest, along with the effects of tunable interactions, which can be used to develop a simpler type of sensitive atom interferometer.

Das, Kunal K. [Department of Physical Sciences, Kutztown University of Pennsylvania, Kutztown, Pennsylvania 19530 (United States)

2011-09-15T23:59:59.000Z

247

Aharonov-Casher and spin Hall effects in mesoscopic ring structures with strong spin-orbit interaction RID A-1315-2011 RID B-3617-2008  

E-Print Network (OSTI)

, College Station, Texas 77843-4242, USA 2Institute of Physics ASCR, Cukrovarnick? 10, 162 53 Praha 6, Czech Republic 3School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, United Kingdom #1;Received 4 September 2008; published 16...-ring geometries and outline the two methods used to calculate their transport properties. In Sec. III we confirm numerically analytical results22 for a single-channel ring embedded in a narrow quantum well. Section III A focuses on the consequences...

Borunda, M. F.; Liu, Xin; Kovalev, Alexey A.; Liu, Xiong-Jun; Jungwirth, T.; Sinova, Jairo.

2008-01-01T23:59:59.000Z

248

Electron-exchange effects on the charge capture process in degenerate quantum plasmas  

SciTech Connect

The electron-exchange effects on the charge capture process are investigated in degenerate quantum plasmas. The Bohr-Lindhard formalism with the effective interaction potential is employed to obtain the charge capture radius, capture probability, and capture cross section as functions of the impact parameter, projectile energy, electron-exchange parameter, Fermi energy, and plasmon energy. The result shows that the electron-exchange effect enhances the charge capture radius and the charge capture cross section in semiconductor quantum plasmas. It is also found that the charge capture radius and charge capture cross section increases with an increase of the Fermi energy and, however, decreases with increasing plasmon energy. Additionally, it is found that the peak position of the charge capture cross section is receded from the collision center with an increase of the electron-exchange parameter.

Jung, Young-Dae, E-mail: ydjung@hanyang.ac.kr [Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, 110 8th Street, Troy, New York 12180-3590 (United States) [Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, 110 8th Street, Troy, New York 12180-3590 (United States); Department of Applied Physics and Department of Bionanotechnology, Hanyang University, Ansan, Kyunggi-Do 426-791 (Korea, Republic of); Akbari-Moghanjoughi, M. [Azarbaijan Shahid Madani University, Faculty of Sciences, Department of Physics, 51745-406 Tabriz (Iran, Islamic Republic of) [Azarbaijan Shahid Madani University, Faculty of Sciences, Department of Physics, 51745-406 Tabriz (Iran, Islamic Republic of); International Centre for Advanced Studies in Physical Sciences and Institute for Theoretical Physics, Ruhr University Bochum, D-44780 Bochum (Germany)

2014-03-15T23:59:59.000Z

249

Hall viscosity from gauge/gravity duality  

E-Print Network (OSTI)

In (2+1)-dimensional systems with broken parity, there exists yet another transport coefficient, appearing at the same order as the shear viscosity in the hydrodynamic derivative expansion. In condensed matter physics, it is referred to as "Hall viscosity". We consider a simple holographic realization of a (2+1)-dimensional isotropic fluid with broken spatial parity. Using techniques of fluid/gravity correspondence, we uncover that the holographic fluid possesses a nonzero Hall viscosity, whose value only depends on the near-horizon region of the background. We also write down a Kubo's formula for the Hall viscosity. We confirm our results by directly computing the Hall viscosity using the formula.

Omid Saremi; Dam Thanh Son

2011-03-24T23:59:59.000Z

250

Building Green in Greensburg: City Hall Building  

Office of Energy Efficiency and Renewable Energy (EERE)

This poster highlights energy efficiency, renewable energy, and sustainable features of the high-performing City Hall building in Greensburg, Kansas.

251

Hypernuclei in Hall C | Jefferson Lab  

NLE Websites -- All DOE Office Websites (Extended Search)

Hypernuclei in Hall C High Resolution Electron Spectrometer The High Resolution Electron Spectrometer (teal and red, top left) was recently built with a grant from Japan's Ministry...

252

Relativistic Gravity and Non-Relativistic Effective Field Theories  

E-Print Network (OSTI)

There has been great interest recently in formulating non-relativistic effective field theories in a general coordinate invariant way. We show that relativistic gravity theories can offer such a framework. We focus on the parity violating case in 2+1 dimensions which is particularly appropriate for the study on quantum Hall effects and chiral superfluids. We discuss how the non-relativistic spacetime structure emerges from relativistic gravity. We present covariant maps and constraints that relate the field contents in the two theories, which also serve as holographic dictionary in context of gauge/gravity duality. A low energy effective action for fractional quantum Hall states is constructed and captures universal geometric properties and generates non-universal corrections systematically. We give another holographic example with dyonic black brane background to calculate thermodynamic and transport properties of strongly coupled non-relativistic fluids in magnetic field. Our formalism has a good projection...

Wu, Chaolun

2014-01-01T23:59:59.000Z

253

Bystander effect and adaptive response in C3H 10TK cells S. A. MITCHELL, S. A. MARINO, D. J. BRENNER and E. J. HALL  

E-Print Network (OSTI)

the bystander effect, adaptive response, genomic instabil- ity and low-dose hyper-radiosensitivity. These pheno

254

arXiv:1004.1985v1[cond-mat.mes-hall]12Apr2010 Current correlations of an on-demand electron source as an  

E-Print Network (OSTI)

arXiv:1004.1985v1[cond-mat.mes-hall]12Apr2010 Current correlations of an on-demand electron source to characterize an on-demand electron source consisting of a quantum dot connected to a conductor via a tunable of the electron emission time, which we call quantum jitter. In optimum op- erating conditions of the source

Plaçais, Bernard

255

Concept for Reducing Hall Thruster Chamber Wall Erosion with...  

NLE Websites -- All DOE Office Websites (Extended Search)

Concept for Reducing Hall Thruster Chamber Wall Erosion with Lithium Vapor Shielding. Hall thrusters have been established as a compact and reliable means for satellite...

256

Town Hall with Secretary Moniz and Deputy Secretary Sherwood...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Town Hall with Secretary Moniz and Deputy Secretary Sherwood-Randall Town Hall with Secretary Moniz and Deputy Secretary Sherwood-Randall Please join Secretary of Energy Ernest...

257

Town Hall with Secretary Moniz  

SciTech Connect

In a town hall meeting with Department staff, Energy Secretary Ernest Moniz spoke about his plans for a reorganization of the Energy Departments management structure. The plans will help better achieve the Departments key priorities and those of the President, including implementing the Presidents Climate Action Plan, all of the above energy strategy and nuclear security agenda. After his remarks, Moniz, joined by Deputy Secretary Dan Poneman, took questions from the audience in the Forrestal Auditorium as well as email questions from other Department locations.

Energy Secretary Ernest Moniz; Deputy Secretary of Energy Daniel Poneman

2013-07-18T23:59:59.000Z

258

Town Hall with Secretary Moniz  

ScienceCinema (OSTI)

In a town hall meeting with Department staff, Energy Secretary Ernest Moniz spoke about his plans for a reorganization of the Energy Department?s management structure. The plans will help better achieve the Department?s key priorities and those of the President, including implementing the President?s Climate Action Plan, ?all of the above? energy strategy and nuclear security agenda. After his remarks, Moniz, joined by Deputy Secretary Dan Poneman, took questions from the audience in the Forrestal Auditorium as well as email questions from other Department locations.

Energy Secretary Ernest Moniz; Deputy Secretary of Energy Daniel Poneman

2013-07-25T23:59:59.000Z

259

Micromagnetic study of auto-oscillation modes in spin-Hall nano-oscillators  

SciTech Connect

We present a numerical study of magnetization dynamics in a recently introduced spin torque nano-oscillator, whose operational principle relies on the spin-Hall effectspin-Hall nano-oscillators. Our numerical results show good agreement with the experimentally observed behaviors and provide detailed information about the features of the primary auto-oscillation mode observed in the experiments. They also clarify the physical nature of the secondary auto-oscillation mode, which was experimentally observed under certain conditions only.

Ulrichs, H., E-mail: henning.ulrichs@uni-muenster.de; Demidov, V. E.; Demokritov, S. O. [Department of Physics and Center for Nonlinear Science, University of Mnster, Corrensstrae 2-4, 48149 Mnster (Germany)

2014-01-27T23:59:59.000Z

260

UTEPBioinformaticsProgram Bell Hall, Room 138  

E-Print Network (OSTI)

UTEPBioinformaticsProgram Bell Hall, Room 138 The University of Texas at El Paso El Paso, TX 79968:www.bioinformatics.utep.edu UTEPBioinformatics BellHall,Room138 TheUniversityofTexasatElPaso 500W.UniversityAvenue ElPaso,TX79968 and Student Fitness Center with its two swimming pools underline the University's commitment to provide

Fuentes, Olac

Note: This page contains sample records for the topic "quantum hall effect" 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

OpenEI Community - Town Hall meeting  

Open Energy Info (EERE)

http://en.openei.org/community Town Hall Meeting October 1st, 2012 http://en.openei.org/community Town Hall Meeting October 1st, 2012 http://en.openei.org/community/blog/town-hall-meeting-october-1st-2012  

What: OpenEI's town hall meeting is a half-hour open forum for discussions on energy topics with NREL's OpenEI team. Find out how your fellow researchers, students, teachers and energy professionals are using energy data, maps and tools.hall-meeting-october-1st-2012" target="_blank">read more

262

Scanning Hall Probe Microscopy of Magnetic Vortices inVery Underdoped yttrium-barium-copper-oxide  

SciTech Connect

Since their discovery by Bednorz and Mueller (1986), high-temperature cuprate superconductors have been the subject of intense experimental research and theoretical work. Despite this large-scale effort, agreement on the mechanism of high-T{sub c} has not been reached. Many theories make their strongest predictions for underdoped superconductors with very low superfluid density n{sub s}/m*. For this dissertation I implemented a scanning Hall probe microscope and used it to study magnetic vortices in newly available single crystals of very underdoped YBa{sub 2}Cu{sub 3}O{sub 6+x} (Liang et al. 1998, 2002). These studies have disproved a promising theory of spin-charge separation, measured the apparent vortex size (an upper bound on the penetration depth {lambda}{sub ab}), and revealed an intriguing phenomenon of ''split'' vortices. Scanning Hall probe microscopy is a non-invasive and direct method for magnetic field imaging. It is one of the few techniques capable of submicron spatial resolution coupled with sub-{Phi}{sub 0} (flux quantum) sensitivity, and it operates over a wide temperature range. Chapter 2 introduces the variable temperature scanning microscope and discusses the scanning Hall probe set-up and scanner characterizations. Chapter 3 details my fabrication of submicron GaAs/AlGaAs Hall probes and discusses noise studies for a range of probe sizes, which suggest that sub-100 nm probes could be made without compromising flux sensitivity. The subsequent chapters detail scanning Hall probe (and SQUID) microscopy studies of very underdoped YBa{sub 2}Cu{sub 3}O{sub 6+x} crystals with T{sub c} {le} 15 K. Chapter 4 describes two experimental tests for visons, essential excitations of a spin-charge separation theory proposed by Senthil and Fisher (2000, 2001b). We searched for predicted hc/e vortices (Wynn et al. 2001) and a vortex memory effect (Bonn et al. 2001) with null results, placing upper bounds on the vison energy inconsistent with the theory. Chapter 5 discusses imaging of isolated vortices as a function of T{sub c}. Vortex images were fit with theoretical magnetic field profiles in order to extract the apparent vortex size. The data for the lowest T{sub c}'s (5 and 6.5 K) show some inhomogeneity and suggest that {lambda}{sub ab} might be larger than predicted by the T{sub c} {proportional_to} n{sub s}(0)/m* relation first suggested by results of Uemura et al. (1989) for underdoped cuprates. Finally, Chapter 6 examines observations of apparent ''partial vortices'' in the crystals. My studies of these features indicate that they are likely split pancake vortex stacks. Qualitatively, these split stacks reveal information about pinning and anisotropy in the samples. Collectively these magnetic imaging studies deepen our knowledge of cuprate superconductivity, especially in the important regime of low superfluid density.

Guikema, Janice Wynn; /SLAC, SSRL

2005-12-02T23:59:59.000Z

263

Quantum Zeno effect and the impact of flavor in leptogenesis  

E-Print Network (OSTI)

In thermal leptogenesis, the cosmic matter-antimatter asymmetry is produced by CP violation in the decays N --> l + \\Phi of heavy right-handed Majorana neutrinos N into ordinary leptons l and Higgs particles \\Phi. If some charged-lepton Yukawa couplings are in equilibrium during the leptogenesis epoch, the l interactions with the background medium are flavor sensitive and the coherence of their flavor content defined by N --> l+\\Phi is destroyed, modifying the efficiency of the inverse decays. We point out, however, that it is not enough that the flavor-sensitive processes are fast on the cosmic expansion time scale, they must be fast relative to the N l +\\Phi reactions lest the flavor amplitudes of l remain frozen by the repeated N l+\\Phi ``measurements''. Our more restrictive requirement is significant in the most interesting ``strong wash-out case'' where N l +\\Phi is fast relative to the cosmic expansion rate. We derive conditions for the unflavored treatment to be adequate and for flavor effects to be...

Blanchet, S; Raffelt, G G

2006-01-01T23:59:59.000Z

264

Some aspects of achieving an ultimate accuracy during insertion device magnetic measurements by a Hall probe  

SciTech Connect

An extensive test of a new Senis 2-axis Hall probe was done at the Advanced Photon Source using the Undulator A device and calibration system. This new probe has clear advantages compared with previously used Bell and Sentron Hall probes: very stable zero offset (less than the noise of 0.026 G) and compensated planar Hall effect. It can be used with proper calibration even for first and second field integral measurements. A comparison with reference measurements by long stretched coil shows that the difference in the first field integral measurement results for a 2.4-m-long Undulator A device is between 17 G cm for the best of four Hall probes used for the test and 51 G cm for the worst of them for all gap ranges from 10.5 mm to 150 mm.

Vasserman, I. B.; Xu, J. Z. [Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439 (United States); Strelnikov, N. O. [Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439 (United States); Budker Institute of Nuclear Physics, Novosibirsk 630090 (Russian Federation)

2013-02-15T23:59:59.000Z

265

Positioning effects on quantum dot solar cells grown by molecular beam epitaxy  

SciTech Connect

We report current-voltage and spectral response characteristics of high density InAs/GaAs quantum dot (QD) solar cells with different positions where dots are located. The short circuit current density (J{sub sc}), open circuit voltage (V{sub oc}), and external quantum efficiency of these cells under air mass 1.5 are presented and compared with a GaAs reference cell. An extended photoresponse in contrast to the GaAs reference cell was confirmed for all these cells. The effect of inserting QD layers into emitter and base region on device performance is shown. The J{sub sc} is reduced, while the V{sub oc} is maintained. The cell with QDs located toward the base side shows better performance, confirmed by both current-voltage and spectral response measurements.

Zhou, D.; Sharma, G.; Fimland, B. O. [Department of Electronics and Telecommunications, Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim (Norway); Vullum, P. E.; Thomassen, S. F.; Holmestad, R.; Reenaas, T. W. [Department of Physics, Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim (Norway)

2010-02-22T23:59:59.000Z

266

Nuclear quantum effects in water exchange around lithium and fluoride ions  

E-Print Network (OSTI)

We employ classical and ring polymer molecular dynamics simulations to study the effect of nuclear quantum fluctuations on the structure and the water exchange dynamics of aqueous solutions of lithium and fluoride ions. While we obtain reasonably good agreement with experimental data for solutions of lithium by augmenting the Coulombic interactions between the ion and the water molecules with a standard Lennard-Jones ion-oxygen potential, the same is not true for solutions of fluoride, for which we find that a potential with a softer repulsive wall gives much better agreement. A small degree of destabilization of the first hydration shell is found in quantum simulations of both ions when compared with classical simulations, with the shell becoming less sharply defined and the mean residence time of the water molecules in the shell decreasing. In line with these modest differences, we find that the mechanisms of the exchange processes are unaffected by quantization, so a classical description of these reaction...

Wilkins, David M; Dang, Liem X

2015-01-01T23:59:59.000Z

267

Strong carrier localization and diminished quantum-confined Stark effect in ultra-thin high-indium-content InGaN quantum wells with violet light emission  

SciTech Connect

Here, we report on the optical and structural characteristics of violet-light-emitting, ultra-thin, high-Indium-content (UTHI) InGaN/GaN multiple quantum wells (MQWs), and of conventional low-In-content MQWs, which both emit at similar emission energies though having different well thicknesses and In compositions. The spatial inhomogeneity of In content, and the potential fluctuation in high-efficiency UTHI MQWs were compared to those in the conventional low-In-content MQWs. We conclude that the UTHI InGaN MQWs are a promising structure for achieving better quantum efficiency in the visible and near-ultraviolet spectral range, owing to their strong carrier localization and reduced quantum-confined Stark effect.

Ko, Suk-Min; Kwack, Ho-Sang; Park, Chunghyun; Yoo, Yang-Seok; Cho, Yong-Hoon, E-mail: yhc@kaist.ac.kr [Department of Physics and KI for the NanoCentury, Korea Advanced Institute of Science and Technology, Daejeon 305-701 (Korea, Republic of)] [Department of Physics and KI for the NanoCentury, Korea Advanced Institute of Science and Technology, Daejeon 305-701 (Korea, Republic of); Kwon, Soon-Yong [Department of Materials Science and Engineering, Seoul National University, Seoul 151-744 (Korea, Republic of) [Department of Materials Science and Engineering, Seoul National University, Seoul 151-744 (Korea, Republic of); School of Mechanical and Advanced Materials Engineering, Ulsan National Institute of Science and Technology, Ulsan 689-798 (Korea, Republic of); Jin Kim, Hee; Yoon, Euijoon, E-mail: eyoon@snu.ac.kr [Department of Materials Science and Engineering, Seoul National University, Seoul 151-744 (Korea, Republic of)] [Department of Materials Science and Engineering, Seoul National University, Seoul 151-744 (Korea, Republic of); Si Dang, Le [Nanophysics and Semiconductors, CEA-CNRS-UJF Group, Institut Nel, CNRS Grenoble, 25 rue des Martyrs, 38042 Grenoble Cedex 9 (France)] [Nanophysics and Semiconductors, CEA-CNRS-UJF Group, Institut Nel, CNRS Grenoble, 25 rue des Martyrs, 38042 Grenoble Cedex 9 (France)

2013-11-25T23:59:59.000Z

268

Thermal vibration of a rectangular single-layered graphene sheet with quantum effects  

SciTech Connect

The thermal vibration of a rectangular single-layered graphene sheet is investigated by using a rectangular nonlocal elastic plate model with quantum effects taken into account when the law of energy equipartition is unreliable. The relation between the temperature and the Root of Mean Squared (RMS) amplitude of vibration at any point of the rectangular single-layered graphene sheet in simply supported case is derived first from the rectangular nonlocal elastic plate model with the strain gradient of the second order taken into consideration so as to characterize the effect of microstructure of the graphene sheet. Then, the RMS amplitude of thermal vibration of a rectangular single-layered graphene sheet simply supported on an elastic foundation is derived. The study shows that the RMS amplitude of the rectangular single-layered graphene sheet predicted from the quantum theory is lower than that predicted from the law of energy equipartition. The maximal relative difference of RMS amplitude of thermal vibration appears at the sheet corners. The microstructure of the graphene sheet has a little effect on the thermal vibrations of lower modes, but exhibits an obvious effect on the thermal vibrations of higher modes. The quantum effect is more important for the thermal vibration of higher modes in the case of smaller sides and lower temperature. The relative difference of maximal RMS amplitude of thermal vibration of a rectangular single-layered graphene sheet decreases monotonically with an increase of temperature. The absolute difference of maximal RMS amplitude of thermal vibration of a rectangular single-layered graphene sheet increases slowly with the rising of Winkler foundation modulus.

Wang, Lifeng, E-mail: walfe@nuaa.edu.cn; Hu, Haiyan [State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, 210016 Nanjing (China)

2014-06-21T23:59:59.000Z

269

New Residence Hall Siena College East and West Elevation  

E-Print Network (OSTI)

Dining hall can be divided into thirds with partitions Environmental High efficiency boilers Low flow

270

37A-Acad. Advising 62-Adams Hall  

E-Print Network (OSTI)

Gym 51-Still Hall 08-Stevenson Towers S 09-Stevenson Towers N Key Offices 61- Admissions--Williston 48 & Dining Services-Nept. 61-International Students-Williston 61-Registration & Records-Williston 62-Testing-Williston Hall 57-Wirtz Hall 27-Zulaug Hall Student Center #12;

Karonis, Nicholas T.

271

Special Feature: Quantum Measurement Standards  

Science Journals Connector (OSTI)

This special feature is intended to present a comprehensive review of the present state and novel trends in the field of quantum measurement standards. Most of the present metrological research is concentrated on establishing and strengthening the links between the units and fundamental constants. This will be demonstrated in the nine articles in this feature. The first four articles are devoted to time, frequency and length metrology. They describe quantum standards that are used or intended to be used for the realization of the SI base units of time and length, the second and the metre. The two units are related to each other by an adopted fixed value of the speed of light in vacuum and the second is at present defined by the energy difference (frequency) of a hyperfine transition in the ground state of caesium. The special feature starts with the discussion of caesium atomic clocks as direct realizations of the second and as a basis for other standards (e.g. the Josephson voltage quantum standard). Whereas Cs atomic clocks still provide us with the most accurate realization of the second, optical frequency standards based on cold trapped ions or cold atoms may eventually lead us to even lower uncertainty levels and may replace the present definition of the second by an optical transition. This situation is described in the contribution on optical frequency standards based on trapped single ions. Since optical frequency standards are also needed as wavelength standards in length metrology, the third contribution reviews the definition of the metre. It describes the different methods of realization, in particular by optical frequency standards including standards based on cold atoms. The use of optical frequency standards in time and length metrology requires the precise knowledge of their frequencies. Methods of optical frequency measurements based on various methodsincluding frequency comb generatorsare discussed in the fourth article. Turning to the electric units, the discovery of two macroscopic quantum effects, the Josephson effectdiscovered in the early sixtiesand the quantum Hall effectdiscovered in 1980allowed the linking of electric units to fundamental constants. By use of the Josephson effect quantized voltage values are realized as multiples of the product of a certain frequency and of the superconducting flux quantum (h/2e). Quantized resistance values are realized with the quantum Hall effect as submultiples of h/e2, where this fundamental constant can also be interpreted as the quotient of the flux quantum of a normal conductor and the elementary charge. The metrological application became much easier by making use of the possibility of designing and manufacturing appropriate samples with microelectronic techniques. Since 1990 all calibrations of voltages or resistances worldwide have been based on these two quantum effects. Relative uncertainties of the order of 10-9 are obtained. International comparisons have proved that the calibration results in different laboratories also agree within relative uncertainties of a few parts in 109. Great attempts have also been made to realize a current quantum standard by counting single electrons. The Josephson effect and its application are described by Kohlmann and co-workers. The quantum Hall effect is only briefly described in this issue of Measurement Science and Technology since a comprehensive review article by Jeckelmann and Jeanneret appeared recently [1]. The unit of mass, the kilogram, is the only base unit in the SI that is derived from an artefact. Therefore one major task of today's metrological research is the linking of the unit of mass to a fundamental constant. There are two rival attempts: the comparison of mechanical and electrical power using the watt-balance and the counting of a large number of identical particles, like atoms or ions. The watt balance was pioneered by B Kibble. This experiment consists of two parts. A balance in equilibrium is opposed to a gravitational force and to a force on a coil fed by a current and opp

Erich Braun; Jrgen Helmcke

2003-01-01T23:59:59.000Z

272

Intermittency in Hall-magnetohydrodynamics with a strong guide field  

SciTech Connect

We present a detailed study of intermittency in the velocity and magnetic field fluctuations of compressible Hall-magnetohydrodynamic turbulence with an external guide field. To solve the equations numerically, a reduced model valid when a strong guide field is present is used. Different values for the ion skin depth are considered in the simulations. The resulting data are analyzed computing field increments in several directions perpendicular to the guide field, and building structure functions and probability density functions. In the magnetohydrodynamic limit, we recover the usual results with the magnetic field being more intermittent than the velocity field. In the presence of the Hall effect, field fluctuations at scales smaller than the ion skin depth show a substantial decrease in the level of intermittency, with close to monofractal scaling.

Rodriguez Imazio, P.; Martin, L. N.; Dmitruk, P. [Departamento de Fsica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires and IFIBA, CONICET, Buenos Aires 1428 (Argentina)] [Departamento de Fsica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires and IFIBA, CONICET, Buenos Aires 1428 (Argentina); Mininni, P. D. [Departamento de Fsica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires and IFIBA, CONICET, Buenos Aires 1428 (Argentina) [Departamento de Fsica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires and IFIBA, CONICET, Buenos Aires 1428 (Argentina); National Center for Atmospheric Research, P.O. Box 3000, Boulder, Colorado 80307 (United States)

2013-05-15T23:59:59.000Z

273

Device convolution effects on the collective scattering signal of the E Multiplication-Sign B mode from Hall thruster experiments: 2D dispersion relation  

SciTech Connect

The effect of the collective light scattering diagnostic transfer function is considered in the context of the dispersion relation of the unstable E Multiplication-Sign B mode previously reported. This transfer function is found to have a contribution to the measured frequencies and mode amplitudes which is more or less significant depending on the measurement wavenumbers and angles. After deconvolution, the experimental data are found to be possibly compatible with the idea that the mode frequency in the jet frame (after subtraction of the Doppler effect due to the plasma motion along the thruster axis) is independent of the orientation of the wave vector in the plane orthogonal to the local magnetic field.

Cavalier, J.; Lemoine, N.; Bonhomme, G. [IJL, Universite de Lorraine, CNRS (UMR 7198), BP 70239, 54506 Vandoeuvre-les-Nancy (France); Tsikata, S. [ICARE, CNRS (UPR 3021), 1C av. de la Recherche Scientifique, 45071 Orleans (France); Honore, C.; Gresillon, D. [LPP, CNRS (UMR 7648), Ecole Polytechnique, 91128 Palaiseau (France)

2012-08-15T23:59:59.000Z

274

Effect of phase noise on quantum correlations in Bose-Josephson junctions  

SciTech Connect

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

275

Charge Hall effect driven by spin-dependent chemical potential gradients and Onsager relations in mesoscopic systems RID B-8398-2011 RID A-7392-2009  

E-Print Network (OSTI)

&M University, College Station, Texas 77843-4242, USA 2Department of Physics, The University of Hong-Kong, Pukfulam Road, Hong-Kong, China 3Institute of Physics ASCR, Cukrovarnick? 10, 162 53 Praha 6, Czech Republic 4School of Physics and Astronomy... on two-dimensional hole gas #1;2DHG#2; #1;Al,Ga#2;As. Although the experiment by Wunderlich et al. seems to be in the regime where the intrinsic effect in 2DHG is dominant, the main theoretical focus has been concen- trated so far on 2DEG with Rashba...

Hankiewicz, EM; Li, J.; Jungwirth, T.; Niu, Q.; Shen, SQ; Sinova, Jairo.

2005-01-01T23:59:59.000Z

276

Gluonic Excitations and Experimental Hall-D at Jefferson Lab  

E-Print Network (OSTI)

A new tagged photon beam facility is being constructed in experimental Hall-D at Jefferson Lab as a part of the 12 GeV upgrade program. The 9 GeV linearly-polarized photon beam will be produced via coherent Bremsstrahlung using the CEBAF electron beam, incident on a diamond radiator. The GlueX experiment in Hall-D will use this photon beam to search for and study the pattern of gluonic excitations in the meson spectrum produced through photoproduction reactions with a liquid hydrogen target. Recent lattice QCD calculations predict a rich spectrum of hybrid mesons, that are formed by exciting the gluonic field that couples the quarks. A subset of these hybrid mesons are predicted to have exotic quantum numbers which cannot be formed from a simple $q\\bar{q}$ pair, and thus provide an ideal laboratory for testing QCD in the confinement regime. In these proceedings the status of the construction and installation of the GlueX detector will be presented, in addition to simulation results for some reactions of interest in hybrid meson searches.

Justin R. Stevens

2014-07-01T23:59:59.000Z

277

On low energy quantum gravity induced effects on the propagation of light  

E-Print Network (OSTI)

Present models describing the interaction of quantum Maxwell and gravitational fields predict a breakdown of Lorentz invariance and a non standard dispersion relation in the semiclassical approximation. Comparison with observational data however, does not support their predictions. In this work we introduce a different set of ab initio assumptions in the canonical approach, namely that the homogeneous Maxwell equations are valid in the semiclassical approximation, and find that the resulting field equations are Lorentz invariant in the semiclassical limit. We also include a phenomenological analysis of possible effects on the propagation of light, and their dependence on energy, in a cosmological context.

Reinaldo J. Gleiser; Carlos N. Kozameh; Florencia Parisi

2003-04-11T23:59:59.000Z

278

Transport Anomalies and Marginal-Fermi-Liquid Effects at a Quantum Critical Point  

Science Journals Connector (OSTI)

The conductivity and the tunneling density of states of disordered itinerant electrons in the vicinity of a ferromagnetic transition at low temperature are discussed. Critical fluctuations lead to nonanalytic frequency and temperature dependencies that are distinct from the usual long-time tail effects in a disordered Fermi liquid. The crossover between these two types of behavior is proposed as an experimental check of recent theories of the quantum ferromagnetic critical behavior. In addition, the quasiparticle properties at criticality are shown to be those of a marginal Fermi liquid.

D. Belitz; T. R. Kirkpatrick; R. Narayanan; Thomas Vojta

2000-11-20T23:59:59.000Z

279

Quantum-limited phase-matching effect in a {Lambda}-type laser system  

SciTech Connect

The theory of a quantum-limited phase-matching effect in a {Lambda}-type lasing system is studied in detail based on the quantum Langevin approach. Two quasimonochromatic fields are directly generated based on two lasing transitions. We find that the coherence between two lasers can well exceed the linewidth of either laser field. This result denotes that two field phases match each other although either laser field has a high phase fluctuation. Unlike the phase-matching effect based on atomic absorption, the final coherence between two laser fields here is not limited by saturation broadening, and the higher laser intensities lead to a higher coherence. Additionally, based on a linear stability analysis, we find that the instability of the field steady state can substantially restrict the occurrence of this phase-matching effect in the bad-cavity limit for a high pump rate. We also discuss the spectrum of amplitude fluctuations of output fields, and the result shows that the squeezing of amplitude fluctuations at low frequencies for a single field oscillating inside the cavity is damaged in the case of two fields oscillating.

Yu Deshui [Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-8656 (Japan); Chen Jingbiao [Institute of Quantum Electronics, and State Key Laboratory of Advanced Optical Communication System and Network, School of Electronics Engineering and Computer Science, Peking University, Beijing 100871 (China)

2011-06-15T23:59:59.000Z

280

Building Green in Greensburg: City Hall Building  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

City Hall Building City Hall Building Destroyed in the tornado, City Hall was completed in October 2009 and built to achieve the U.S. Green Building Council's Leadership in Energy and Environmental Design (LEED ® ) Platinum designation. The 4,700-square-foot building serves as a symbol of Greensburg's vitality and leadership in becoming a sustainable community where social, environmental, and economic concerns are held in balance. It houses the City's administrative offices and council chambers, and serves as a gathering place for town meetings and municipal court sessions. According to energy analysis modeling results, the new City Hall building is 38% more energy efficient than an ASHRAE-compliant building of the same size and shape. ENERGY EFFICIENCY FEATURES * A well-insulated building envelope with an

Note: This page contains sample records for the topic "quantum hall effect" 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

Clean Cities: Clean Cities Hall of Fame  

NLE Websites -- All DOE Office Websites (Extended Search)

Hall of Fame Hall of Fame U.S. Department of Energy Clean Cities Hall of Fame logo The Clean Cities Hall of Fame recognizes outstanding contributions to the Clean Cities mission of reducing petroleum dependency in U.S. transportation. Inductees are ambassadors for alternative fuels and champions for fuel economy. Their exemplary dedication and leadership are paving the way for a new transportation future. 2013 Inductees 2012 Inductees Photo of Yvonne Anderson Yvonne Anderson Central Oklahoma Clean Cities Photo of Rita Ebert Rita Ebert Greater Long Island Clean Cities Coalition Photo of Richard Battersby Richard Battersby East Bay Clean Cities Photo of Lee Grannis Lee Grannis New Haven Clean Cities 2011 Inductees Photo of Colleen Crowninshield Colleen Crowninshield Tucson Clean Cities Coalition

282

Lees-Kubota Lecture Hall, Guggenheim 101  

NLE Websites -- All DOE Office Websites (Extended Search)

November 3 rd Lees-Kubota Lecture Hall, Guggenheim 101 11:15am-12:15pm "Perovskite Solar Cells: Towards New Materials and New Applications" Professor Nripan Mathews Nanyang...

283

Pioneer Hall 615 Fulton Street SE  

E-Print Network (OSTI)

Pioneer Hall 615 Fulton Street SE Minneapolis, MN 55455 Office: 612.626.3333 pioneer if documented for violating a housing policy if their finals are completed. Turn off all lights and unplug

Janssen, Michel

284

Steric, Quantum, and Electrostatic Effects on SN2 Reaction Barriers in Gas Phase  

SciTech Connect

Biomolecular nucleophilic substitution reactions, S{sub N}2, are fundamental and commonplace in chemistry. It is the well-documented experimental finding in the literature that vicinal substitution with bulkier groups near the reaction center significantly slows the reaction due to steric hindrance, but theoretical understanding in the quantitative manner about factors dictating the S{sub N}2 reaction barrier height is still controversial. In this work, employing the new quantification approach that we recently proposed for the steric effect from the density functional theory framework, we investigate the relative contribution of three independent effectssteric, electrostatic, and quantumto the S{sub N}2 barrier heights in gas phase for substituted methyl halide systems, R{sub 1}R{sub 2}R{sub 3}CX, reacting with the fluorine anion, where R{sub 1}, R{sub 2}, and R{sub 3} denote substituting groups and X = F or Cl. We found that in accordance with the experimental finding, for these systems, the steric effect dominates the transition state barrier, contributing positively to barrier heights, but this contribution is largely compensated by the negative, stabilizing contribution from the quantum effect due to the exchange-correlation interactions. Moreover, we find that it is the component from the electrostatic effect that is linearly correlated with the S{sub N}2 barrier height for the systems investigated in the present study. In addition, we compared our approach with the conventional method of energy decomposition in density functional theory as well as examined the steric effect from the wave function theory for these systems via natural bond orbital analysis.

Liu, Shubin; Hu, Hao; Pedersen, Lee G.

2010-01-01T23:59:59.000Z

285

Scanning Hall probe microscopy of a diluted magnetic semiconductor  

SciTech Connect

We have measured the micromagnetic properties of a diluted magnetic semiconductor as a function of temperature and applied field with a scanning Hall probe microscope built in our laboratory. The design philosophy for this microscope and some details are described. The samples analyzed in this work are Ga{sub 0.94}Mn{sub 0.06}As films grown by molecular beam epitaxy. We find that the magnetic domains are 2-4 mum wide and fairly stable with temperature. Magnetic clusters are observed above T{sub C}, which we ascribe to MnAs defects too small and sparse to be detected by a superconducting quantum interference device magnetometer.

Kweon, Seongsoo [Materials Science and Engineering, University of Texas at Austin, Austin, Texas 78712 (United States); Samarth, Nitin [Physics Department, Penn State University, University Park, Pennsylvania 16802 (United States); Lozanne, Alex de [Materials Science and Engineering, University of Texas at Austin, Austin, Texas 78712 (United States); Department of Physics, University of Texas at Austin, Austin, Texas 78712 (United States)

2009-05-01T23:59:59.000Z

286

Enhancement of fusion rates due to quantum effects in the particles momentum distribution in nonideal media  

E-Print Network (OSTI)

This study concerns a situation when measurements of the nonresonant cross-section of nuclear reactions appear highly dependent on the environment in which the particles interact. An appealing example discussed in the paper is the interaction of a deuteron beam with a target of deuterated metal Ta. In these experiments, the reaction cross section for d(d,p)t was shown to be orders of magnitude greater than what the conventional model predicts for the low-energy particles. In this paper we take into account the influence of quantum effects due to the Heisenberg uncertainty principle for particles in a non-ideal medium elastically interacting with the medium particles. In order to calculate the nuclear reaction rate in the non-ideal environment we apply both the Monte Carlo technique and approximate analytical calculation of the Feynman diagram using nonrelativistic kinetic Green's functions in the medium which correspond to the generalized energy and momentum distribution functions of interacting particles. We show a possibility to reduce the 12-fold integral corresponding to this diagram to a fivefold integral. This can significantly speed up the computation and control accuracy. Our calculations show that quantum effects significantly influence reaction rates such as p +7Be, 3He +4He, p +7Li, and 12C +12C. The new reaction rates may be much higher than the classical ones for the interior of the Sun and supernova stars. The possibility to observe the theoretical predictions under laboratory conditions is discussed.

N. J. Fisch; M. G. Gladush; Yu. V. Petrushevich; Piero Quarati; A. N. Starostin

2011-10-16T23:59:59.000Z

287

Effect of a magnetic field on the excitonic luminescence line shape in a quantum well  

Science Journals Connector (OSTI)

The effect of magnetic field on the excitonic photoluminescence line shape has been studied in a high-quality single GaAs-AlxGa1-xAs quantum well grown by the molecular-beam-epitaxy technique. An increase of magnetic field from 0 to 6 T has been found to result in (1) a decrease in the Lorentzian contribution ?0 to the line shape from ?0(0 T)=0.5040.01 meV to ?0(6 T)=0.3360.01 meV due to the formation of a quasi-zero-dimensional density of states. This leads, in turn, to an increase in the exciton dephasing time due to the inhibition of the carrier relaxation, and (2) an increase in the Gaussian contribution from ?(0 T)=0.24 meV to ?(6 T)=0.39 meV, attributed to the shrinking of the exciton wave function in real space; the last effect causing the exciton to become more responsive to the statistical potential fluctuations at the quantum-well interfaces.

I. Aksenov; J. Kusano; Y. Aoyagi; T. Sugano; T. Yasuda; Y. Segawa

1995-02-15T23:59:59.000Z

288

Spin hall effect in paramagnetic thin films  

E-Print Network (OSTI)

the principle of Light Emitting Diode, but changed the design to a coplanar structure with two p-n junctions. A Light-Emitting Diode [27] consists of a chip of semiconductor materials doped with impurities to create a p-n junction. When the LED is forward... the principle of Light Emitting Diode, but changed the design to a coplanar structure with two p-n junctions. A Light-Emitting Diode [27] consists of a chip of semiconductor materials doped with impurities to create a p-n junction. When the LED is forward...

Xu, Huachun

2009-05-15T23:59:59.000Z

289

MagLab - Hall Effect Tutorial  

NLE Websites -- All DOE Office Websites (Extended Search)

version of Java. Electrical currents are affected by magnetic fields. When a magnetic field is applied perpendicular to the flow of current, the field causes resistance in the...

290

Observation of a superfluid Hall effect  

Science Journals Connector (OSTI)

...action of the magnet on electric currents . Am J Math 2 : 287 292...P Gomila D ( 2007 ) Elementary excitations of...condensed-matter physics. When an electric current flows perpendicular...of the conventional resistance. For strongly...Cold Temperature Electric Conductivity Electrons...

Lindsay J. LeBlanc; Karina Jimnez-Garca; Ross A. Williams; Matthew C. Beeler; Abigail R. Perry; William D. Phillips; Ian B. Spielman

2012-01-01T23:59:59.000Z

291

Ionized-impurity scattering of quasi-two-dimensional quantum-confined carriers  

Science Journals Connector (OSTI)

Hall-effect measurements of electron mobility in anti-modulation-doped GaAs/AlGaAs quantum wells indicate that the ionized-impurity scattering of a quasi-two-dimensional electron gas immersed in the identical concentration of ionized impurities is greater than that of a bulk electron gas of the same density. This enhancement results from an increase of the overlap of the electronic wave function with the impurities, a decrease in screening, and an increase in large-angle scattering. The enhanced scattering rate may be further increased by confining the dopant ions to a deltalike doping profile in the center of the well.

W. Ted Masselink

1991-03-18T23:59:59.000Z

292

Local dissipation effects in two-dimensional quantum Josephson junction arrays with a magnetic field  

SciTech Connect

We study the quantum phase transitions in two-dimensional arrays of Josephson-couples junctions with short range Josephson couplings (given by the Josephson energy E{sub J}) and the charging energy E{sub C}. We map the problem onto the solvable quantum generalization of the spherical model that improves over the mean-field theory method. The arrays are placed on the top of a two-dimensional electron gas separated by an insulator. We include effects of the local dissipation in the presence of an external magnetic flux f={phi}/{phi}{sub 0} in square lattice for several rational fluxes f=0,(1/2),(1/3),(1/4), and (1/6). We also have examined the T=0 superconducting-insulator phase boundary as a function of a dissipation {alpha}{sub 0} for two different geometry of the lattice: square and triangular. We have found a critical value of the dissipation parameter independent on geometry of the lattice and presence magnetic field.

Polak, T.P.; Kopec, T.K. [Max-Planck-Institut fuer Physik komplexer Systeme, Noethnitzer Strasse 38, 01187 Dresden (Germany); Institute for Low Temperatures and Structure Research, Polish Academy of Sciences, POB 1410, 50-950 Wroclaw 2 (Poland)

2005-07-01T23:59:59.000Z

293

Physics Reports 355 (2001) 235334 Quantum phase transitions and vortex dynamics in  

E-Print Network (OSTI)

Contents 1. Introduction 237 1.1. Josephson-junction arrays 237 1.2. Phase-number relation 238 1.3. Structure of the review 239 2. Quantum phase transitions 240 2.1. The model of a Josephson-junction array currents 313 4.2. The quantum Hall e ect 316 4.3. Quantum computation with Josephson junctions 317

294

Blinking effect and the use of quantum dots in single molecule spectroscopy  

SciTech Connect

Highlights: Black-Right-Pointing-Pointer It is possible to eliminate the blinking effect of a water-soluble QD. Black-Right-Pointing-Pointer We provide a direct method to study protein function and dynamics at the single level. Black-Right-Pointing-Pointer QD, potent tool for single molecule studies of biochemical and biological processes. -- Abstract: Luminescent semiconductor nanocrystals (quantum dots, QD) have unique photo-physical properties: high photostability, brightness and narrow size-tunable fluorescence spectra. Due to their unique properties, QD-based single molecule studies have become increasingly more popular during the last years. However QDs show a strong blinking effect (random and intermittent light emission), which may limit their use in single molecule fluorescence studies. QD blinking has been widely studied and some hypotheses have been done to explain this effect. Here we summarise what is known about the blinking effect in QDs, how this phenomenon may affect single molecule studies and, on the other hand, how the 'on'/'off' states can be exploited in diverse experimental settings. In addition, we present results showing that site-directed binding of QD to cysteine residues of proteins reduces the blinking effect. This option opens a new possibility of using QDs to study protein-protein interactions and dynamics by single molecule fluorescence without modifying the chemical composition of the solution or the QD surface.

Rombach-Riegraf, Verena; Oswald, Peter; Bienert, Roland; Petersen, Jan [Albert-Ludwigs-Universitaet Freiburg, Institut fuer Physikalische Chemie, Albertstrasse 23a, 79104 Freiburg (Germany)] [Albert-Ludwigs-Universitaet Freiburg, Institut fuer Physikalische Chemie, Albertstrasse 23a, 79104 Freiburg (Germany); Domingo, M.P. [Instituto de Carboquimica (CSIC), Miguel Luesma 4, 50018 Zaragoza (Spain)] [Instituto de Carboquimica (CSIC), Miguel Luesma 4, 50018 Zaragoza (Spain); Pardo, Julian [Grupo Apoptosis, Inmunidad y Cancer, Departamento Bioquimica y Biologia Molecular y Celular, Fac. Ciencias, Universidad de Zaragoza, Zaragoza (Spain) [Grupo Apoptosis, Inmunidad y Cancer, Departamento Bioquimica y Biologia Molecular y Celular, Fac. Ciencias, Universidad de Zaragoza, Zaragoza (Spain); Fundacion Aragon I-D (ARAID), Gobierno de Aragon, Zaragoza (Spain); Immune Effector Cells Group, Aragon Health Research Institute (IIS Aragon), Biomedical Research Centre of Aragon (CIBA) Fundacion Aragon I-D - ARAID, Gobierno de Aragon, Zaragoza (Spain); Graeber, P. [Albert-Ludwigs-Universitaet Freiburg, Institut fuer Physikalische Chemie, Albertstrasse 23a, 79104 Freiburg (Germany)] [Albert-Ludwigs-Universitaet Freiburg, Institut fuer Physikalische Chemie, Albertstrasse 23a, 79104 Freiburg (Germany); Galvez, E.M., E-mail: eva@icb.csic.es [Instituto de Carboquimica (CSIC), Miguel Luesma 4, 50018 Zaragoza (Spain); Immune Effector Cells Group, Aragon Health Research Institute (IIS Aragon), Biomedical Research Centre of Aragon (CIBA) Fundacion Aragon I-D - ARAID, Gobierno de Aragon, Zaragoza (Spain)

2013-01-04T23:59:59.000Z

295

The Quantum Side of Photosynthesis  

Science Journals Connector (OSTI)

The Quantum Side of Photosynthesis ... But evidence is mounting that photosynthetic organisms may, in fact, capitalize on quantum effects to harness the suns rays. ...

JYLLIAN KEMSLEY

2012-02-19T23:59:59.000Z

296

Henderson Hall's Education and Career Fair | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Hall's Education and Career Fair September 25, 2014 2:00PM to 5:00PM EDT Location: Smith Gym, Henderson Hall, Arlington, VA POC: Donna Friend Website: http:www.mccshh.com...

297

EXTENDING CHARACTERS FROM HALL SUBGROUPS GUNTER MALLE AND GABRIEL NAVARRO  

E-Print Network (OSTI)

EXTENDING CHARACTERS FROM HALL SUBGROUPS GUNTER MALLE AND GABRIEL NAVARRO Abstract. Suppose that G AND GABRIEL NAVARRO Lemma 2.1. Suppose that G is -separable and let H be a Hall -subgroup of G. Let L G

Malle, Gunter

298

Magnetic-field effects on quasi-two-dimensional excitons in coupled GaAs?(Ga,Al)As quantum wells  

Science Journals Connector (OSTI)

We have used the variational procedure in the effective-mass and nondegenerate parabolic band approximations in order to investigate the effects of a magnetic field on the exciton effective mass and dispersion in semiconductor heterostructures. Calculations are performed for bulk GaAs, and two-dimensional and quasi-two-dimensional excitons in coupled GaAs?(Ga,Al)As quantum wells for applied magnetic fields perpendicular to the layers. A simple hydrogenlike envelope wave function provides the expected behavior for the exciton dispersion in a wide range of the center-of-mass momenta, and an analytical expression for the exciton effective mass is obtained. Present results lead to a magnetic-field dependent exciton effective mass and dispersion in quite good agreement with available experimental measurements in coupled GaAs?(Ga,Al)As quantum wells.

E. Reyes-Gmez, L. E. Oliveira, and M. de Dios-Leyva

2005-01-14T23:59:59.000Z

299

Deck Those Halls! | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Deck Those Halls! Deck Those Halls! Deck Those Halls! December 14, 2010 - 2:24pm Addthis Drew Bittner Web Manager, Office of Energy Efficiency and Renewable Energy It's mid-December, so odds are good you've already decorated your home for the holidays. If so, you're ahead of me; it took us about three days to get the lights on the tree and we still have items to put up at home, not to mention lots of Christmas cards to send out. My point is, many of us are pressed for time in this holiday season. Between braving the stores to shop for gifts, attending parties, digging out winter clothing (and seeing whether it still fits) and so forth, there's not an awful lot of extra time left to think about things like...are the lights on my tree really energy efficient? If you're using LEDs, the answer is an emphatic YES! LEDs are very

300

Town Hall Meeting | OpenEI Community  

Open Energy Info (EERE)

Town Hall Meeting Town Hall Meeting Home > Groups > Utility Rate Rmckeel's picture Submitted by Rmckeel(297) Contributor 12 June, 2012 - 09:01 Do you want to be more connected with the OpenEI community? Announcing a weekly, public telecon with the OpenEI community at large! Find out how your fellow researchers, students, teachers and energy professionals are using OpenEI, and let us know what needs to change! When: Occurs every Monday 11:30 AM - 12:00 PM (GMT-07:00) Mountain Time, holidays excluded Please use the following information to call in to this meeting: 866-459-9997 #9645075 Town hall default agenda: 30 minutes 5 mins brief introductions - name, company, potential icebreaker (what's your favorite analysis tool, programming language, energy sector..) 5 minutes OpenEI: what's new and coming soon

Note: This page contains sample records for the topic "quantum hall effect" 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

Deck Those Halls! | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Deck Those Halls! Deck Those Halls! Deck Those Halls! December 14, 2010 - 2:24pm Addthis Drew Bittner Web Manager, Office of Energy Efficiency and Renewable Energy It's mid-December, so odds are good you've already decorated your home for the holidays. If so, you're ahead of me; it took us about three days to get the lights on the tree and we still have items to put up at home, not to mention lots of Christmas cards to send out. My point is, many of us are pressed for time in this holiday season. Between braving the stores to shop for gifts, attending parties, digging out winter clothing (and seeing whether it still fits) and so forth, there's not an awful lot of extra time left to think about things like...are the lights on my tree really energy efficient? If you're using LEDs, the answer is an emphatic YES! LEDs are very

302

Josephson effect in CeCoIn{sub 5} microbridges as seen via quantum interferometry  

SciTech Connect

A superconducting quantum interference device (SQUID) was prepared on a micron-sized single crystal using a selected growth domain of a thin film of CeCoIn{sub 5} grown by molecular beam epitaxy. SQUID voltage oscillations of good quality were obtained as well as interference effects stemming from the individual Josephson microbridges. The transport characteristics in the superconducting state exhibited several peculiarities which we ascribe to the periodic motion of vortices in the microbridges. The temperature dependence of the Josephson critical current shows good correspondence to the Ambegaokar-Baratoff relation, expected for the ideal Josephson junction. The results indicate a promising pathway to identify the type of order parameter in CeCoIn{sub 5} by means of phase-sensitive measurements on microbridges.

Foyevtsov, Oleksandr; Porrati, Fabrizio; Huth, Michael [Physikalisches Institut, Goethe University, Frankfurt am Main, 60438 (Germany)

2011-07-15T23:59:59.000Z

303

Suspending Effect on Low-Frequency Charge Noise in Graphene Quantum Dot  

E-Print Network (OSTI)

Charge noise is critical in the performance of gate-controlled quantum dots (QDs). Here we show the 1/f noise for a microscopic graphene QD is substantially larger than that for a macroscopic graphene field-effect transistor (FET), increasing linearly with temperature. To understand its origin, we suspended the graphene QD above the substrate. In contrast to large area graphene FETs, we find that a suspended graphene QD has an almost-identical noise level as an unsuspended one. Tracking noise levels around the Coulomb blockade peak as a function of gate voltage yields potential fluctuations of order 1 "{\\mu}eV", almost one order larger than in GaAs/GaAlAs QDs. Edge states rather than substrate-induced disorders, appear to dominate the 1/f noise, thus affecting the coherency of graphene nano-devices.

Xiang-Xiang Song; Hai-Ou Li; Jie You; Tian-Yi Han; Gang Cao; Tao Tu; Ming Xiao; Guang-Can Guo; Hong-Wen Jiang; Guo-Ping Guo

2014-06-16T23:59:59.000Z

304

Theory of substrate, Zeeman, and electron-phonon interaction effects on the quantum capacitance in graphene  

SciTech Connect

Since the discovery of graphene, a lot of interest has been attracted by the zeroth Landau level, which has no analog in the conventional two dimensional electron gas. Recently, lifting of the spin and valley degeneracies has been confirmed experimentally by capacitance measurements, while in transport experiments, this is difficult due to the scattering in the device. In this context, we model interaction effects on the quantum capacitance of graphene in the presence of a perpendicular magnetic field, finding good agreement with experiments. We demonstrate that the valley degeneracy is lifted by the substrate and by Kekule distortion, whereas the spin degeneracy is lifted by Zeeman interaction. The two cases can be distinguished by capacitance measurements.

Tahir, M. [PSE Division, KAUST, Thuwal 23955-6900 (Saudi Arabia); Department of Physics, University of Sargodha, Sargodha 40100 (Pakistan); Sabeeh, K. [Department of Physics, Quaid-i-Azam University, Islamabad 45320 (Pakistan); Shaukat, A. [Department of Physics, University of Sargodha, Sargodha 40100 (Pakistan); Schwingenschlgl, U., E-mail: Udo.Schwingenschlogl@kaust.edu.sa [PSE Division, KAUST, Thuwal 23955-6900 (Saudi Arabia)

2013-12-14T23:59:59.000Z

305

Limits to Quantum Gravity Effects from Observations of TeV Flares in Active Galaxies  

E-Print Network (OSTI)

We have used data from the TeV gamma-ray flare associated with the active galaxy Markarian 421 observed on 15 May 1996 to place bounds on the possible energy-dependence of the speed of light in the context of an effective quantum gravitational energy scale. The possibility of an observable time dispersion in high energy radiation has recently received attention in the literature, with some suggestions that the relevant energy scale could be less than the Planck mass and perhaps as low as 10^16 GeV. The limits derived here indicate this energy scale to be in excess of 4x10^16 GeV at the 95% confidence level. To the best of our knowledge, this constitutes the first convincing limit on such phenomena in this energy regime.

S. D. Biller; A. C. Breslin; J. Buckley; M. Catanese; M. Carson; D. A. Carter-Lewis; M. F. Cawley; D. J. Fegan; J. Finley; J. A. Gaidos; A. M. Hillas; F. Krennrich; R. C. Lamb; R. Lessard; C. Masterson; J. E. McEnery; B. McKernan; P. Moriarty; J. Quinn; H. J. Rose; F. Samuelson; G. Sembroski; P. Skelton; T. C. Weekes

1998-10-13T23:59:59.000Z

306

The current density in quantum electrodynamics in time-dependent external potentials and the Schwinger effect  

E-Print Network (OSTI)

In the framework of quantum electrodynamics (QED) in external potentials, we introduce a method to compute the time-dependence of the expectation value of the current density for time-dependent homogeneous external electric fields. We apply it to the so-called Sauter pulse. For late times, our results agree with the asymptotic value due to electron-positron pair production. For sub-critical peak field strengths, or results agree very well with the general expression derived by Serber for the linearization in the external field. In particular, the expectation value of the current density at intermediate times can be much greater than at asymptotic times. We comment on consequences of these findings for recent proposals to test the Schwinger effect with high intensity lasers using processes at intermediate times.

Zahn, Jochen

2015-01-01T23:59:59.000Z

307

Nuclear Quantum Effects and Nonlocal Exchange-Correlation Functionals Applied to Liquid Hydrogen at High Pressure  

Science Journals Connector (OSTI)

Using first-principles molecular dynamics, we study the influence of nuclear quantum effects (NQEs) and nonlocal exchange-correlation density functionals (DFs) near molecular dissociation in liquid hydrogen. NQEs strongly influence intramolecular properties, such as bond stability, and are thus an essential part of the dissociation process. Moreover, by including DFs that account for either the self-interaction error or dispersion interactions, we find a much better description of molecular dissociation and metallization than previous studies based on classical protons and/or local or semilocal DFs. We obtain excellent agreement with experimentally measured optical properties along Hugoniot curves for precompressed states, and while we still find a first-order liquid-liquid transition at low temperatures, transition pressures are increased by more than 100GPa.

Miguel A. Morales, Jeffrey M. McMahon, Carlo Pierleoni, and David M. Ceperley

2013-02-05T23:59:59.000Z

308

Near-infrared induced optical quenching effects on mid-infrared quantum cascade lasers  

SciTech Connect

In space communications, atmospheric absorption and Rayleigh scattering are the dominant channel impairments. Transmission using mid-infrared (MIR) wavelengths offers the benefits of lower loss and less scintillation effects. In this work, we report the telecom wavelengths (1.55??m and 1.3??m) induced optical quenching effects on MIR quantum cascade lasers (QCLs), when QCLs are operated well above their thresholds. The QCL output power can be near 100% quenched using 20?mW of near-infrared (NIR) power, and the quenching effect depends on the input NIR intensity as well as wavelength. Time resolved measurement was conducted to explore the quenching mechanism. The measured recovery time is around 14?ns, which indicates that NIR generated electron-hole pairs may play a key role in the quenching process. The photocarrier created local field and band bending can effectively deteriorate the dipole transition matrix element and quench the QCL. As a result, MIR QCLs can be used as an optical modulator and switch controlled by NIR lasers. They can also be used as converters to convert telecom optical signals into MIR optical signals.

Guo, Dingkai, E-mail: dingk1@umbc.edu; Talukder, Muhammad Anisuzzaman; Chen, Xing [Department of Computer Science and Electrical Engineering, University of Maryland, Baltimore County, 1000 Hilltop Circle, Baltimore, Maryland 21250 (United States); Cai, Hong [Center of Advanced Studies in Photonics Research (CASPR), University of Maryland, Baltimore County, 1000 Hilltop Circle, Baltimore, Maryland 21250 (United States); Johnson, Anthony M.; Choa, Fow-Sen [Department of Computer Science and Electrical Engineering, University of Maryland, Baltimore County, 1000 Hilltop Circle, Baltimore, Maryland 21250 (United States); Center of Advanced Studies in Photonics Research (CASPR), University of Maryland, Baltimore County, 1000 Hilltop Circle, Baltimore, Maryland 21250 (United States); Khurgin, Jacob B. [Department of Electrical and Computer Engineering, Johns Hopkins University, Baltimore, Maryland 21218 (United States)

2014-06-23T23:59:59.000Z

309

Effect of atomic scale plasticity on hydrogen diffusion in iron: Quantum mechanically informed and on-the-fly kinetic  

E-Print Network (OSTI)

viewpoints, is futile. Among several mechanisms proposed for hydrogen embrittlement (HE) of metals, hydrogenEffect of atomic scale plasticity on hydrogen diffusion in iron: Quantum mechanically informed-assisted diffusion and trapping of hydrogen by crystalline defects in iron. Given an embedded atom (EAM) potential

Ortiz, Michael

310

Introduction Hall and Tank (2005) present estimates of ecosystem metab-  

E-Print Network (OSTI)

213 Introduction Hall and Tank (2005) present estimates of ecosystem metab- olism for Giltner in the estimation of ecosystem metabolism by open-channel methods (McCutchan et al. 2002; Hall and Tank 2005). To estimate metabolism in Giltner Spring Creek, Hall and Tank (2005) employ a mass-balance equation

Lewis Jr., William M.

311

Contract Periods for 2012-2013 Residence Halls  

E-Print Network (OSTI)

Contract Periods for 2012-2013 Residence Halls All of the residence halls are on Fall/Spring Contracts. THERE IS NO FALL ONLY CONTRACT. · The residence halls open for the fall semester on September 1 rate for the number of days they stay. Apartments Your contract entitles you to an apartment space

Minnesota, University of

312

Tunable fractional quantum Hall phases in bilayer graphene  

NLE Websites -- All DOE Office Websites (Extended Search)

Coulomb interactions drive the existence of a correlated many-body state. Bilayer graphene represents a particularly interesting material in which to study the fractional...

313

Spin and Valley Quantum Hall Ferromagnetism in Graphene  

NLE Websites -- All DOE Office Websites (Extended Search)

potential for symmetry breaking phases. In our experiment, we used Landau levels in graphene to study the breaking of SU(4) symmetry-a higher dimensional analog of the symmetry...

314

Scaling in the quantum Hall regime of graphene Corbino devices  

SciTech Connect

The scaling behavior of graphene devices in Corbino geometry was investigated through temperature dependent conductivity measurements under magnetic field. Evaluation of the Landau level width as a function of temperature yielded a relatively low temperature exponent of ??=?0.16??0.05. Furthermore, an unusually large value close to 7.6??0.9 was found for the universal scaling constant ?, while the determined inelastic scattering exponent of p?=?2 is consistent with established scattering mechanisms in graphene. The deviation of the scaling parameters from values characteristic of conventional two-dimensional electron gases is attributed to an inhomogeneous charge carrier distribution in the Corbino devices. Direct evidence for the presence of the latter could be gained by spatially resolved photocurrent microscopy away from the charge neutrality point of the devices.

Peters, Eva C.; Burghard, Marko [Max-Planck Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart (Germany); Giesbers, A. J. M. [Max-Planck Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart (Germany); Molecular Materials and Nanosystems, Eindhoven University of Technology, NL-5600 MB Eindhoven (Netherlands); Kern, Klaus [Max-Planck Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart (Germany); Institut de Physique de la Matire Condense, Ecole Polytechnique Fdrale de Lausanne, CH-1015 Lausanne (Switzerland)

2014-05-19T23:59:59.000Z

315

Quantum Hall States of Gluons in Quark Matter  

Science Journals Connector (OSTI)

......Particle and Nuclear Studies, High Energy Accelerator Research Organization...Japan Savvidy vacuum of SU(2...modes in the vacuum condense to...Particle and Nuclear Studies, High Energy Accelerator Research Organization...Savvidy vacuum of SU(2......

Aiichi Iwazaki; Osamu Morimatsu; Tetsuo Nishikawa; Munehisa Ohtani

2004-01-01T23:59:59.000Z

316

Hall coefficient and angle-resolved photoemission in systems with strong pair fluctuations  

Science Journals Connector (OSTI)

We examine the normal-state temperature and doping dependence of the Hall coefficient in the context of a pair-fluctuation scenario, based on a model where itinerant electrons are hybridized with localized electron pairs via a charge exchange term. We show that an anomalous behavior of the Hall effect, qualitatively similar to that observed in high-Tc superconductors, can be attributed to the non-Fermi-liquid properties of the single-particle spectral function that exhibits pseudogap features. Our calculations are based on a dynamical mean-field procedure that relates the transport coefficients to the single-particle spectral function in an exact way.

Alfonso Romano and Julius Ranninger

2000-08-01T23:59:59.000Z

317

Quantum effects in the early Universe. IV. Nonlocal effects in particle production in anisotropic models  

Science Journals Connector (OSTI)

The dynamical equation governing the evolution of the effective geometry in the presence of the production of conformally invariant scalar particles is solved for a homogeneous model cosmology with small anisotropy and classical radiation. The pair-production probabilities and spectrum are calculated in the one-loop approximation to lowest nonvanishing order in the deviation from exact isotropy.

James B. Hartle

1980-10-15T23:59:59.000Z

318

Forensic Entomology & Taphonomy Smith Hall Room 125  

E-Print Network (OSTI)

ENTM 295T Forensic Entomology & Taphonomy Smith Hall Room 125 Monday 8:30 ­ 11:20 a.m. Fall and on the postmortem fate of human remains. Ralph Williams, Ph.D. D-ABFE Professor of Entomology Entomology, Smith B9

Ginzel, Matthew

319

Daniel B Reeves 6127 Wilder Hall  

E-Print Network (OSTI)

Daniel B Reeves 6127 Wilder Hall Hanover, NH 03755 609-577-6477 dbr@dartmouth.edu ! EDUCATION · Intermediate French language GRANTS AND AWARDS Visionaries in technology poster award Neukom Fellowship 2013--year long computational science grant providing tuition, research funds and stipend. GAAN Fellowship

320

Integrated Learning Centre Beamish-Munro Hall  

E-Print Network (OSTI)

. Beamish-Munro Hall is a green building. It has a rating equiva- lent to LEED silver,received a 2005 Award at the 2005 Sustainable Buildings Conference in Tokyo. quick FACT LOGIN On our computers,select AD to complement the classroom experience,enhancing de- sign,team and professional skills development. For Students

Linder, Tamás

Note: This page contains sample records for the topic "quantum hall effect" 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

DINING HALL CATERING TENDER SCOPE OF WORK  

E-Print Network (OSTI)

Facilities creating a pleasing ambience and student-friendly dining environment 4. FOOD SERVICE REQUIREMENTS movements and activities, and preferences. 2. Project Definition The University requires the Service Provider to provide the Services at the following Catering Facilities: a. Main Dining Hall (Students' Union

Wagner, Stephan

322

Old Main Library Shih-Liang Hall  

E-Print Network (OSTI)

Library Shih-Liang Hall Computer and Information Networking Center Audio-Visual Educational Center College of Engineering Bldg. E.E. Bldg. No. 2 Graduate Institute of National Development Graduate of Management Dept. of Engineering Science and Ocean Engineering Dept. of Horticultural Science Dept.ofCivilEngineering

Wu, Yih-Min

323

Campus and Residential Services Broomhurst Hall Handbook  

E-Print Network (OSTI)

Campus and Residential Services Broomhurst Hall Handbook 2011 ­ 2012 #12;1 WELCOME We offer you a good year. Walter Cairns Lyn Dodd Warden Services Manager September 2011 This Handbook supplements your. This list does not contain all of the Terms and reading it should not replace a careful review of the actual

324

Plasma relaxation and topological aspects in Hall magnetohydrodynamics  

SciTech Connect

Parker's formulation of isotopological plasma relaxation process in magnetohydrodynamics (MHD) is extended to Hall MHD. The torsion coefficient {alpha} in the Hall MHD Beltrami condition turns out now to be proportional to the potential vorticity. The Hall MHD Beltrami condition becomes equivalent to the potential vorticity conservation equation in two-dimensional (2D) hydrodynamics if the Hall MHD Lagrange multiplier {beta} is taken to be proportional to the potential vorticity as well. The winding pattern of the magnetic field lines in Hall MHD then appears to evolve in the same way as potential vorticity lines in 2D hydrodynamics.

Shivamoggi, B. K. [University of Central Florida, Orlando, Florida 32816-1364 (United States)

2012-07-15T23:59:59.000Z

325

Dr. Kanarek 8/9/2011 175 Science Hall 1;00-2:15 Tu, Th  

E-Print Network (OSTI)

Sept 8 History of air pollution problem -- The Disasters Tu Sept 13 Risk Assessment (Concepts of Health Th Oct 20 Ozone Health Effects Tu Oct 25 EXAM I Th Oct 27Indoor Air Pollution Overview #12;Tu Nov 1Dr. Kanarek 8/9/2011 175 Science Hall 1;00-2:15 Tu, Th PHS/Env St 502: Air Pollution and Human

Sheridan, Jennifer

326

MONDAY, JANUARY 28, 2008 16:00 -16:30 Opening Ceremony Hall A, Herods Forum  

E-Print Network (OSTI)

THE EFFECT OF GLOBAL CLIMATE CHANGE ON CORALS REEFS: BLEACHING AND SKELETON LOSS 19:15 M. Horowitz, Hebrew:30 Parallel Session A-3: microRNA - from plants to humans in development, health and disease Hall D, Dan. Mandelboim, Hebrew University - Hadassah Medical School VIRAL AND HUMAN microRNAs USE SHARED TARGET SEQUENCES

Shamir, Ron

327

Anomalous quantum and isotope effects in water clusters: Physical phenomenon, model artifact, or bad approximation?  

E-Print Network (OSTI)

Free energy differences $\\Delta F:=F-F_{\\text{prism}}$ are computed for several isomers of water hexamer relative to the "prism" isomer using the self-consistent phonons method. %$\\Delta F:=F-F({prism})$ We consider the isotope effect defined by the quantity $\\delta F_{D_2O}:=\\Delta F_{\\rm D_2O}-\\Delta F_{\\rm H_2O}$, and the quantum effect, $\\delta F_{\\hbar=0}:=\\Delta F_{\\hbar=0}-\\Delta F_{\\rm H_2O}$, and evaluate them using different flexible water models. While both $\\delta F_{D_2O}$ and $\\delta F_{\\hbar=0}$ are found to be rather small for all of the potentials, they are especially small for two of the empirical models, q-TIP4P/F and TTM3-F, compared to q-SPC/Fw and the two {\\it abinitio}-based models, WHBB and HBB2-pol. This qualitative difference in the properties of different water models cannot be explained by one being "more accurate" than the other. We speculate as to whether the observed anomalies are caused by the special properties of water systems, or are an artifact of either the potential energ...

Brown, Sandra E

2014-01-01T23:59:59.000Z

328

Effects of internal fields on deep-level emission in InGaN/GaN quantum-well light-emitting diodes  

Science Journals Connector (OSTI)

We report on the important role played by internal quantum well (QW) fields in the anomalous inversion of capacitance transients in InGaN/GaN multi-QW light-emitting diodes (LEDs). This effect was observed by deep-level transient spectroscopy (DLTS) ... Keywords: Deep level, III-Nitride, Internal fields, Quantum well

L. Rigutti; A. Castaldini; A. Cavallini

2009-02-01T23:59:59.000Z

329

A comparison of digital radiography systems in terms of effective detective quantum efficiency  

SciTech Connect

Purpose: The purpose of this study is to compare digital radiography systems using the metric effective detective quantum efficiency (eDQE), which better reflects digital radiography imaging system performance under clinical operating conditions, in comparison with conventional metrics such as modulation transfer function (MTF), normalized noise power spectra (NNPS), and detective quantum efficiency (DQE). Methods: The eDQE was computed by the calculation of the MTF, the NNPS, the phantom attenuation and scatter, and estimation of x-ray flux. The physical characterization of the systems was obtained with the standard beam conditions RQA5 and RQA9, using the PA Chest phantom proposed by AAPM Report no. 31 simulating the attenuation and scatter characteristics of the adult human thorax. The MTF (eMTF) was measured by using an edge test placed at the frontal surface of the phantom, the NNPS (eNNPS) was calculated from images of the phantom acquired at three different exposure levels covering the operating range of the system (E{sub 0}, which is the exposure at which a system is normally operated, 1/3 E{sub 0}, and 3 E0), and scatter measurements were assessed by using a beam-stop technique. The integral of DQE (IDQE) and eDQE (IeDQE) was calculated over the whole spatial frequency range. Results: The eMTF results demonstrate degradation due to magnification and the presence of scattered radiation. The eNNPS was influenced by the grid presence, and in some systems, it contained structured noise. At typical clinical exposure levels, the magnitude of eDQE(0) with respect to DQE(0) at RQA9 beam conditions was 13%, 17%, 16%, 36%, and 24%, respectively, for Carestream DRX-1, Carestream DRX-1C, Carestream Direct View CR975, Philips Digital Diagnost VM, and GE Revolution XR/d. These results were confirmed by the ratio of IeDQE and IDQE in the same conditions. Conclusions: The authors confirm the robustness and reproducibility of the eDQE method. As expected, the DR systems performed better than the CR systems due to their superior signal-to-noise transfer characteristics. The results of this study suggest the eDQE method may provide an opportunity to more accurately assess the clinical performance of digital radiographic imaging systems by accounting for factors such as the presence of scatter, use of an antiscatter grid, and magnification and focal spot blurring effects, which are not reflected in conventional DQE measures.

Bertolini, Marco; Nitrosi, Andrea; Rivetti, Stefano; Lanconelli, Nico; Pattacini, Pierpaolo; Ginocchi, Vladimiro; Iori, Mauro [Department of Advanced Technology, Medical Physics Unit, Azienda Ospedaliera ASMN, Istituto di Ricovero e Cura a Carattere Scientifico, Reggio Emilia 42123 (Italy); Fisica Medica, Ospedale di Sassuolo S.p.A., Modena 41049 (Italy); Alma Mater Studiorum, Physics Department, University of Bologna, Bologna 40127 (Italy); Department of Diagnostic Imaging, Radiology Unit, Azienda Ospedaliera ASMN, Istituto di Ricovero e Cura a Carattere Scientifico, Reggio Emilia 42123 (Italy); Department of Diagnostic Imaging, Radiology Unit, Azienda USL, Reggio Emilia 42122 (Italy); Department of Advanced Technology, Medical Physics Unit, Azienda Ospedaliera ASMN, Istituto di Ricovero e Cura a Carattere Scientifico, Reggio Emilia 42123 (Italy)

2012-05-15T23:59:59.000Z

330

Influence of image charge effect on exciton fine structure in an organic-inorganic quantum well material  

SciTech Connect

We have investigated experimentally excitonic properties in organic-inorganic hybrid multi quantum well crystals, (C{sub 4}H{sub 9}NH{sub 3}){sub 2}PbBr{sub 4} and (C{sub 6}H{sub 5}?C{sub 2}H{sub 4}NH{sub 3}){sub 2}PbBr{sub 4}, by measuring photoluminescence, reflectance, photoluminescence excitation spectra. In these materials, the excitonic binding energies are enhanced not only by quantum confinement effect (QCE) but also by image charge effect (ICE), since the dielectric constant of the barrier layers is much smaller than that of the well layers. By comparing the 1s-exciton and 2s-exciton energies, we have investigated the influence of ICE with regard to the difference of the Bohr radius.

Takagi, Hidetsugu; Kunugita, Hideyuki; Ema, Kazuhiro [Department of Physics, Sophia University, 7-1 Kioi-cho, Chiyoda-ku, Tokyo 102-8554 (Japan); Sato, Mikio; Takeoka, Yuko [Department of Materials and Life Sciences, Sophia University, 7-1 Kioi-cho, Chiyoda-ku, Tokyo 102-8554 (Japan)

2013-12-04T23:59:59.000Z

331

Carrier effective masses in symmetrically strained (GaIn)As/Ga(PAs) multiple-quantum-well structures  

Science Journals Connector (OSTI)

The carrier effective masses in symmetrically strained (GaIn)As/Ga(PAs) multiple-quantum-well heterostructures have been determined as a function of the incorporated compressive strain in the (GaIn)As quantum-well layer by applying magneto-optical studies. The precise structural parameters, i.e., individual layer thicknesses, strain values, and crystalline perfection, have been determined independently by high-resolution x-ray diffraction and transmission electron microscopy. By analyzing both the allowed and forbidden optical transitions as a function of the magnetic field, detected by polarization-dependent magnetophotoluminescence excitation spectroscopy, the exciton binding energy as well as the effective in-plane electron and heavy-hole masses have been determined quantitatively as a function of strain. The theoretically predicted significant decrease of the in-plane heavy-hole mass with increasing strain has been observed. The obtained results are discussed and compared with the contradictory results reported in the literature.

M. Volk; S. Lutgen; T. Marschner; W. Stolz; E. O. Gbel; P. C. M. Christianen; J. C. Maan

1995-10-15T23:59:59.000Z

332

Enhancement of fusion rates due to quantum effects in the particles momentum distribution in nonideal media  

E-Print Network (OSTI)

This study concerns a situation when measurements of the nonresonant cross-section of nuclear reactions appear highly dependent on the environment in which the particles interact. An appealing example discussed in the paper is the interaction of a deuteron beam with a target of deuterated metal Ta. In these experiments, the reaction cross section for d(d,p)t was shown to be orders of magnitude greater than what the conventional model predicts for the low-energy particles. In this paper we take into account the influence of quantum effects due to the Heisenberg uncertainty principle for particles in a non-ideal medium elastically interacting with the medium particles. In order to calculate the nuclear reaction rate in the non-ideal environment we apply both the Monte Carlo technique and approximate analytical calculation of the Feynman diagram using nonrelativistic kinetic Green's functions in the medium which correspond to the generalized energy and momentum distribution functions of interacting particles. We...

Fisch, N J; Petrushevich, Yu V; Quarati, Piero; Starostin, A N

2011-01-01T23:59:59.000Z

333

A functional approach to quantum friction: effective action and dissipative force  

E-Print Network (OSTI)

We study the Casimir friction due to the relative, uniform, lateral motion of two parallel semitransparent mirrors coupled to a vacuum real scalar field, $\\phi$. We follow a functional approach, whereby nonlocal terms in the action for $\\phi$, concentrated on the mirrors' locii, appear after functional integration of the microscopic degrees of freedom. This action for $\\phi$, which incorporates the relevant properties of the mirrors, is then used as the starting point for two complementary evaluations: Firstly, we calculate the { in-out} effective action for the system, which develops an imaginary part, hence a non-vanishing probability for the decay (because of friction) of the initial vacuum state. Secondly, we evaluate another observable: the vacuum expectation value of the frictional force, using the { in-in} or Closed Time Path formalism. Explicit results are presented for zero-width mirrors and half-spaces, in a model where the microscopic degrees of freedom at the mirrors are a set of identical quantum harmonic oscillators, linearly coupled to $\\phi$

M. Beln Faras; Csar D. Fosco; Fernando C. Lombardo; Francisco D. Mazzitelli; Adrin E. Rubio Lpez

2014-12-30T23:59:59.000Z

334

The Casimir effect from the point of view of algebraic quantum field theory  

E-Print Network (OSTI)

We consider a region of Minkowski spacetime bounded either by one or by two parallel, infinitely extended plates orthogonal to a spatial direction and a real Klein-Gordon field satisfying Dirichlet boundary conditions. We quantize these two systems within the algebraic approach to quantum field theory using the so-called functional formalism. As a first step we construct a suitable unital *-algebra of observables whose generating functionals are characterized by a labeling space which is at the same time optimal and separating. Subsequently we give a definition for these systems of Hadamard states and we investigate explicit examples. In the case of a single plate, it turns out that one can build algebraic states via a pull-back of those on the whole Minkowski spacetime, moreover inheriting from them the Hadamard property. When we consider instead two plates, algebraic states can be put in correspondence with those on flat spacetime via the so-called method of images, which we translate to the algebraic setting. For a massless scalar field we show that this procedure works perfectly for a large class of quasi-free states including the Poincar\\'e vacuum and KMS states. Eventually we use our results in both systems to introduce the notion of Wick polynomials, showing that a global extended algebra does not exist. Furthermore we construct explicitly the two-point function and the regularized energy density, showing, moreover, that the outcome is consistent with the standard results of the Casimir effect.

Claudio Dappiaggi; Gabriele Nosari; Nicola Pinamonti

2014-12-03T23:59:59.000Z

335

Structure transitions induced by the Hall term in homogeneous and isotropic magnetohydrodynamic turbulence  

SciTech Connect

Hall effects on local structures in homogeneous, isotropic, and incompressible magnetohydrodynamic turbulence are studied numerically. The transition of vortices from sheet-like to tubular structures induced by the Hall term is found, while the kinetic energy spectrum does not distinguish the two types of structures. It is shown by the use of the sharp low-pass filter that the transition occurs not only in the scales smaller than the ion skin depth but also in a larger scale. The transition is related with the forward energy transfer in the spectral space. Analyses by the use of the sharp low-pass filter show that the nonlinear energy transfer associated with the Hall term is dominated by the forward transfer and relatively local in the wave number space. A projection of the simulation data to a Smagorinsky-type sub-grid-scale model shows that the high wave number component of the Hall term may possibly be replaced by the model effectively.

Miura, H., E-mail: miura.hideaki@nifs.ac.jp [Department of Helical Plasma Research, National Institute for Fusion Science, 322-6 Oroshi, Toki, Gifu 509-5292 (Japan); Araki, K. [Faculty of Engineering, Okayama University of Science, 1-1 Ridai-cho, Okayama 700-0005 (Japan)

2014-07-15T23:59:59.000Z

336

POOL INFORMATION McComas Hall  

E-Print Network (OSTI)

#12;POOL INFORMATION McComas Hall 25-yard, 8-lane swimming pool with a maximum depth of 6.5 feet.recsports.vt.edu/facilities/reservations 3) Is there swim equipment I can use at the pool? Yes, each pool has a variety of kick boards, pull swimming facilities? Access to both McComas and War Memorial Pools are through the locker rooms only

Buehrer, R. Michael

337

Diversity and Inclusion Town Hall Program Book | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Diversity and Inclusion Town Hall Program Book Diversity and Inclusion Town Hall Program Book Diversity and Inclusion Town Hall Program Book As part of a larger effort to create a culture that values diversity, we have been conducting focus groups to engage in a dialog and hear feedback on how diversity can be improved. At the Town Hall, DOE employees will hear the results of these discussions. View the program booklet from the Diversity and Inclusion Town Hall below. For more information about the Department's diversity and inclusion programs, visit http://energy.gov/diversity/services/diversity-and-inclusion Diversity Town Hall Program Booklet_0.pdf More Documents & Publications Diversity Action Letter from Secretary Chu Secretary Chu's Diversity Action Letter Government-Wide Diversity and Inclusion Strategic Plan (2011), Office of

338

Secretary Moniz Leads DOE Town Hall | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Moniz Leads DOE Town Hall Moniz Leads DOE Town Hall Secretary Moniz Leads DOE Town Hall May 22, 2013 - 6:30pm Addthis Secretary Moniz and Deputy Secretary Poneman address questions from Department of Energy employees in a town hall. Erin R. Pierce Erin R. Pierce Digital Communications Specialist, Office of Public Affairs Secretary Moniz: Week One Watch the swearing-in ceremony. See a video recap of Secretary Moniz's first day in office. View a slideshow of photos from the DOE Town Hall. "I have a lot of hope and aspirations for what we're going to accomplish here together." So began Energy Secretary Ernest Moniz as he led a town hall discussion with Energy Department employees on his second day in office. Held at DOE headquarters in Washington, D.C., Secretary Moniz shared his

339

Valley pair qubits in double quantum dots of gapped graphene  

E-Print Network (OSTI)

The rise of graphene opens a new door to qubit implementation, as discussed in the recent proposal of valley pair qubits in double quantum dots of gapped graphene (Wu et al., arXiv: 1104.0443 [cond-mat.mes-hall]). The work here presents the comprehensive theory underlying the proposal. It discusses the interaction of electrons with external magnetic and electric fields in such structures. Specifically, it examines a strong, unique mechanism, i.e., the analogue of the 1st-order relativistic effect in gapped graphene. This mechanism is state mixing free and allows, together with the electrically tunable exchange coupling, a fast, all-electric manipulation of qubits via electric gates, in the time scale of ns. The work also looks into the issue of fault tolerance in a typical case, yielding at 10oK a long qubit coherence time (~O(ms)).

G. Y. Wu; N. -Y. Lue; L. Chang

2011-07-03T23:59:59.000Z

340

Changing quantum reference frames  

E-Print Network (OSTI)

We consider the process of changing reference frames in the case where the reference frames are quantum systems. We find that, as part of this process, decoherence is necessarily induced on any quantum system described relative to these frames. We explore this process with examples involving reference frames for phase and orientation. Quantifying the effect of changing quantum reference frames serves as a first step in developing a relativity principle for theories in which all objects including reference frames are necessarily quantum.

Matthew C. Palmer; Florian Girelli; Stephen D. Bartlett

2014-05-21T23:59:59.000Z

Note: This page contains sample records for the topic "quantum hall effect" 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

Gaussian quantum information  

Science Journals Connector (OSTI)

The science of quantum information has arisen over the last two decades centered on the manipulation of individual quanta of information, known as quantum bits or qubits. Quantum computers, quantum cryptography, and quantum teleportation are among the most celebrated ideas that have emerged from this new field. It was realized later on that using continuous-variable quantum information carriers, instead of qubits, constitutes an extremely powerful alternative approach to quantum information processing. This review focuses on continuous-variable quantum information processes that rely on any combination of Gaussian states, Gaussian operations, and Gaussian measurements. Interestingly, such a restriction to the Gaussian realm comes with various benefits, since on the theoretical side, simple analytical tools are available and, on the experimental side, optical components effecting Gaussian processes are readily available in the laboratory. Yet, Gaussian quantum information processing opens the way to a wide variety of tasks and applications, including quantum communication, quantum cryptography, quantum computation, quantum teleportation, and quantum state and channel discrimination. This review reports on the state of the art in this field, ranging from the basic theoretical tools and landmark experimental realizations to the most recent successful developments.

Christian Weedbrook; Stefano Pirandola; Ral Garca-Patrn; Nicolas J. Cerf; Timothy C. Ralph; Jeffrey H. Shapiro; Seth Lloyd

2012-05-01T23:59:59.000Z

342

Quasi-adiabatic Continuation for Disordered Systems: Applications to Correlations, Lieb-Schultz-Mattis, and Hall Conductance  

E-Print Network (OSTI)

We present a possible definition of a mobility gap for a many-body quantum system, in analogy to definitions of dynamical localization for single particle systems. Using this definition, we construct "corrected" quasi-adiabatic continuation operators. Under an appropriate definition of a unique ground state, we show how to introduce virtual fluxes. Armed with these results, we can directly carry over previous results in the case of a spectral gap. We present a proof of decay of correlation functions and we present a proof of Hall conductance quantization under very mild density-of-states assumptions defined later. We also generalize these definitions to the case of a "bulk mobility gap", in the case of a system with boundaries, and present a proof of Hall conductance quantization on an annulus under appropriate assumptions. Further, we present a new "optimized" quasi-adiabatic continuation operator which simplifies previous estimates and tightens bounds in certain cases. This is presented in an appendix which can be read independently of the rest of the paper as it also improves estimates in the case of systems with a spectral gap. This filter function used decays in time at least as fast as ${\\cal O}(\\exp(-t^\\alpha))$ for all $\\alpha<1$, a class of decay called subexponential (a tighter description of what is possible is below). Using this function it is possible to tighten recent estimates of the Hall conductance quantization for gapped systems\\cite{hall} to a decay which is subexponential in system size.

M. B. Hastings

2010-01-28T23:59:59.000Z

343

Rebuilding It Better: Greensburg, Kansas, City Hall | Open Energy  

Open Energy Info (EERE)

Hall Hall Jump to: navigation, search Name Rebuilding It Better: Greensburg, Kansas, City Hall Agency/Company /Organization National Renewable Energy Laboratory Focus Area Agriculture, Buildings, Economic Development, Energy Efficiency, Water Conservation, Renewable Energy, Ground Source Heat Pumps, - Solar Pv, Wind Phase Bring the Right People Together, Create a Vision, Evaluate Options, Develop Goals, Develop Finance and Implement Projects, Create Early Successes Resource Type Case studies/examples Availability Publicly available--Free Publication Date 9/1/2010 Website http://apps1.eere.energy.gov/b Locality Greensburg, Kansas References Rebuilding It Better: Greensburg, Kansas, City Hall [1] Contents 1 Overview 2 Highlights 3 Environmental Aspects 4 References

344

The Rockefeller University Office of Technology Transfer 502 Founders Hall  

E-Print Network (OSTI)

The Rockefeller University Office of Technology Transfer 502 Founders Hall 1230 York Avenue New Technology Transfer (212) 327-7095 tsuprapto@rockefeller.edu #12;

345

The Rockefeller University Office of Technology Transfer 502 Founders Hall  

E-Print Network (OSTI)

The Rockefeller University Office of Technology Transfer 502 Founders Hall 1230 York Avenue New Director Technology Transfer (212) 327-7095 tsuprapto@rockefeller.edu #12;

346

Rebuilding It Better: Greensburg, Kansas. City Hall (Brochure)  

Office of Energy Efficiency and Renewable Energy (EERE)

This brochure details the energy efficient and sustainable aspects of the LEED Platinum-designated City Hall building in Greensburg, Kansas.

347

Quantum Physics and Nanotechnology  

E-Print Network (OSTI)

Experimental studies of infinite (unrestricted at least in one direction) quantum particle motion using probe nanotechnologies have revealed the necessity of revising previous concepts of their motion. Particularly, quantum particles transfer quantum motion nonlocality energy beside classical kinetic energy, in other words, they are in two different kinds of motion simultaneously. The quantum component of the motion energy may be quite considerable under certain circumstances. Some new effects were predicted and proved experimentally in terms of this phenomenon. A new prototype refrigerating device was tested, its principle of operation being based on the effect of transferring the quantum component of the motion energy.

Vladimir K. Nevolin

2011-06-06T23:59:59.000Z

348

Effect of plasmonic losses on light emission enhancement in quantum-wells coupled to metallic gratings  

SciTech Connect

Recent experimental work has shown significant luminescence enhancement from near-surface quantum-well (QW) structures using metallic grating to convert surface plasmon (SP) modes into radiative modes. This work introduces a detailed theoretical study of plasmonic losses and the role of SPs in improving light extraction from grated light-emitting QW structures, using the fluctuational electrodynamics method. The method explains experimental results demonstrating emission enhancement, light scattering, and plasmonic coupling in the structures. We study these effects in angle-resolved reflectometry and luminescence setups in InGaN QW structures with silver grating. In contrast to experiments, our model allows direct calculation of the optical losses. The model predicts that the plasmonic coupling and scattering increases light emission by a factor of up to three compared to a flat semiconductor structure. This corresponds to reducing the absorption losses from approximately 93% in the ungrated metallic structure to 75% in the grated structure. Lower losses are associated with a significant emission enhancement enabled by the SPs of silver/GaN interfaces, which are present in the blue/green wavelength range, and can be optimized by carefully nanostructuring the metal layer and by the positioning of the QW. In general, the enhancement results from the interplay of mode scattering, conversion of SP energy directly into light, and losses in the metallic grating. The reported losses are very high when compared to the losses present in modern light-emitting diodes (LEDs). Albeit, our work provides tools needed for further optimization of plasmonic light extraction, eventually leading to highly efficient LEDs.

Sadi, Toufik; Oksanen, Jani; Tulkki, Jukka [Department of Biomedical Engineering and Computational Sciences, Aalto University, P.O. Box 12200, FI-00076 Aalto (Finland)

2013-12-14T23:59:59.000Z

349

A fully 3D atomistic quantum mechanical study on random dopant induced effects in 25nm MOSFETs  

E-Print Network (OSTI)

A Fully 3D Atomistic Quantum Mechanical Study on RandomWang* Abstract We present a fully 3D atomistic quantum me-Dopant ?uctuation, MOSFETs, 3D, threshold, LCBB, quantum

Jiang, Xiang-Wei

2008-01-01T23:59:59.000Z

350

CONTROL OF THE ACCELERATION REGION IN HALL THRUSTERS David Staack, Yevgeny Raitses and Nathaniel J. Fisch  

E-Print Network (OSTI)

electrodes in Hall thruster were performed with the PPPL 90mm Hall thruster, shown in Fig. 1. The details electrode is 8 mm long. Inner Segmented Electrode Figure 1: PPPL 90 mm Hall thruster Figure 2: Location

351

Schedule and cost estimate for an innovative Boston Harbor concert hall  

E-Print Network (OSTI)

This thesis formulates a cost estimate and schedule for constructing the Boston Concert Hall, an innovative hypothetical building composed of two concert halls and a restaurant. Concert Halls are complex and expensive ...

Coste, Amelie, 1982-

2004-01-01T23:59:59.000Z

352

Nonlinear friction in quantum mechanics  

E-Print Network (OSTI)

The effect of nonlinear friction forces in quantum mechanics is studied via dissipative Madelung hydrodynamics. A new thermo-quantum diffusion equation is derived, which is solved for the particular case of quantum Brownian motion with a cubic friction. It is extended also by a chemical reaction term to describe quantum reaction-diffusion systems with nonlinear friction as well.

Roumen Tsekov

2010-03-01T23:59:59.000Z

353

Beam Loss Ion Chamber System Upgrade for Experimental Halls  

SciTech Connect

The Beam loss Ion Chamber System (BLICS) was developed to protect Jefferson Labs transport lines, targets and beam dumps from a catastrophic ''burn through''. Range changes and testing was accomplished manually requiring the experiment to be shut down. The new upgraded system is based around an ''off the shelf'' Programmable Logic Controller located in a single control box supporting up to ten individual detectors. All functions that formerly required an entry into the experimental hall and manual adjustment can be accomplished from the Machine Control Center (MCC). A further innovation was the addition of a High Voltage ''Brick'' at the detector location. A single cable supplies the required voltage for the Brick and a return line for the ion chamber signal. The read back screens display range, trip point, and accumulated dose for each location. The new system is very cost effective and significantly reduces the amount of lost experimental time.

D.W. Dotson; D.J. Seidman

2005-05-16T23:59:59.000Z

354

Proximity effect bilayer nano superconducting quantum interference devices for millikelvin magnetometry  

SciTech Connect

Superconducting quantum interference devices (SQUIDs) incorporating thin film nanobridges as weak links have sensitivities approaching that required for single spin detection at 4.2?K. However, due to thermal hysteresis they are difficult to operate at much lower temperatures which hinder their application to many quantum measurements. To overcome this, we have developed nanoscale SQUIDs made from titanium-gold proximity bilayers. We show that their electrical properties are consistent with a theoretical model developed for heat flow in bilayers and demonstrate that they enable magnetic measurements to be made on a sample at system temperatures down to 60 mK.

Blois, A., E-mail: a.blois@ucl.ac.uk; Rozhko, S.; Romans, E. J. [London Centre for Nanotechnology, University College London (UCL), 17-19 Gordon Street, London WC1H 0AH (United Kingdom); Hao, L.; Gallop, J. C. [National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW (United Kingdom)

2013-12-21T23:59:59.000Z

355

A Proposed Alternative Low Energy Quantum Field Theory of Gravity Based on a Bose-Einstein Condensate Effect  

E-Print Network (OSTI)

An alternative quantum field theory for gravity is proposed for low energies based on an attractive effect between contaminants in a Bose-Einstein Condensate rather than on particle exchange. In the ``contaminant in condensate effect," contaminants cause a potential in an otherwise uniform condensate, forcing the condensate between two contaminants to a higher energy state. The energy of the system decreases as the contaminants come closer together, causing an attractive force between contaminants. It is proposed that mass-energy may have a similar effect on Einstein's space-time field, and gravity is quantized by the same method by which the contaminant in condensate effect is quantized. The resulting theory is finite and, if a physical condensate is assumed to underly the system, predictive. However, the proposed theory has several flaws at high energies and is thus limited to low energies. Falsifiable predictions are given for the case that the Higgs condensate is assumed to be the condensate underlying gravity.

Alexander Oshmyansky

2007-03-08T23:59:59.000Z

356

The Rockefeller University Office of Technology Transfer 502 Founders Hall  

E-Print Network (OSTI)

The Rockefeller University Office of Technology Transfer 502 Founders Hall 1230 York Avenue New://newswire.rockefeller.edu/?page=engine&id=939 Nidhi Sabharwal, Ph.D. Technology Manager Office of Technology Transfer (212) 327-7092 nsabharwal@rockefeller.edu #12;The Rockefeller University Office of Technology Transfer 502 Founders Hall 1230 York Avenue New

357

The Rockefeller University Office of Technology Transfer 502 Founders Hall  

E-Print Network (OSTI)

The Rockefeller University Office of Technology Transfer 502 Founders Hall 1230 York Avenue New.D. Assistant Director Technology Transfer (212) 327-7095 tsuprapto@rockefeller.edu #12;The Rockefeller University Office of Technology Transfer 502 Founders Hall 1230 York Avenue New York, NY 10021-6399 www

358

The Rockefeller University Office of Technology Transfer 502 Founders Hall  

E-Print Network (OSTI)

The Rockefeller University Office of Technology Transfer 502 Founders Hall 1230 York Avenue New.1217207109 Tari Suprapto, Ph.D. Assistant Director Technology Transfer (212) 327-7095 tsuprapto@rockefeller.edu #12;The Rockefeller University Office of Technology Transfer 502 Founders Hall 1230 York Avenue New

359

The Rockefeller University Office of Technology Transfer 502 Founders Hall  

E-Print Network (OSTI)

The Rockefeller University Office of Technology Transfer 502 Founders Hall 1230 York Avenue New activation. Tari Suprapto, Ph.D. Assistant Director Technology Transfer (212) 327-7095 tsuprapto@rockefeller.edu #12;The Rockefeller University Office of Technology Transfer 502 Founders Hall 1230 York Avenue New

360

The Rockefeller University Office of Technology Transfer 502 Founders Hall  

E-Print Network (OSTI)

The Rockefeller University Office of Technology Transfer 502 Founders Hall 1230 York Avenue New.D. Assistant Director Technology Transfer (212) 327-7095 tsuprapto@rockefeller.edu #12;The Rockefeller University Office of Technology Transfer 502 Founders Hall 1230 York Avenue New York, NY 10065 www

Note: This page contains sample records for the topic "quantum hall effect" 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

The Rockefeller University Office of Technology Transfer 502 Founders Hall  

E-Print Network (OSTI)

The Rockefeller University Office of Technology Transfer 502 Founders Hall 1230 York Avenue NewRNA and antisense therapeutics Tari Suprapto, Ph.D. Assistant Director Technology Transfer (212) 327-7095 tsuprapto@rockefeller.edu #12;The Rockefeller University Office of Technology Transfer 502 Founders Hall 1230 York Avenue New

362

The Rockefeller University Office of Technology Transfer 502 Founders Hall  

E-Print Network (OSTI)

The Rockefeller University Office of Technology Transfer 502 Founders Hall 1230 York Avenue New University Office of Technology Transfer 502 Founders Hall 1230 York Avenue New York, NY 10021-6399 www.rockefeller.edu/techtransfer Tari Suprapto, Ph.D. Assistant Director Technology Transfer (212) 327-7095 tsuprapto

de Lange, Titia

363

The Rockefeller University Office of Technology Transfer 502 Founders Hall  

E-Print Network (OSTI)

The Rockefeller University Office of Technology Transfer 502 Founders Hall 1230 York Avenue New Sabharwal, Ph.D. Technology Manager Office of Technology Transfer (212) 327-7092 nsabharwal@rockefeller.edu #12;The Rockefeller University Office of Technology Transfer 502 Founders Hall 1230 York Avenue New

364

The Rockefeller University Office of Technology Transfer 502 Founders Hall  

E-Print Network (OSTI)

The Rockefeller University Office of Technology Transfer 502 Founders Hall 1230 York Avenue New:1484-1488. #12;The Rockefeller University Office of Technology Transfer 502 Founders Hall 1230 York Avenue New York, NY 10021-6399 www.rockefeller.edu/techtransfer Tari Suprapto, Ph.D. Assistant Director Technology

365

Sidewall Materials for Hall-Hroult Mr Reiza Mukhlis  

E-Print Network (OSTI)

of a Hall-Heroult prebaked anode electrolysis cell* Hall-Héroult Process Carbon anode need to be replaced ~ Total Cell Voltage Frac. Current Efficiency Voltage distribution chart of carbon anode cell* *Grjotheim Sidewall materials directly exposed to bath #12;Inert Anode Application Anode Type/Scenario Carbon* Inert/1

Liley, David

366

Campus and Residential Services Daisy Bank Hall Handbook  

E-Print Network (OSTI)

Campus and Residential Services Daisy Bank Hall Handbook 2011 - 2012 #12;1 WELCOME We offer you. Enjoy your time at Daisy Bank! Chris Dawson Mark Irwin Warden Hall Manager September 2011 This Handbook prior to signing them. Below is a list of some of the `key' Terms. This list does not contain all

367

Quantum Kinetics of Deconfinement Transitions in Dense Nuclear Matter: Dissipation Effects at Low Temperatures  

Science Journals Connector (OSTI)

......nuclear matter of temperature ;S 0.1 MeV, as found in a neutron star core, if it occurs dynamically, is likely to pro- ceed via quantum nucleation, although no definite conclusion can be drawn in the absence of the exact information about ex and......

Kei Iida

1997-09-01T23:59:59.000Z

368

Quantum effects and competing interactions in crystals of the mixed rubidium and ammonium dihydrogen phosphate system  

Science Journals Connector (OSTI)

Quantum corrections are introduced in a simple two-sublattice model, which describes well both para-ferro (TC) and para-antiferroelectric (TN) phase transitions in mixed crystals of the potassium dihydrogen phosphate family, leading to a determination of the phase diagram in satisfactory agreement with that observed in rubidium and ammonium dihydrogen phosphate mixed crystals.

Julio A. Gonzalo

1989-06-01T23:59:59.000Z

369

Dynamic nuclear polarization and Hanle effect in (In,Ga)As/GaAs quantum dots. Role of nuclear spin fluctuations  

SciTech Connect

The degree of circular polarization of photoluminescence of (In,Ga)As quantum dots as a function of magnetic field applied perpendicular to the optical axis (Hanle effect) is experimentally studied. The measurements have been performed at various regimes of the optical excitation modulation. The analysis of experimental data has been performed in the framework of a vector model of regular nuclear spin polarization and its fluctuations. The analysis allowed us to evaluate the magnitude of nuclear polarization and its dynamics at the experimental conditions used.

Gerlovin, I. Ya. [Spin Optics Laboratory, Saint Petersburg State University, Petrodvorets, 198504 St. Petersburg (Russian Federation); Cherbunin, R. V.; Ignatiev, I. V.; Kuznetsova, M. S.; Verbin, S. Yu. [Spin Optics Laboratory, Saint Petersburg State University, Petrodvorets, 198504 St. Petersburg, Russia and Experimentelle Physik 2, Technische Universitt Dortmund, D-44221 Dortmund (Germany); Flisinski, K.; Bayer, M. [Experimentelle Physik 2, Technische Universitt Dortmund, D-44221 Dortmund (Germany); Reuter, D.; Wieck, A. D. [Angewandte Festkrperphysik, Ruhr-Universitt Bochum, D-44780 Bochum (Germany); Yakovlev, D. R. [Experimentelle Physik 2, Technische Universitt Dortmund, D-44221 Dortmund, Germany and A. F. Ioffe Physical-Technical Institute, Russian Academy of Sciences, 194021 St. Petersburg (Russian Federation)

2013-12-04T23:59:59.000Z

370

Rebuilding It Better: Greensburg, Kansas. City Hall (Brochure)  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

City Hall City Hall Destroyed in the tornado, City Hall has been rebuilt green incorporating solar panels, ground source heat pumps, reclaimed materials, and a vegetated roof. The building serves as a symbol of Greensburg's vitality and leadership in becoming a sustainable community where social, environmental, and economic concerns are held in balance. The new Greensburg City Hall is projected to achieve more than 38% energy savings compared to a similar building built to standard code due in part to the 4.8-kilowatt (kW) rooftop photovoltaic (PV) system and ground source heat pumps. REBUILDING IT BETTER: GREENSBURG, KANSAS LEED® Platinum Completed in October 2009, Greensburg City Hall achieved the U.S. Green Building Council's Leadership in Energy and Environmental Design

371

Missed Today's Town Hall with Sec. Chu? | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Missed Today's Town Hall with Sec. Chu? Missed Today's Town Hall with Sec. Chu? Missed Today's Town Hall with Sec. Chu? January 26, 2011 - 4:02pm Addthis We have the video of today's online town hall event with Secretary Chu up and ready for your viewing. Check it out here. Ginny Simmons Ginny Simmons Former Managing Editor for Energy.gov, Office of Public Affairs We have the video of today's online town hall event with Secretary Chu up and ready for your viewing. Check it out here. During the event, Secretary Chu highlighted several parts of the President Obama's clean energy and innovation agenda: Ending taxpayer subsidies for fossil fuels so we can increase our investments in clean energy by a third; Creating three new Energy Innovation Hubs; Putting one million advanced technology vehicles on the road by

372

Magnetorotational instability in the Hall regime in a hot-electron plasma  

SciTech Connect

The magnetorotational instability (MRI) in the Hall regime in a hot-electron plasma is analyzed. The dispersion relation is derived for a rotating plasma with both finite electron pressure and pressure anisotropy. It is pointed out that the former effect has to be taken into account in the Hall regime, for {beta} > or approx.l 1, where {beta} is the ratio of electron pressure to the magnetic field pressure. As a whole, the effects of order {beta} weaken or suppress the MRI. It is shown that in the presence of electron pressure anisotropy, a hybrid of MRI and anisotropic instability appears, and that anisotropy of type T{sub perpendicular}>T{sub parallel} is destabilizing, while T{sub parallel}>T{sub perpendicular} is stabilizing, where T{sub perpendicular} and T{sub parallel} are the perpendicular and parallel electron temperatures, respectively.

Mikhailovskii, A. B.; Lominadze, J. G.; Galvao, R. M. O.; Vladimirov, S. V.; Churikov, A. P.; Erokhin, N. N.; Smolyakov, A. I.; Tsypin, V. S. [Institute of Nuclear Fusion, Russian Research Centre Kurchatov Institute, Kurchatov Sq., 1, Moscow 123182 (Russian Federation); Kharadze Abastumani National Astrophysical Observatory, 2a, Kazbegi Ave., Tbilisi 0160 (Georgia); Physics Institute, University of Sao Paulo, Cidade Universitaria, 05508-900, Sao Paulo, Brazil and Brazilian Center for Physics Research, Rua Xavier Sigaud, 150, 22290-180, Rio de Janeiro (Brazil); School of Physics, University of Sydney, N.S.W. 2006 (Australia); Syzran Branch of Samara Technical University, 45, Sovetskaya Str., Syzran, Samara Region 446001 (Russian Federation); Institute of Nuclear Fusion, Russian Research Centre Kurchatov Institute, Kurchatov Sq., 1, Moscow 123182 (Russian Federation); University of Saskatchewan, 116 Science place, Saskatoon S7N 5E2 (Canada) and Institute of Nuclear Fusion, Russian Research Centre Kurchatov Institute, Kurchatov Sq., 1, Moscow 123182 (Russian Federation); Brazilian Center for Physics Research, Rua Xavier Sigaud, 150, 22290-180, Rio de Janeiro (Brazil)

2007-11-15T23:59:59.000Z

373

Quantum Privacy and Quantum Coherence  

Science Journals Connector (OSTI)

We derive a simple relation between a quantum channel's capacity to convey coherent (quantum) information and its usefulness for quantum cryptography.

Benjamin Schumacher and Michael D. Westmoreland

1998-06-22T23:59:59.000Z

374

Cylindrical Hall Thrusters with Permanent Magnets  

SciTech Connect

The use of permanent magnets instead of electromagnet coils for low power Hall thrusters can offer a significant reduction of both the total electric power consumption and the thruster mass. Two permanent magnet versions of the miniaturized cylindrical Hall thruster (CHT) of different overall dimensions were operated in the power range of 50W-300 W. The discharge and plasma plume measurements revealed that the CHT thrusters with permanent magnets and electromagnet coils operate rather differently. In particular, the angular ion current density distribution from the permanent magnet thrusters has an unusual halo shape, with a majority of high energy ions flowing at large angles with respect to the thruster centerline. Differences in the magnetic field topology outside the thruster channel and in the vicinity of the channel exit are likely responsible for the differences in the plume characteristics measured for the CHTs with electromagnets and permanent magnets. It is shown that the presence of the reversing-direction or cusp-type magnetic field configuration inside the thruster channel without a strong axial magnetic field outside the thruster channel does not lead to the halo plasma plume from the CHT. __________________________________________________

Yevgeny Raitses, Enrique Merino and Nathaniel J. Fisch

2010-10-18T23:59:59.000Z

375

Effect of pressure on the quantum spin ladder material IPA-CuCl3.  

SciTech Connect

Inelastic-neutron-scattering and bulk magnetic-susceptibility studies of the quantum S = 1/2 spin ladder system (CH{sub 3}){sub 2}CHNH{sub 3}CuCl{sub 3} are performed under hydrostatic pressure. The pressure dependence of the spin gap {Delta} is determined. At P = 1500 MPa it is reduced to {Delta} =0.79 meV from {Delta} =1.17 meV at ambient pressure. The results allow us to predict a soft-mode quantum phase transition in this system at P{sub c} {approx} 4 GPa. The measurements are complicated by the proximity of a structural phase transition that leads to a deterioration of the sample.

Hong, Tao [ORNL; Garlea, Vasile O [ORNL; Zheludev, Andrey I [ORNL; Fernandez-Baca, Jaime A [ORNL; Manaka, H. [Kagoshima University, Kagoshima JAPAN; Chang, S. [National Institute of Standards and Technology (NIST); Leao, J. B. [National Institute of Standards and Technology (NIST); Poulton, S. J. [National Institute of Standards and Technology (NIST)

2008-01-01T23:59:59.000Z

376

Effect of Organic and Inorganic Passivation in Quantum-Dot-Sensitized Solar Cells  

Science Journals Connector (OSTI)

This work was supported by the Institute of Nanotechnologies for Clean Energies (INCE), funded by the Generalitat Valenciana under Project ISIC/2012/008. ... We acknowledge projects CYTED-Nanoenerga, PAPIIT-IN106912 (UNAM-Mxico), and CONACyT-153270 (Mxico) for financial support. ... Quantum dot-sensitized solar cells (QDSSCs) are interesting energy devices because of their (i) impressive ability to harvest sunlight and generate multiple electron/hole pairs, (ii) ease of fabrication, and (iii) low cost. ...

Mauricio Solis de la Fuente; Rafael S. Snchez; Victoria Gonzlez-Pedro; Pablo P. Boix; S. G. Mhaisalkar; Marina E. Rincn; Juan Bisquert; Ivn Mora-Ser

2013-04-12T23:59:59.000Z

377

Dry Dilution Refrigerator for Experiments on Quantum Effects in the Microwave Regime  

E-Print Network (OSTI)

At the Walther-Mei{\\ss}ner-Institut (WMI), a new cryogen-free 3He/4He dilution refrigerator (DR) has been completed; the cryostat will be employed to cool experiments on superconducting quantum circuits for quantum information technology and quantum simulations. All major components have been made at the WMI. The DR offers lots of space at the various stages of the apparatus for microwave components and cables. E. g., the usable space at the mixing chamber has a height of more than 60 cm and a diameter of 30 cm (mixing chamber mounting plate). To cool cables and cold amplifiers, the DR is equipped with a separate 4He-1K-loop which offers a cooling power of up to 100 mW near 1K. The refrigeration power of the still is 18 mW at 0.9 K; the diameter of its mounting plate is 35 cm. The cryostat rests in an aluminum trestle on air springs to attenuate building vibrations. It is precooled by a Cryomech PT410-RM pulse tube cryocooler (PTC) which is mechanically decoupled from the vacuum can of the cryostat by a bello...

Marx, A; Uhlig, K

2014-01-01T23:59:59.000Z

378

Bernoulli's formula and Poisson's equations for a confined quantum gas: Effects due to a moving piston  

E-Print Network (OSTI)

We study a nonequilibrium equation of states of an ideal quantum gas confined in the cavity under a moving piston with a small but finite velocity in the case that the cavity wall suddenly begins to move at time origin. Confining to the thermally-isolated process, quantum non-adiabatic (QNA) contribution to Poisson's adiabatic equations and to Bernoulli's formula which bridges the pressure and internal energy is elucidated. We carry out a statistical mean of the non-adiabatic (time-reversal-symmetric) force operator found in our preceding paper (K. Nakamura et al, Phys. Rev. E Vol.83, 041133, (2011)) in both the low-temperature quantum-mechanical and high temperature quasi-classical regimes. The QNA contribution, which is proportional to square of the piston's velocity and to inverse of the longitudinal size of the cavity, has a coefficient dependent on temperature, gas density and dimensionality of the cavity. The investigation is done for a unidirectionally-expanding 3-d rectangular parallelepiped cavity as well as its 1-d version. Its relevance in a realistic nano-scale heat engine is discussed.

Katsuhiro Nakamura; Zarifboy A. Sobirov; Davron U. Matrasulov; Sanat K. Avazbaev

2012-12-25T23:59:59.000Z

379

Echo of the Quantum Bounce  

E-Print Network (OSTI)

We identify a signature of quantum gravitational effects that survives from the early universe to the current era: Fluctuations of quantum fields as seen by comoving observers are significantly influenced by the history of the early universe. In particular we show how the existence (or not) of a quantum bounce leaves a trace in the background quantum noise that is not damped and would be non-negligible even nowadays. Furthermore, we estimate an upper bound for the typical energy and length scales where quantum effects are relevant. We discuss how this signature might be observed and therefore used to build falsifiability tests of quantum gravity theories.

Luis J. Garay; Mercedes Martin-Benito; Eduardo Martin-Martinez

2014-02-15T23:59:59.000Z

380

Instantaneous Quantum Computation  

E-Print Network (OSTI)

We examine theoretic architectures and an abstract model for a restricted class of quantum computation, called here instantaneous quantum computation because it allows for essentially no temporal structure within the quantum dynamics. Using the theory of binary matroids, we argue that the paradigm is rich enough to enable sampling from probability distributions that cannot, classically, be sampled from efficiently and accurately. This paradigm also admits simple interactive proof games that may convince a skeptic of the existence of truly quantum effects. Furthermore, these effects can be created using significantly fewer qubits than are required for running Shor's Algorithm.

Dan Shepherd; Michael J. Bremner

2008-09-04T23:59:59.000Z

Note: This page contains sample records for the topic "quantum hall effect" 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

The Honorable,Edward Rendell, '. City Hall  

Office of Legacy Management (LM)

I:! i394 I:! i394 .\ . The Honorable,Edward Rendell, '. City Hall Philadelphia, Pennsylvania 19107 Dear Mayor Rendell : ', ,' . , Secretary of Energy Hazel O',teary has announced-a new approach.to.openness in the Department of Energy (DDE) and its communications with the public. . In support of this initiative, we are.pleased to forward the enclosed information related to the,former. Penn Salt Manufacturing' Co. site in your jurisdiction that performed.work for DOE or its predecessor agencies. This information is provided for yqur information,~use, and retention. _- DOE's~ Formerly~;Utili,zed Sites Remedial Action Program is responsible for '. identification of sites used by DOE's predecessor agencies, determining their current radiologic,al condition and, where it has aut.hori,ty;performing

382

On the quantum effects on noncollinear Lagrangian points and displaced periodic orbits in the Earth-Moon system  

E-Print Network (OSTI)

Recent work in the literature has shown that the leading long distance quantum corrections to the Newtonian potential imply tiny but observable effects in the restricted three-body problem of celestial mechanics, i.e., at the Lagrangian libration points of stable equilibrium the planetoid is not exactly at equal distance from the two bodies of large mass, but the Newtonian values of its coordinates are changed by a few millimeters in the Earth-Moon system. First, we assess such a theoretical calculation by exploiting the full theory of the quintic equation, i.e., its reduction to Bring-Jerrard form and the resulting expression of roots in terms of generalized hypergeometric functions. By performing the numerical analysis of the exact formulas for the roots, we confirm and slightly improve the theoretical evaluation of quantum corrected coordinates of Lagrangian libration points of stable equilibrium. Second, we discuss the prospects to measure, with the help of laser ranging, the above departure from the equilateral triangle picture, which is a challenging task. On the other hand, a modern version of the planetoid is the solar sail, and much progress has been made, in recent years, on the displaced periodic orbits of solar sails at all libration points, both stable and unstable. The present paper investigates therefore, eventually, a restricted three-body problem involving Earth, Moon and a solar sail. By taking into account the quantum corrections to the Newtonian potential, displaced periodic orbits of the solar sail at libration points are again found to exist.

Emmanuele Battista; Simone Dell'Agnello; Giampiero Esposito; Jules Simo

2015-01-12T23:59:59.000Z

383

Parametric Investigations of Miniaturized Cylindrical and Annular Hall Thrusters  

SciTech Connect

A cylindrical geometry Hall thruster may overcome certain physical and technological limitations in scaling down of Hall thrusters to miniature sizes. The absence of the inner wall and use of the cusp magnetic field can potentially reduce heating of the thruster parts and erosion of the channel. A 2.6 cm miniaturized Hall thruster of a flexible design was built and successfully operated in the power range of 50-300 W. Comparison of preliminary results obtained for cylindrical and annular thruster configurations is presented.

A. Smirnov; Y. Raitses; N.J. Fisch

2001-10-16T23:59:59.000Z

384

Description of plasma focus current sheath as the Turner relaxed state of a Hall magnetofluid  

SciTech Connect

The central mystery of plasma focus research is the two orders-of-magnitude-higher-than-thermal fusion reaction rate and the fact that both the space-resolved neutron spectra and space-resolved reaction proton spectra show features which can be ascribed only to a rotational motion of the center-of-mass of the reacting deuteron population. It has been suggested earlier [S. K. H. Auluck, IEEE Trans. Plasma Sci. 25, 37 (1997)] that this and other experimental observations can be consistently explained in terms of a hypothesis involving rotation of the current carrying plasma annulus behind the imploding gas-dynamic shock. Such rotation (more generally, mass flow) is an in-built feature of relaxed state of a two-fluid plasma [R. N. Sudan, Phys. Rev. Lett. 42, 1277 (1979)]. Relaxation in the 'Hall magnetofluid' approximation, in which the generalized Ohm's law includes the Hall effect term and the magnetic convection term but omits the contributions to the electric field from resistive dissipation, electron pressure gradient, thermoelectric effect, electron inertia, etc., has been extensively studied by many authors. In the present paper, Turner's [IEEE Trans. Plasma Sci. PS-14, 849 (1986)] degenerate solution for the relaxed state of the Hall magnetohydrodynamic plasma has been adapted to the case of an infinitely long annular current carrying plasma, a tractable idealization of the current sheath of a plasma focus. The resulting model is consistent with experimental values of ion kinetic energy and observation of predominantly radially directed neutron emission in good shots.

Auluck, S. K. H. [Advanced Technology Systems Section, Bhabha Atomic Research Centre, Mumbai 400085 (India)

2009-12-15T23:59:59.000Z

385

Spin-polarization and spin-dependent logic gates in a double quantum ring based on Rashba spin-orbit effect: Non-equilibrium Green's function approach  

SciTech Connect

Spin-dependent electron transport in an open double quantum ring, when each ring is made up of four quantum dots and threaded by a magnetic flux, is studied. Two independent and tunable gate voltages are applied to induce Rashba spin-orbit effect in the quantum rings. Using non-equilibrium Green's function formalism, we study the effects of electron-electron interaction on spin-dependent electron transport and show that although the electron-electron interaction induces an energy gap, it has no considerable effect when the bias voltage is sufficiently high. We also show that the double quantum ring can operate as a spin-filter for both spin up and spin down electrons. The spin-polarization of transmitted electrons can be tuned from ?1 (pure spin-down current) to +1 (pure spin-up current) by changing the magnetic flux and/or the gates voltage. Also, the double quantum ring can act as AND and NOR gates when the system parameters such as Rashba coefficient are properly adjusted.

Eslami, Leila, E-mail: Leslami@iust.ac.ir; Esmaeilzadeh, Mahdi, E-mail: mahdi@iust.ac.ir [Department of Physics, Iran University of Science and Technology, Tehran 16846 (Iran, Islamic Republic of)

2014-02-28T23:59:59.000Z

386

Quantum Thermometry  

E-Print Network (OSTI)

In this review article we revisit and spell out the details of previous work on how Berry phase can be used to construct a precision quantum thermometer. An important advantage of such a scheme is that there is no need for the thermometer to acquire thermal equilibrium with the sample. This reduces measurement times and avoids precision limitations. We also review how such methods can be used to detect the Unruh effect.

Robert B. Mann; Eduardo Martin-Martinez

2014-05-22T23:59:59.000Z

387

Quantum statistical effect on ionizing collisions of ultracold metastable Kr isotopes  

Science Journals Connector (OSTI)

Ultracold ionizing collisions of laser-cooled Kr isotopes in the 1s5[4p55s:3P2] metastable state are investigated. When the collision energy is reduced below the p-wave centrifugal barrier of 80 ?K, the ratio of the ionizing collision rate between polarized and unpolarized Kr83 atoms is found to decrease. This is a direct evidence of the quantum interference of two identical Fermi particles. The experimental results are compared with the calculation based on the simplified inelastic collision theory.

Hidetoshi Katori; Hideyuki Kunugita; Tetsuya Ido

1995-12-01T23:59:59.000Z

388

Effect of internal electric field on InAs/GaAs quantum dot solar cells  

SciTech Connect

We studied time-resolved carrier recombination in InAs/GaAs quantum dot (QD) solar cells. The electric field in a p-i-n diode structure spatially separates photoexcited carriers in QDs, strongly affecting the conversion efficiency of intermediate-band solar cells. The radiative decay lifetime is dramatically reduced in a strong electric field (193?kV/cm) by efficient recombination due to strong carrier localization in each QD and significant tunneling-assisted electron escape. Conversely, an electric field of the order of 10?kV/cm maintains electronic coupling in the stacked QDs and diminishes tunneling-assisted electron escape.

Kasamatsu, Naofumi; Kada, Tomoyuki; Hasegawa, Aiko; Harada, Yukihiro; Kita, Takashi [Department of Electrical and Electronic Engineering, Graduate School of Engineering, Kobe University, 1-1 Rokkodai, Nada, Kobe 657-8501 (Japan)

2014-02-28T23:59:59.000Z

389

Buckled nano rod - a two state system: quantum effects on its dynamics  

E-Print Network (OSTI)

We consider a suspended elastic rod under longitudinal compression. The compression can be used to adjust potential energy for transverse displacements from harmonic to double well regime. The two minima in potential energy curve describe two possible buckled states. Using transition state theory (TST) we have calculated the rate of conversion from one state to other. If the strain $\\epsilon = 4 \\epsilon_c$ the simple TST rate diverges. We suggest a method to correct this divergence for quantum calculations. We also find that zero point energy contributions can be quite large so that single mode calculations can lead to large errors in the rate.

Aniruddha Chakraborty

2011-07-18T23:59:59.000Z

390

Quantum Tetrahedra  

E-Print Network (OSTI)

We discuss in details the role of Wigner 6j symbol as the basic building block unifying such different fields as state sum models for quantum geometry, topological quantum field theory, statistical lattice models and quantum computing. The apparent twofold nature of the 6j symbol displayed in quantum field theory and quantum computing -a quantum tetrahedron and a computational gate- is shown to merge together in a unified quantum-computational SU(2)-state sum framework.

Mauro Carfora; Annalisa Marzuoli; Mario Rasetti

2010-01-25T23:59:59.000Z

391

Photoinduced Surface Oxidation and Its Effect on the Exciton Dynamics of CdSe Quantum Dots  

SciTech Connect

With increased interest in semiconductor nanoparticles for use in quantum dot solar cells there comes a need to understand the long-term photostability of such materials. Colloidal CdSe quantum dots (QDs) were suspended in toluene and stored in combinations of light/dark and N{sub 2}/O{sub 2} to simulate four possible benchtop storage environments. CdSe QDs stored in a dark, oxygen-free environment were observed to better retain their optical properties over the course of 90 days. The excited state lifetimes, determined through femtosecond transient absorption spectroscopy, of air-equilibrated samples exposed to light exhibit a decrease in average lifetime (0.81 ns) when compared to samples stored in a nitrogen/dark environment (8.3 ns). A photoetching technique commonly used for controlled reduction of QD size was found to induce energetic trap states to CdSe QDs and accelerate the rate of electron-hole recombination. X-ray absorption near edge structure (XANES) analysis confirms surface oxidation, the extent of which is shown to be dependent on the thickness of the ligand shell.

Hines, Douglas A.; Becker, Matthew A.; Kamat, Prashant V. (Notre)

2012-11-14T23:59:59.000Z

392

Quantum correlation via quantum coherence  

E-Print Network (OSTI)

Quantum correlation includes quantum entanglement and quantum discord. Both entanglement and discord have a common necessary condition--------quantum coherence or quantum superposition. In this paper, we attempt to give an alternative understanding of how quantum correlation is related to quantum coherence. We divide the coherence of a quantum state into several classes and find the complete coincidence between geometric (symmetric and asymmetric) quantum discords and some particular classes of quantum coherence. We propose a revised measure for total coherence and find that this measure can lead to a symmetric version of geometric quantum correlation which is analytic for two qubits. In particular, this measure can also arrive at a monogamy equality on the distribution of quantum coherence. Finally, we also quantify a remaining type of quantum coherence and find that for two qubits it is directly connected with quantum nonlocality.

Chang-shui Yu; Yang Zhang; Haiqing Zhao

2014-02-19T23:59:59.000Z

393

Development of multicomponent hybrid density functional theory with polarizable continuum model for the analysis of nuclear quantum effect and solvent effect on NMR chemical shift  

SciTech Connect

We have developed the multicomponent hybrid density functional theory [MC-(HF+DFT)] method with polarizable continuum model (PCM) for the analysis of molecular properties including both nuclear quantum effect and solvent effect. The chemical shifts and H/D isotope shifts of the picolinic acid N-oxide (PANO) molecule in chloroform and acetonitrile solvents are applied by B3LYP electron exchange-correlation functional for our MC-(HF+DFT) method with PCM (MC-B3LYP/PCM). Our MC-B3LYP/PCM results for PANO are in reasonable agreement with the corresponding experimental chemical shifts and isotope shifts. We further investigated the applicability of our method for acetylacetone in several solvents.

Kanematsu, Yusuke; Tachikawa, Masanori [Quantum Chemistry Division, Yokohama City University, Seto 22-2, Kanazawa-ku, Yokohama 236-0027 (Japan)] [Quantum Chemistry Division, Yokohama City University, Seto 22-2, Kanazawa-ku, Yokohama 236-0027 (Japan)

2014-04-28T23:59:59.000Z

394

Missed the Town Hall with Secretary Chu? | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Missed the Town Hall with Secretary Chu? Missed the Town Hall with Secretary Chu? Missed the Town Hall with Secretary Chu? January 31, 2011 - 11:40am Addthis Ginny Simmons Ginny Simmons Former Managing Editor for Energy.gov, Office of Public Affairs Editor's Note: This entry has been cross-posted from DOE's Energy Blog. We have the video of the online town hall event with Secretary Chu up and ready for your viewing. Check it out below. During the event, Secretary Chu highlighted several parts of the President Obama's clean energy and innovation agenda: Ending taxpayer subsidies for fossil fuels so we can increase our investments in clean energy by a third; Creating three new Energy Innovation Hubs; Putting one million advanced technology vehicles on the road by 2015; A "Sun Shot" initiative to make solar energy cost-competitive with

395

Town Hall with Secretary Moniz | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Town Hall with Secretary Moniz Town Hall with Secretary Moniz Town Hall with Secretary Moniz July 18, 2013 - 3:42pm Addthis Secretary Moniz speaks at a townhall with DOE employees on the Departmental reorganization. Dan Leistikow Dan Leistikow Former Director, Office of Public Affairs In a town hall meeting with Department staff, Energy Secretary Ernest Moniz spoke about his plans for a reorganization of the Energy Department's management structure. The plans will help better achieve the Department's key priorities and those of the President, including implementing the President's Climate Action Plan, "all of the above" energy strategy and nuclear security agenda. After his remarks, Moniz, joined by Deputy Secretary Dan Poneman, took questions from the audience in the Forrestal Auditorium as well as email

396

NE-24 Gilman Hall, University of California, Certification Documentation  

Office of Legacy Management (LM)

Gilman Hall, University of California, Gilman Hall, University of California, Certification Documentation Berkeley, California, Conditional Verlette Gatlin, MA-232 I am attaching for entry into the Public Document Room, two copies of the subject documentation. These documents are the backup data for the conditional certification that the site is radiologically acceptable for restricted use as noted in the certification statement published in the Federal Register. Inasmuch as the conditional certification is made public through the Federal Register, it is prudent that the attached backup documentation also be available to the public. The docket consists of: 1. Introduction: Introduction to the certification docket for Gilman Hall, University of California, Berkeley, California. 2. Exhibit I: Summary of activities at Gilman Hall, University of

397

Sec. Chu Online Town Hall | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Online Town Hall Online Town Hall Sec. Chu Online Town Hall Addthis Description Secretary Steven Chu hosted an online town hall to discuss the clean energy and innovation agenda President Obama laid out in his 2011 State of the Union address. (January 26, 2011) Speakers Secretary Steven Chu Duration 51:59 Topic Tax Credits, Rebates, Savings Energy Sources Energy Economy Credit Energy Department Video SECRETARY STEVEN CHU: All right, thank you. I'd like to first thank you for being here and all those out there in ether-land, cyberspace also, for joining us. I just want to briefly make a couple comments before handing it over to questions. Last night, President Obama laid out strategy for America to create jobs and win the future, and there were central themes going throughout his

398

Hall viscosity and angular momentum in gapless holographic models  

E-Print Network (OSTI)

We use the holographic approach to compare the Hall viscosity ?[subscript H] and the angular momentum density J in gapless systems in 2 + 1 dimensions at finite temperature. We start with a conformal fixed point and turn ...

Liu, Hong

399

The Rockefeller University Office of Technology Transfer 502 Founders Hall  

E-Print Network (OSTI)

The Rockefeller University Office of Technology Transfer 502 Founders Hall 1230 York Avenue New(19):4355-4364 Nidhi Sabharwal, Ph.D. Technology Manager Office of Technology Transfer (212) 327-7092 nsabharwal

400

The Rockefeller University Office of Technology Transfer 502 Founders Hall  

E-Print Network (OSTI)

The Rockefeller University Office of Technology Transfer 502 Founders Hall 1230 York Avenue New, Ph.D. Technology Manager Office of Technology Transfer (212) 327-7092 nsabharwal@rockefeller.edu #12;

de Lange, Titia

Note: This page contains sample records for the topic "quantum hall effect" 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

The Rockefeller University Office of Technology Transfer 502 Founders Hall  

E-Print Network (OSTI)

The Rockefeller University Office of Technology Transfer 502 Founders Hall 1230 York Avenue New Sabharwal, Ph.D. Technology Manager Office of Technology Transfer (212) 327-7092 nsabharwal

402

The Rockefeller University Office of Technology Transfer 502 Founders Hall  

E-Print Network (OSTI)

The Rockefeller University Office of Technology Transfer 502 Founders Hall 1230 York Avenue New,383,370. Tari Suprapto, Ph.D. Assistant Director Technology Transfer (212) 327-7095 tsuprapto

403

The Rockefeller University Office of Technology Transfer 502 Founders Hall  

E-Print Network (OSTI)

The Rockefeller University Office of Technology Transfer 502 Founders Hall 1230 York Avenue New,049,814 · US Patent 8,553,143 Nidhi Sabharwal, Ph.D. Technology Manager Technology Transfer (212) 327

404

The Rockefeller University Office of Technology Transfer 502 Founders Hall  

E-Print Network (OSTI)

The Rockefeller University Office of Technology Transfer 502 Founders Hall 1230 York Avenue New.D. Assistant Director Technology Transfer (212) 327-7095 tsuprapto@rockefeller.edu #12;

405

The Rockefeller University Office of Technology Transfer 502 Founders Hall  

E-Print Network (OSTI)

The Rockefeller University Office of Technology Transfer 502 Founders Hall 1230 York Avenue New.1016/j.jmb.2008.01.066 Tari Suprapto, Ph.D. Assistant Director Technology Transfer (212) 327

406

Experimental and theoretical characterization of a Hall thruster plume  

E-Print Network (OSTI)

Despite the considerable flight heritage of the Hall thruster, the interaction of its plume with the spacecraft remains an important integration issue. Because in-flight data fully characterizing the plume in the space ...

Azziz, Yassir, 1979-

2007-01-01T23:59:59.000Z

407

TBH-0042- In the Matter of Curtis Hall  

Energy.gov (U.S. Department of Energy (DOE))

This Initial Agency Decision involves a whistleblower complaint filed by Mr. Curtis Hall (also referred to as the complainant or the individual) under the Department of Energy (DOE) Contractor...

408

Public invited to LANL-sponsored Energy Town Hall  

NLE Websites -- All DOE Office Websites (Extended Search)

Energy Town Hall April 21 at the J. Robert Oppenheimer Study Center LOS ALAMOS, New Mexico, April 19, 2010-The public is invited to learn about projects in energy conservation,...

409

Residence Hall Handbook Policies, Regulations, and Standards of Conduct  

E-Print Network (OSTI)

, educational community does not tolerate physical or psychological threats, harassment, intimidation1 Residence Hall Handbook Policies, Regulations, and Standards of Conduct Updated August 20, 2012 community member who works, lives, studies, teaches, does research, conducts business or is involved

Stowell, Michael

410

Residence Hall Handbook Policies, Regulations, and Standards of Conduct  

E-Print Network (OSTI)

, educational community does not tolerate physical or psychological threats, harassment, intimidation1 Residence Hall Handbook Policies, Regulations, and Standards of Conduct As members community member who works, lives, studies, teaches, does research, conducts business or is involved

Vasilyev, Oleg V.

411

SubTER Presentation at Town Hall- American Geophysical Union  

Energy.gov (U.S. Department of Energy (DOE))

Subter, the Subsurface Crosscut at the Energy Department, conducted a Town Hall meeting to share information and create a dialogue regarding the grand challenges of energy production and storage in the subsurface.

412

Operating parameters and oscillation characteristics of an anode-layer Hall thruster with argon propellant  

Science Journals Connector (OSTI)

Abstract Currently, the propellant most often used in Hall effect thrusters is xenon and in recent years occasionally krypton. However, both noble gases are extremely scarce on Earth and missions with high propellant demand, e.g., high-power operation, are defied due to the limited annual production. Therefore, alternative abundant propellants like argon need to be considered. In this paper, the operation characteristics of the anode-layer Hall thruster (TAL) UT-58 with argon propellant are evaluated. Further, the guidelines of high-power operation with argon propellant have been investigated by discussing the discharge stability in each propellant using the same performance map. Finally, it is shown by these maps that optimum magnetic lines by magnetic shielding can be applied to the anode-layer Hall thruster with argon propellant. As a result, three regions were determined by comparing the oscillation amplitude using both xenon and argon, and it was discovered that the optimum operating points with argon propellant are in a region with low magnetic flux density.

Daiki Fujita; Rei Kawashima; Yuki Ito; Shohei Akagi; Jun Suzuki; Tony Schnherr; Hiroyuki Koizumi; Kimiya Komurasaki

2014-01-01T23:59:59.000Z

413

Effect of an in-plane magnetic field on the photoluminescence spectrum of modulation-doped quantum wells and heterojunctions  

Science Journals Connector (OSTI)

The photoluminescence (PL) spectrum of modulation-doped GaAs?AlGaAs quantum wells and heterojunctions (HJ) is studied under a magnetic field (B?) applied parallel to the two-dimensional electron gas (2DEG) layer. The effect of B? strongly depends on the electron-hole separation, and we revealed remarkable B?-induced modifications of the PL spectra in both types of heterostructures. A model considering the direct optical transitions between the conduction and valence subbands that are shifted in k-space under B?, accounts qualitatively for the observed spectral modifications. In the HJs, the 2DEG-hole PL intensity is strongly enhanced relatively to the bulk exciton PL with increasing B?. This means that the distance between the photoholes and the 2DEG decreases with increasing B?, and thus free holes are responsible for the 2DEG-hole PL.

B. M. Ashkinadze, E. Linder, E. Cohen, and L. N. Pfeiffer

2005-01-06T23:59:59.000Z

414

Unitary limit and quantum interference effect in disordered two-dimensional crystals with nearly half-filled bands  

Science Journals Connector (OSTI)

Based on the self-consistent T-matrix approximation, the quantum interference (QI) effects are studied with the diagrammatic technique in weakly disordered two-dimensional crystals with nearly half-filled bands. In addition to the usual 0-mode cooperon and diffuson, there exists ?-mode cooperon and diffuson in the unitary limit due to the particle-hole symmetry. The diffusive ? modes are gapped by the deviation from the exactly nested Fermi surface. The conductivity diagrams with the gapped ?-mode cooperon or diffuson are found to give rise to unconventional features of the QI effects. Besides inelastic scattering, thermal fluctuation is also shown to be an important dephasing mechanism in the QI processes related to the diffusive ? modes. In the proximity of the nesting case, a power-law antilocalization effect appears due to the ?-mode diffuson. For large deviation from the nested Fermi surface, this antilocalization effect is suppressed, and the conductivity remains to have the usual logarithmic weak-localization correction contributed by the 0-mode cooperon. As a result, the dc conductivity in the unitary limit becomes a nonmonotonic function of the temperature or the sample size, which is quite different from the prediction of the usual weak-localization theory.

Y. H. Yang; Y. G. Wang; M. Liu; D. Y. Xing

2003-07-29T23:59:59.000Z

415

Calculation of the electron Hall mobility and Hall scattering factor in 6H-SiC D. Vasileska, and D. K. Schroder  

E-Print Network (OSTI)

Calculation of the electron Hall mobility and Hall scattering factor in 6H-SiC G. Ng,a D. Vasileska results, all of these calculations have either i focused on calculating the electron drift mobility, while significantly from experimental data.10 In this paper a more accurate calculation of the electron Hall mobility

Schroder, Dieter K.

416

Screening effects on field emission from arrays of (5,5) carbon nanotubes: Quantum mechanical simulations  

Science Journals Connector (OSTI)

The simulation of field electron emission from arrays of micrometer-long open-ended (5,5) carbon nanotubes is performed in the framework of quantum theory of many electrons. It is found that the applied external field is strongly screened when the spacing distance is shorter than the length of the carbon nanotubes. The optimal spacing distance is two to three times of the nanotube length, slightly depending on the applied external fields. The electric screening can be described by a factor that is an exponential function of the ratio of the spacing distance to the length of the carbon nanotubes. For a given length, the field enhancement factor decreases sharply as the screening factor is larger than 0.05. The simulation implies that the thickness of the array should be larger than a value, but it does not help the emission much by increasing the thickness a great deal.

Guihua Chen; Weiliang Wang; Jie Peng; Chunshan He; Shaozhi Deng; Ningsheng Xu; Zhibing Li

2007-11-13T23:59:59.000Z

417

Quantum field theory in curved graphene spacetimes, Lobachevsky geometry, Weyl symmetry, Hawking effect, and all that  

E-Print Network (OSTI)

The solutions of many issues, of the ongoing efforts to make deformed graphene a tabletop quantum field theory in curved spacetimes, are presented. A detailed explanation of the special features of curved spacetimes, originating from embedding portions of the Lobachevsky plane into $\\mathbf{R}^3$, is given, and the special role of coordinates for the physical realizations in graphene, is explicitly shown, in general, and for various examples. The Rindler spacetime is reobtained, with new important differences with respect to earlier results. The de Sitter spacetime naturally emerges, for the first time, paving the way to future applications in cosmology. The role of the BTZ black hole is also briefly addressed. The singular boundary of the pseudospheres, "Hilbert horizon", is seen to be closely related to event horizon of the Rindler, de Sitter, and BTZ kind. This gives new, and stronger, arguments for the Hawking phenomenon to take place. An important geometric parameter, $c$, overlooked in earlier work, takes here its place for physical applications, and it is shown to be related to graphene's lattice spacing, $\\ell$. It is shown that all surfaces of constant negative curvature, ${\\cal K} = -r^{-2}$, are unified, in the limit $c/r \\to 0$, where they are locally applicable to the Beltrami pseudosphere. This, and $c = \\ell$, allow us a) to have a phenomenological control on the reaching of the horizon; b) to use spacetimes different than Rindler for the Hawking phenomenon; c) to approach the generic surface of the family. An improved expression for the thermal LDOS is obtained. A non-thermal term for the total LDOS is found. It takes into account: a) the peculiarities of the graphene-based Rindler spacetime; b) the finiteness of a laboratory surface; c) the optimal use of the Minkowski quantum vacuum, through the choice of this Minkowski-static boundary.

Alfredo Iorio; Gaetano Lambiase

2014-12-15T23:59:59.000Z

418

Quantum motor and future  

E-Print Network (OSTI)

In a popular language, the possibilities of the Casimir expulsion effect are presented, which can be the basis of quantum motors. Such motors can be in the form of a special multilayer thin film with periodic and complex nanosized structures. Quantum motors of the type of the Casimir platforms can be the base of transportation, energy and many other systems in the future.

Fateev, Evgeny G

2013-01-01T23:59:59.000Z

419

Quantum motor and future  

E-Print Network (OSTI)

In a popular language, the possibilities of the Casimir expulsion effect are presented, which can be the basis of quantum motors. Such motors can be in the form of a special multilayer thin film with periodic and complex nanosized structures. Quantum motors of the type of the Casimir platforms can be the base of transportation, energy and many other systems in the future.

Evgeny G. Fateev

2013-01-20T23:59:59.000Z

420

Quantum Spacetime Phenomenology  

E-Print Network (OSTI)

I review the current status of phenomenological programs inspired by quantum-spacetime research. I stress in particular the significance of results establishing that certain data analyses provide sensitivity to effects introduced genuinely at the Planck scale. And my main focus is on phenomenological programs that managed to affect the directions taken by studies of quantum-spacetime theories.

Giovanni Amelino-Camelia

2013-06-18T23:59:59.000Z

Note: This page contains sample records for the topic "quantum hall effect" 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

Strong reactions in quantum super PDEs. III: Exotic quantum supergravity  

E-Print Network (OSTI)

Following the previous two parts, of a work devoted to encode strong reaction dynamics in the A. Pr\\'astaro's algebraic topology of quantum super PDE's, nonlinear quantum propagators in the observed quantum super Yang-Mills PDE, $\\hat{(YM)}[i]$, are further characterized. In particular, nonlinear quantum propagators with non-zero defect quantum electric-charge, are interpreted as {\\em exotic-quantum supergravity} effects. As an application, the recently discovered bound-state called $Zc(3900)$, is obtained as a neutral quasi-particle, generated in a $Q$-quantum exotic supergravity process. {\\em Quantum entanglement} is justified by means of the algebraic topologic structure of nonlinear quantum propagators. Quantum Cheshire cats are considered as examples of quantum entanglements. Existence theorem for solutions of $\\hat{(YM)}[i]$ admitting negative local temperatures ({\\em quantum thermodynamic-exotic solutions}) is obtained too and related to quantum entanglement. Such exotic solutions are used to encode Universe at the Planck-epoch. It is proved that the Universe's expansion at the Planck epoch is justified by the fact that it is encoded by a nonlinear quantum propagator having thermodynamic quantum exotic components in its boundary. This effect produces also an increasing of energy in the Universe at the Einstein epoch: {\\em Planck-epoch-legacy} on the boundary of our Universe. This is the main source of the Universe's expansion and solves the problem of the non-apparent energy-matter ({\\em dark-energy-matter}) in the actual Universe. Breit-Wheeler-type processes have been proved in the framework of the Pr\\'astaro's algebraic topology of quantum super Yang-Mills PDEs. Numerical comparisons of nonlinear quantum propagators with Weinberg-Salam electroweak theory in Standard Model are given.

Agostino Prstaro

2015-02-01T23:59:59.000Z

422

Quantum Institute  

NLE Websites -- All DOE Office Websites (Extended Search)

Quantum Institute Quantum Institute Quantum Institute A new research frontier awaits! Our door is open and we thrive on mutually beneficial partnerships, collaborations that drive innovations and new technologies. Contact Leader Malcolm Boshier (505) 665-8892 Email Two of LANL's most successful quantum technology initiatives: quantum cryptography and the race for quantum computer The area of quantum information, science, and technology is rapidly evolving, with important applications in the areas of quantum cryptography, quantum computing, quantum metrology, and advanced quantum-based sensors, some of which are directly relevant to the Laboratory's national security mission. Mission Foster a vigorous intellectual environment at LANL Define and develop strategic thrusts Target and pursue funding opportunities

423

Quantum Simulation  

E-Print Network (OSTI)

Simulating quantum mechanics is known to be a difficult computational problem, especially when dealing with large systems. However, this difficulty may be overcome by using some controllable quantum system to study another less controllable or accessible quantum system, i.e., quantum simulation. Quantum simulation promises to have applications in the study of many problems in, e.g., condensed-matter physics, high-energy physics, atomic physics, quantum chemistry and cosmology. Quantum simulation could be implemented using quantum computers, but also with simpler, analog devices that would require less control, and therefore, would be easier to construct. A number of quantum systems such as neutral atoms, ions, polar molecules, electrons in semiconductors, superconducting circuits, nuclear spins and photons have been proposed as quantum simulators. This review outlines the main theoretical and experimental aspects of quantum simulation and emphasizes some of the challenges and promises of this fast-growing field.

I. M. Georgescu; S. Ashhab; Franco Nori

2014-03-13T23:59:59.000Z

424

An Invisible Quantum Tripwire  

E-Print Network (OSTI)

We present here a quantum tripwire, which is a quantum optical interrogation technique capable of detecting an intrusion with very low probability of the tripwire being revealed to the intruder. Our scheme combines interaction-free measurement with the quantum Zeno effect in order to interrogate the presence of the intruder without interaction. The tripwire exploits a curious nonlinear behaviour of the quantum Zeno effect we discovered, which occurs in a lossy system. We also employ a statistical hypothesis testing protocol, allowing us to calculate a confidence level of interaction-free measurement after a given number of trials. As a result, our quantum intruder alert system is robust against photon loss and dephasing under realistic atmospheric conditions and its design minimizes the probabilities of false positives and false negatives as well as the probability of becoming visible to the intruder.

Petr M. Anisimov; Daniel J. Lum; S. Blane McCracken; Hwang Lee; Jonathan P. Dowling

2010-02-17T23:59:59.000Z

425

New Regulators for Quantum Field Theories with Compactified Extra Dimensions. II: Ultraviolet Finiteness and Effective Field Theory Implementation  

E-Print Network (OSTI)

In a previous companion paper [arXiv:0712.3532], we proposed two new regulators for quantum field theories in spacetimes with compactified extra dimensions. Unlike most other regulators which have been used in the extra-dimension literature, these regulators are specifically designed to respect the original higher-dimensional Lorentz and gauge symmetries that exist prior to compactification, and not merely the four-dimensional symmetries which remain afterward. In this paper, we use these regulators in order to develop a method for extracting ultraviolet-finite results from one-loop calculations. This method also allows us to derive Wilsonian effective field theories for Kaluza-Klein modes at different energy scales. Our method operates by ensuring that divergent corrections to parameters describing the physics of the excited Kaluza-Klein modes are absorbed into the corresponding parameters for zero modes, thereby eliminating the need to introduce independent counterterms for parameters characterizing different Kaluza-Klein modes. Our effective field theories can therefore simplify calculations involving Kaluza-Klein modes, and be compared directly to potential experimental results emerging from collider data.

Sky Bauman; Keith R. Dienes

2008-01-27T23:59:59.000Z

426

Hall's Warehouse Corp Solar Project | Open Energy Information  

Open Energy Info (EERE)

Hall's Warehouse Corp Solar Project Hall's Warehouse Corp Solar Project Jump to: navigation, search Name Hall's Warehouse Corp Solar Project Facility Hall's Warehouse Corporation Solar Project Sector Solar Facility Type Thin Film (First Solar) and Amorphous Silicon Thin Film Laminate (UNI-SOLAR Laminates) Owner EnXco Developer EnXco Energy Purchaser Hall's Warehouse Corporation Address 501 Kentile Road Location South Plainfield, NJ Coordinates 40.5728254°, -74.4002111° 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":40.5728254,"lon":-74.4002111,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

427

Classical and Quantum Polyhedra  

E-Print Network (OSTI)

Quantum polyhedra constructed from angular momentum operators are the building blocks of space in its quantum description as advocated by Loop Quantum Gravity. Here we extend previous results on the semiclassical properties of quantum polyhedra. Regarding tetrahedra, we compare the results from a canonical quantization of the classical system with a recent wave function based approach to the large-volume sector of the quantum system. Both methods agree in the leading order of the resulting effective operator (given by an harmonic oscillator), while minor differences occur in higher corrections. Perturbative inclusion of such corrections improves the approximation to the eigenstates. Moreover, the comparison of both methods leads also to a full wave function description of the eigenstates of the (square of the) volume operator at negative eigenvalues of large modulus. For the case of general quantum polyhedra described by discrete angular momentum quantum numbers we formulate a set of quantum operators fulfilling in the semiclassical regime the standard commutation relations between momentum and position. Differently from previous formulations, the position variable here is chosen to have dimension of (Planck) length squared which facilitates the identification of quantum corrections. Finally, we provide expressions for the pentahedral volume in terms of Kapovich-Millson variables.

John Schliemann

2014-12-11T23:59:59.000Z

428

PUBLISHED ONLINE: 13 JUNE 2010 | DOI: 10.1038/NPHYS1697 Measurement of the effect of quantum phase slips  

E-Print Network (OSTI)

of quantum phase slips in a Josephson junction chain I. M. Pop1 , I. Protopopov2,3 , F. Lecocq1 , Z. Peng1 transition, as has been observed in thin superconduct- ing films5,6 , wires7 and also in Josephson junction in the ground state of a Josephson junction chain. We tune in situ the strength of quantum phase fluctuations

Loss, Daniel

429

Quantum Machines  

E-Print Network (OSTI)

We discuss quantum information processing machines. We start with single purpose machines that either redistribute quantum information or identify quantum states. We then move on to machines that can perform a number of functions, with the function they perform being determined by a program, which is itself a quantum state. Examples of both deterministic and probabilistic programmable machines are given, and we conclude with a discussion of the utility of quantum programs.

Mark Hillery; Vladimir Buzek

2009-03-24T23:59:59.000Z

430

Studies of Novel Quantum Phenomena in Ruthenates  

SciTech Connect

Strongly correlated oxides have been the subject of intense study in contemporary condensed matter physics, and perovskite ruthenates (Sr,Ca)n+1RunO3n+1 have become a new focus in this field. One of important characteristics of ruthenates is that both lattice and orbital degrees of freedom are active and are strongly coupled to charge and spin degrees of freedom. Such a complex interplay of multiple degrees of freedom causes the properties of ruthenates to exhibit a gigantic response to external stimuli under certain circumstances. Magnetic field, pressure, and chemical composition all have been demonstrated to be effective in inducing electronic/magnetic phase transitions in ruthenates. Therefore, ruthenates are ideal candidates for searching for novel quantum phenomena through controlling external parameters. The objective of this project is to search for novel quantum phenomena in ruthenate materials using high-quality single crystals grown by the floating-zone technique, and investigate the underlying physics. The following summarizes our accomplishments. We have focused on trilayered Sr4Ru3O10 and bilayered (Ca1-xSrx)3Ru2O7. We have succeeded in growing high-quality single crystals of these materials using the floating-zone technique and performed systematic studies on their electronic and magnetic properties through a variety of measurements, including resistivity, Hall coefficient, angle-resolved magnetoresistivity, Hall probe microscopy, and specific heat. We have also studied microscopic magnetic properties for some of these materials using neutron scattering in collaboration with Los Alamos National Laboratory. We have observed a number of unusual exotic quantum phenomena through these studies, such as an orbital selective metamagnetic transition, bulk spin valve effect, and a heavy-mass nearly ferromagnetic state with a surprisingly large Wilson ratio. Our work has also revealed underlying physics of these exotic phenomena. Exotic phenomena of correlated electron has been among central topics of contempary condensed matter physics. Ultrfast phase transitions accompanied by switching of conductivity or magnetization in stronly correlated materials are believed to be promising in developing next generation of transistors. Our work on layered ruthenates has remarkably advanced our understanding of how the exotic phenomena of correlated electrons is governed by the complex interplay between charge, spin, lattice and orbital degrees of freedom. In addition to studies on ruthenates, we have also expanded our research to the emerging field of Fe-based superconductors, focusing on the iron chalcogenide Fe1+y(Te1-xSex) superconductor system. We first studied the superconductivity of this alloy system following the discovery of superconductivity in FeSe using polycrystalline samples. Later, we successfuly grew high-quality single crystals of these materials. Using these single crystals, we have determined the magnetic structure of the parent compound Fe1+yTe, observed spin resonance of superconducting state in optimally doped samples, and established a phase diagram. Our work has produced an important impact in this burgeoning field. The PI presented an invited talk on this topic at APS March meeting in 2010. We have published 19 papers in these two areas (one in Nature materials, five in Physical Review Letters, and nine in Physical Review B) and submitted two (see the list of publications attached below).

Mao, Zhiqiang

2011-04-08T23:59:59.000Z

431

Town Hall Meeting #3: Green Button | OpenEI Community  

Open Energy Info (EERE)

Town Hall Meeting #3: Green Button Town Hall Meeting #3: Green Button Home > Groups > OpenEI Community Central Graham7781's picture Submitted by Graham7781(2002) Super contributor 5 June, 2012 - 14:40 imported OpenEI OpenEI would like to thank all those that have participated in the Town Hall Forum thus far. We have been pleased to hear the questions and learn more about how our users leverage OpenEI, and what specifically they would like more of out of the platform. This coming week we'd like to focus on the Green Button Initiative and Green Button data/apps. You can use this time to talk to OpenEI about the Green Button, where the future of Green Button data is headed, where to find information on OpenEI about the Green Button, and what we are doing to provide Green Button data and apps.

432

Reconnection events in two-dimensional Hall magnetohydrodynamic turbulence  

SciTech Connect

The statistical study of magnetic reconnection events in two-dimensional turbulence has been performed by comparing numerical simulations of magnetohydrodynamics (MHD) and Hall magnetohydrodynamics (HMHD). The analysis reveals that the Hall term plays an important role in turbulence, in which magnetic islands simultaneously reconnect in a complex way. In particular, an increase of the Hall parameter, the ratio of ion skin depth to system size, broadens the distribution of reconnection rates relative to the MHD case. Moreover, in HMHD the local geometry of the reconnection region changes, manifesting bifurcated current sheets and quadrupolar magnetic field structures in analogy to laminar studies, leading locally to faster reconnection processes in this case of reconnection embedded in turbulence. This study supports the idea that the global rate of energy dissipation is controlled by the large scale turbulence, but suggests that the distribution of the reconnection rates within the turbulent system is sensitive to the microphysics at the reconnection sites.

Donato, S.; Servidio, S.; Carbone, V. [Dipartimento di Fisica, Universita della Calabria, I-87036 Cosenza (Italy); Dmitruk, P. [Departamento de Fisica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires and Instituto de Fisica de Buenos Aires, CONICET, Buenos Aires (Argentina); Shay, M. A.; Matthaeus, W. H. [Bartol Research Institute and Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716 (United States); Cassak, P. A. [Department of Physics, West Virginia University, Morgantown, West Virginia 26506 (United States)

2012-09-15T23:59:59.000Z

433

Spectroscopy of snake states using a graphene Hall bar  

SciTech Connect

An approach to observe snake states in a graphene Hall bar containing a pn-junction is proposed. The magnetic field dependence of the bend resistance in a ballistic graphene Hall bar structure containing a tilted pn-junction oscillates as a function of applied magnetic field. We show that each oscillation is due to a specific snake state that moves along the pn-interface. Furthermore, depending on the value of the magnetic field and applied potential, we can control the lead in which the electrons will end up and hence control the response of the system.

Milovanovi?, S. P., E-mail: slavisa.milovanovic@gmail.com; Ramezani Masir, M., E-mail: mrmphys@gmail.com; Peeters, F. M., E-mail: francois.peeters@ua.ac.be [Departement Fysica, Universiteit Antwerpen, Groenenborgerlaan 171, B-2020 Antwerpen (Belgium)

2013-12-02T23:59:59.000Z

434

Thermal Hall conductivity of marginal Fermi liquids subject to out-of-plane impurities in high-Tc cuprates  

Science Journals Connector (OSTI)

The effect of out-of-plane impurities on the thermal Hall conductivity ?xy of in-plane marginal-Fermi-liquid (MFL) quasiparticles in high-Tc cuprates is examined by following the work on electrical Hall conductivity ?xy by Varma and Abraham [Phys. Rev. Lett. 86, 4652 (2001)]. It is shown that the effective Lorentz force exerted by these impurities is a weak function of energies of the MFL quasiparticles, resulting in nearly the same temperature dependence of ?xy/T and ?xy, indicative of obedience of the Wiedemann-Franz law. The inconsistency of the theoretical result with the experimental one is speculated to be the consequence of the different amounts of out-of-plane impurities in the two YBaCuO samples used for the ?xy and ?xy measurements.

Mei-Rong Li

2002-04-30T23:59:59.000Z

435

The effect of photo-generated carriers on the spectral diffusion of a quantum dot coupled to a photonic crystal cavity  

E-Print Network (OSTI)

We experimentally observe the effect of photo-generated carriers on the spectral diffusion of a quantum dot (QD) coupled to a photonic crystal (PC) cavity. In this system, spectral diffusion arises in part from charge fluctuations on the etched surfaces of the PC. We find that these fluctuations may be suppressed by photo-generated carriers, leading to a reduction of the measured QD linewidth by a factor of ~2 compared to the case where the photo-generated carriers are not present. This result demonstrates a possible means of countering the effects of spectral diffusion in QD-PC cavity systems and thus may be useful for quantum information applications where narrow QD linewidths are desired.

Arka Majumdar; Erik D. Kim; Jelena Vuckovic

2011-07-24T23:59:59.000Z

436

Jeri Muoio's gun ban at West Palm Beach city hall By ANDREW ABRAMSON  

E-Print Network (OSTI)

Jeri Muoio's gun ban at West Palm Beach city hall draws fire By ANDREW ABRAMSON Palm Beach Post Jeri Muoio might negotiate on some issues, but when it comes to guns in city hall, she holds her ground with a gun," Muoio said at a city commission meeting last month. "If you're coming into city hall, leave your

Belogay, Eugene A.

437

Experimental studies of anode sheath phenomena in a Hall thruster discharge  

E-Print Network (OSTI)

Experimental studies of anode sheath phenomena in a Hall thruster discharge L. Dorf,a Y. Raitses-attracting anode sheaths in a Hall thruster were characterized by measuring the plasma potential with biased in the near-anode region of a Hall thruster with clean and dielectrically coated anodes are identified

438

THE NEW VME-BASED SYSTEM FOR MAGNETIC MEASUREMENTS WITH HALL SENSORS  

E-Print Network (OSTI)

THE NEW VME-BASED SYSTEM FOR MAGNETIC MEASUREMENTS WITH HALL SENSORS A.Batrakov, S.Zverev, I, 630090, Russia Abstract Systems with Hall sensors are widely used for magnetic measurements. The paper for creation of measuring systems with Hall sensors in BINP for many years [1]. These systems had good

Kozak, Victor R.

439

Annual Fire Report Page 1 of 4 Residence Hall/Historic Houses Fire Protection Equipment  

E-Print Network (OSTI)

Annual Fire Report Page 1 of 4 Residence Hall/Historic Houses Fire Protection Equipment 2012 Residence Hall/Historic Houses Fire Protection Equipment 2012 Calendar Year 24 Bull Street Annex-House X X X Calendar Year College of Charleston Residence Halls and Historic Housing Facilities Fire alarm monitoring

Kasman, Alex

440

Page 28 Housing Services Sonoma State University 2012-2013 Catalog Zinfandel Hall  

E-Print Network (OSTI)

its own dining hall, swimming pools, study rooms, convenience store, post office, meeting roomsPage 28 Housing Services Sonoma State University 2012-2013 Catalog Zinfandel Hall (707) 664. The Community is a unique mix of nontraditional resident hall suites and campus apartments, all located just

Ravikumar, B.

Note: This page contains sample records for the topic "quantum hall effect" 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

Page 28 Housing Services Sonoma State University 2011-2012 Catalog Zinfandel Hall  

E-Print Network (OSTI)

its own dining hall, swimming pools, study rooms, convenience store, post office, meeting roomsPage 28 Housing Services Sonoma State University 2011-2012 Catalog Zinfandel Hall (707) 664. The Community is a unique mix of nontraditional resident hall suites and campus apartments, all located just

Ravikumar, B.

442

Description of plasma focus current sheath as the Turner relaxed state of a Hall magnetofluid  

Science Journals Connector (OSTI)

The central mystery of plasma focus research is the two orders-of-magnitude-higher-than-thermal fusion reaction rate and the fact that both the space-resolved neutron spectra and space-resolved reactionproton spectra show features which can be ascribed only to a rotational motion of the center-of-mass of the reacting deuteron population. It has been suggested earlier [S. K. H. Auluck IEEE Trans. Plasma Sci.25 37 (1997)] that this and other experimental observations can be consistently explained in terms of a hypothesis involving rotation of the current carrying plasma annulus behind the imploding gas-dynamic shock. Such rotation (more generally mass flow) is an in-built feature of relaxed state of a two-fluid plasma [R. N. Sudan Phys. Rev. Lett.42 1277 (1979)]. Relaxation in the Hall magnetofluid approximation in which the generalized Ohms law includes the Hall effect term and the magnetic convection term but omits the contributions to the electric field from resistive dissipation electron pressure gradient thermoelectric effect electron inertia etc. has been extensively studied by many authors. In the present paper Turners [IEEE Trans. Plasma Sci.PS-14 849 (1986)] degenerate solution for the relaxed state of the Hall magnetohydrodynamicplasma has been adapted to the case of an infinitely long annular current carrying plasma a tractable idealization of the current sheath of a plasma focus. The resulting model is consistent with experimental values of ion kinetic energy and observation of predominantly radially directed neutron emission in good shots.

S. K. H. Auluck

2009-01-01T23:59:59.000Z

443

Coherent oscillations between two weakly coupled Bose-Einstein Condensates: Josephson effects, $?$-oscillations, and macroscopic quantum self trapping  

E-Print Network (OSTI)

We discuss the coherent atomic oscillations between two weakly coupled Bose-Einstein condensates. The weak link is provided by a laser barrier in a (possibly asymmetric) double-well trap or by Raman coupling between two condensates in different hyperfine levels. The Boson Josephson Junction (BJJ) dynamics is described by the two-mode non-linear Gross-Pitaevskii equation, that is solved analytically in terms of elliptic functions. The BJJ, being a $neutral$, isolated system, allows the investigations of new dynamical regimes for the phase difference across the junction and for the population imbalance, that are not accessible with Superconductor Josephson Junctions (SJJ). These include oscillations with either, or both of the following properties: 1) the time-averaged value of the phase is equal to $\\pi$ ($\\pi-phase$ oscillations); 2) the average population imbalance is nonzero, in states with ``macroscopic quantum self-trapping'' (MQST). The (non-sinusoidal) generalization of the SJJ `ac' and `plasma' oscillations and the Shapiro resonance can also be observed. We predict the collapse of experimental data (corresponding to different trap geometries and total number of condensate atoms) onto a single universal curve, for the inverse period of oscillations. Analogies with Josephson oscillations between two weakly coupled reservoirs of $^3$He-B and the internal Josephson effect in $^3$He-A are also discussed.

S. Raghavan; A. Smerzi; S. Fantoni; S. R. Shenoy

1997-06-23T23:59:59.000Z

444

Green and Orange CdTe Quantum Dots as Effective pH-Sensitive Fluorescent Probes for Dual Simultaneous and Independent Detection of Viruses  

Science Journals Connector (OSTI)

Green and Orange CdTe Quantum Dots as Effective pH-Sensitive Fluorescent Probes for Dual Simultaneous and Independent Detection of Viruses ... 26 The F0F1-ATP synthase is a nanoscale rotary biological motor. ... On the basis of this primary model, more than three different kinds of QDs could be mixed together to construct multicolor QD biosensors, which may be a feasible method to optical encoding detection of various viruses in the future. ...

Zhengtao Deng; Yun Zhang; Jiachang Yue; Fangqiong Tang; Qun Wei

2007-09-21T23:59:59.000Z

445

Nuclear quantum effects on the structure and the dynamics of [H{sub 2}O]{sub 8} at low temperatures  

SciTech Connect

We use ring-polymer-molecular-dynamics (RPMD) techniques and the semi-empirical q-TIP4P/F water model to investigate the relationship between hydrogen bond connectivity and the characteristics of nuclear position fluctuations, including explicit incorporation of quantum effects, for the energetically low lying isomers of the prototype cluster [H{sub 2}O]{sub 8} at T = 50 K and at 150 K. Our results reveal that tunneling and zero-point energy effects lead to sensible increments in the magnitudes of the fluctuations of intra and intermolecular distances. The degree of proton spatial delocalization is found to map logically with the hydrogen-bond connectivity pattern of the cluster. Dangling hydrogen bonds exhibit the largest extent of spatial delocalization and participate in shorter intramolecular O-H bonds. Combined effects from quantum and polarization fluctuations on the resulting individual dipole moments are also examined. From the dynamical side, we analyze the characteristics of the infrared absorption spectrum. The incorporation of nuclear quantum fluctuations promotes red shifts and sensible broadening relative to the classical profile, bringing the simulation results in much more satisfactory agreement with direct experimental information in the mid and high frequency range of the stretching band. While RPMD predictions overestimate the peak position of the low frequency shoulder, the overall agreement with that reported using an accurate, parameterized, many-body potential is reasonable, and far superior to that one obtains by implementing a partially adiabatic centroid molecular dynamics approach. Quantum effects on the collective dynamics, as reported by instantaneous normal modes, are also discussed.

Videla, Pablo E. [Departamento de Qumica Inorgnica Analtica y Qumica-Fsica e INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabelln II, 1428 Buenos Aires (Argentina)] [Departamento de Qumica Inorgnica Analtica y Qumica-Fsica e INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabelln II, 1428 Buenos Aires (Argentina); Rossky, Peter J. [Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712-0165 (United States)] [Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712-0165 (United States); Laria, D., E-mail: dhlaria@cnea.gov.ar [Departamento de Qumica Inorgnica Analtica y Qumica-Fsica e INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabelln II, 1428 Buenos Aires (Argentina); Departamento de Fsica de la Materia Condensada, Comisin Nacional de Energa Atmica, Avenida Libertador 8250, 1429 Buenos Aires (Argentina)

2013-11-07T23:59:59.000Z

446

Optical Stark Effect and Dressed Exciton States in a Mn-Doped CdTe Quantum Dot C. Le Gall,1  

E-Print Network (OSTI)

Optical Stark Effect and Dressed Exciton States in a Mn-Doped CdTe Quantum Dot C. Le Gall,1 A spin in a CdTe QD, like the strain- induced magnetic anisotropy or hyperfine coupling to the nuclei in this study is grown on a ZnTe substrate and contains CdTe QDs. A 6.5 monolayer thick CdTe layer is deposited

Boyer, Edmond

447

Magnetotransport near a quantum critical point in a simple metal  

Science Journals Connector (OSTI)

We use geometric considerations to study transport properties, such as the conductivity and Hall coefficient, near the onset of a nesting-driven spin-density wave in a simple metal. In particular, motivated by recent experiments on vanadium-doped chromium, we study the variation of transport coefficients with the onset of magnetism within a mean-field treatment of a model that contains nearly nested electron and hole Fermi surfaces. We show that most transport coefficients display a leading dependence that is linear in the energy gap. The coefficient of the linear term, though, can be small. In particular, we find that the Hall conductivity ?xy is essentially unchanged, due to electron-hole compensation, as the system goes through the quantum critical point. This conclusion extends a similar observation we made earlier for the case of completely flat Fermi surfaces to the immediate vicinity of the quantum critical point where nesting is present but not perfect.

Ya. B. Bazaliy; R. Ramazashvili; Q. Si; M. R. Norman

2004-04-21T23:59:59.000Z

448

Effective potential of a black hole in thermal equilibrium with quantum fields  

Science Journals Connector (OSTI)

Expectation values of one-loop renormalized thermal equilibrium stress-energy tensors of free conformal scalars, spin-1/2 fermions, and U(1) gauge fields on a Schwarzschild black hole background are used as sources in the semiclassical Einstein equation. The back reaction and new equilibrium metric have been found at O(?) for each spin field in previous work. In this paper, the nature of the modified black hole spacetime is explored through calculations of the effective potential for null and timelike orbits. Significant novel features affecting the motions of both massive and massless test particles show up at lowest order in ?=(MPl/M)2<1, where M is the black hole mass, and MPl is the Planck mass. Specifically, we find an increase in the black hole capture cross sections, and the existence of a region near the black hole with a repulsive contribution, generated by the U(1) back reaction, to the gravitational force. There is no such effect for other spins. Extrapolating our results suggests a tendency towards the formation of stable circular orbits, but the result cannot be established in O(?): the change in the metric becomes large and it changes its signature. We also consider the back reaction arising from multiple fields, which ultimately should be useful for treating a black hole in equilibrium with field ensembles belonging to gauge theories. In certain circumstances, however, reliable results will require calculations beyond O(?).

David Hochberg; Thomas W. Kephart; James W. York; Jr.

1994-05-15T23:59:59.000Z

449

401-C Allen Hall Department of Physics and Astronomy  

E-Print Network (OSTI)

401-C Allen Hall Department of Physics and Astronomy 3941 O'Hara Street Pittsburgh, PA 15260 for these problems. A few years ago, a physics and astronomy graduate student, Brian Cherinka, took a course you between a few members of our department of Physics and Astronomy (Michael Wood-Vasey, Arthur Kosowsky

Marai, G. Elisabeta "Liz"

450

The Rockefeller University Office of Technology Transfer 502 Founders Hall  

E-Print Network (OSTI)

The Rockefeller University Office of Technology Transfer 502 Founders Hall 1230 York Avenue New Information U.S. Patent 7,323,683 (issued January 28, 2008) Tari Suprapto, Ph.D. Assistant Director Technology Transfer (212) 327-7095 tsuprapto@rockefeller.edu #12;

451

The Rockefeller University Office of Technology Transfer 502 Founders Hall  

E-Print Network (OSTI)

The Rockefeller University Office of Technology Transfer 502 Founders Hall 1230 York Avenue New. References Sandu, et al. 2010. J. Cell. Biol, 190:1039-52. Tari Suprapto, Ph.D. Assistant Director Technology Transfer (212) 327-7095 tsuprapto@rockefeller.edu #12;

452

The Rockefeller University Office of Technology Transfer 502 Founders Hall  

E-Print Network (OSTI)

The Rockefeller University Office of Technology Transfer 502 Founders Hall 1230 York Avenue New://www.nature.com/tp/journal/v4/n1/abs/tp2013124a.html Tari Suprapto, Ph.D. Assistant Director Technology Transfer (212) 327

de Lange, Titia

453

The Rockefeller University Office of Technology Transfer 502 Founders Hall  

E-Print Network (OSTI)

The Rockefeller University Office of Technology Transfer 502 Founders Hall 1230 York Avenue New York, NY 10065 www.rockefeller.edu/techtransfer Tari Suprapto, Ph.D. Assistant Director Technology Transfer (212) 327-7095 tsuprapto@rockefeller.edu Alleles of Human Kappa Opioid Receptors and Uses Thereof

454

The Rockefeller University Office of Technology Transfer 502 Founders Hall  

E-Print Network (OSTI)

The Rockefeller University Office of Technology Transfer 502 Founders Hall 1230 York Avenue New Transfer (212) 327-7095 tsuprapto@rockefeller.edu #12;The Rockefeller University Office of Technology.S. patent application US 2013-0064762-A1 is pending. Tari Suprapto, Ph.D. Assistant Director Technology

455

The Rockefeller University Office of Technology Transfer 502 Founders Hall  

E-Print Network (OSTI)

The Rockefeller University Office of Technology Transfer 502 Founders Hall 1230 York Avenue New York, NY 10021-6399 www.rockefeller.edu/techtransfer Tari Suprapto, Ph.D. Assistant Director Technology Transfer (212) 327-7095 tsuprapto@rockefeller.edu A Novel Disc-Based Apparatus for High-Throughput Sample

456

The Rockefeller University Office of Technology Transfer 502 Founders Hall  

E-Print Network (OSTI)

The Rockefeller University Office of Technology Transfer 502 Founders Hall 1230 York Avenue New York, NY 10021-6399 www.rockefeller.edu/techtransfer Tari Suprapto, Ph.D. Assistant Director Technology Transfer (212) 327-7095 tsuprapto@rockefeller.edu A Novel Regulator Of Extracellular Virulence Genes

457

The Rockefeller University Office of Technology Transfer 502 Founders Hall  

E-Print Network (OSTI)

The Rockefeller University Office of Technology Transfer 502 Founders Hall 1230 York Avenue New York, NY 10021-6399 www.rockefeller.edu/techtransfer Tari Suprapto, Ph.D. Assistant Director Technology Transfer (212) 327-7095 tsuprapto@rockefeller.edu Novel Inhibitors of Thrombotic Clot Formation RU808+ RU

458

203 Day Hall Ithaca, NY 14853-2602  

E-Print Network (OSTI)

203 Day Hall Ithaca, NY 14853-2602 Page 1 of 2 WILLIAM D. FORD FEDERAL DIRECT LOAN APPLICATION Form F4 BEFORE YOU BEGIN The Direct Loan Program makes federal loan funds available to students directly is not an additional loan source; it replaced the Federal Stafford and SLS Loan programs at Cornell. APPLICATION

Keinan, Alon

459

Single particle detection: Phase control in submicron Hall sensors  

SciTech Connect

We present a phase-sensitive ac-dc Hall magnetometry method which allows a clear and reliable separation of real and parasitic magnetic signals of a very small magnitude. High-sensitivity semiconductor-based Hall crosses are generally accepted as a preferential solution for non-invasive detection of superparamagnetic nanobeads used in molecular biology, nanomedicine, and nanochemistry. However, detection of such small beads is often hindered by inductive pick-up and other spurious signals. The present work demonstrates an unambiguous experimental route for detection of small magnetic moments and provides a simple theoretical background for it. The reliability of the method has been tested for a variety of InSb Hall sensors in the range 600 nm-5 {mu}m. Complete characterization of empty devices, involving Hall coefficients and noise measurements, has been performed and detection of a single FePt bead with diameter of 140 nm and magnetic moment of {mu}{approx_equal}10{sup 8} {mu}{sub B} has been achieved with a 600 nm-wide sensor.

Di Michele, Lorenzo; Shelly, Connor; Gallop, John; Kazakova, Olga [National Physical Laboratory, Teddington TW11 0LW (United Kingdom)

2010-11-15T23:59:59.000Z

460

Ethics in the by Wilma F. Hall, MS  

E-Print Network (OSTI)

Ethics in the Workplace by Wilma F. Hall, MS Extension Associate Objectives: You'll learn.... · To understand the application of ethics to a business situation · How to communicate standards of ethical behavior · The six pillars for character education · Benefits of ethics in the workplace · And much more

Note: This page contains sample records for the topic "quantum hall effect" 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

Physics & Astronomy Open House Schedule UH Manoa Watanabe Hall  

E-Print Network (OSTI)

Physics & Astronomy Open House Schedule UH Manoa Watanabe Hall 22 November 2014 0830 - 1245 *** Physics & Astronomy info. available at www.phys.hawaii.edu *** Welcome & Overview: Prof. Pui Lam in Physical Science 217 at 0830 ** schedules for groups 1 to 10 below for 0900-1100 ** **solar observing

462

Sustainable Ecotourism Development Room 222 Newins-Ziegler Hall  

E-Print Network (OSTI)

FOR 4664: Sustainable Ecotourism Development Fall, 2011 Room 222 Newins-Ziegler Hall Tuesday Period Objectives: Students will learn how the emerging concept of ecotourism and outdoor recreation fits, and environmental benefits associated with recreation and ecotourism. The course will take a practical approach

Watson, Craig A.

463

Residence Hall Handbook Policies, Regulations, and Standards of Conduct  

E-Print Network (OSTI)

does not tolerate physical or psychological threats, harassment, intimidation, or violence directed1 Residence Hall Handbook Policies, Regulations, and Standards of Conduct Updated August 2013 member who works, lives, studies, teaches, does research, conducts business or is involved in the living

Stowell, Michael

464

FORUMA Hamilton Spectator Town Hall Event SPEAKERS INCLUDE  

E-Print Network (OSTI)

R001990104 OPEN FORUMA Hamilton Spectator Town Hall Event SPEAKERS INCLUDE: STEVE BUIST, Spectator, former chairman of Hamilton-Wentworth region and now president and CEO of the Hamilton Community Foundation. DR. CHRIS MACKIE, Hamilton's associate medical officer of health. MARK CHAMBERLAIN, president

Thompson, Michael

465

Dr Rocky K. C. Chang Warden of Lizhi Hall  

E-Print Network (OSTI)

Dr Rocky K. C. Chang Warden of Lizhi Hall Warden Office: Room 968 Intercom: 0968 Email: csrchang in women sports (swimming, field and track, badminton, volleyball, etc). I have confirmed with Ruby on energy saving came as a pleasant surprise. Our achievements are by no means limited to these external

Chang, Rocky Kow-Chuen

466

ENGINEERS' DAY 2011 ACTIVITIES 1800 Engineering Hall, 1415 Engineering Drive  

E-Print Network (OSTI)

, Operations Support Exelon Nuclear Warrenville, Illinois Brian J. Rauch Vice President, Engineering John DeereENGINEERS' DAY 2011 ACTIVITIES 1800 Engineering Hall, 1415 Engineering Drive 5:30 SOCIAL HOUR · Distinguished Achievement Awards · Early-Career Achievement Award · College of Engineering faculty and staff

Sheridan, Jennifer

467

ESM 201 Ecology of Managed Ecosystems (4.0 units) Fall 2011 Tues, Thurs 8:30 -9:45am; Bren Hall 1414  

E-Print Network (OSTI)

ESM 201 Ecology of Managed Ecosystems (4.0 units) Fall 2011 Tues, Thurs 8:30 - 9:45am; Bren Hall@bren.ucsb.edu) This course covers principles of individual, population, community, and ecosystem ecology, with an emphasis on applications (conservation, resource management, ecological effects of pollution and habitat fragmentation, etc

California at Santa Barbara, University of

468

I, Quantum Robot: Quantum Mind control on a Quantum Computer  

E-Print Network (OSTI)

The logic which describes quantum robots is not orthodox quantum logic, but a deductive calculus which reproduces the quantum tasks (computational processes, and actions) taking into account quantum superposition and quantum entanglement. A way toward the realization of intelligent quantum robots is to adopt a quantum metalanguage to control quantum robots. A physical implementation of a quantum metalanguage might be the use of coherent states in brain signals.

Paola Zizzi

2008-12-25T23:59:59.000Z

469

VEE-0067 - In the Matter of M.L. Halle Oil Service, Inc. | Department of  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

67 - In the Matter of M.L. Halle Oil Service, Inc. 67 - In the Matter of M.L. Halle Oil Service, Inc. VEE-0067 - In the Matter of M.L. Halle Oil Service, Inc. On August 9, 1999 M.L. Halle Oil Service, Inc. (Halle) of Manchester, New Hampshire, filed an Application for Exception with the Office of Hearings and Appeals (OHA) of the Department of Energy (DOE). In its application, Halle requests that it be temporarily relieved of the requirement to prepare and file the Energy Information Administration's (EIA) form entitled "Resellers'/ Retailers' Monthly Petroleum Product Sales Report" (Form EIA-782B). As explained below, we have concluded that Halle shall be excused from filing Form EIA-782B for four months. vee0067.pdf More Documents & Publications VEE-0080 - In the Matter of Potter Oil Co., Inc.

470

TBB-0042 - In the Matter of Curtis Hall | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

42 - In the Matter of Curtis Hall 42 - In the Matter of Curtis Hall TBB-0042 - In the Matter of Curtis Hall This letter concerns the complaint of retaliation filed by Curtis Hall (the complainant or Mr. Hall) with the Department of Energy under 10 C . F. R. Part 7 0 8 , the DOE Con tractor Employee (Whistleblower) Protection Program. On March 13, 2008, the Office of Hearings and Appeals (OHA) received your Petition for Secretarial Review of the appeal decision we issued on February 13, 2008. Under Part 708 regulations, the Secretary will reverse or revise an appeal decision by the Director of OHA only in extraordinary circumstances. 10 C.F.R. § 708.35(d). tbb0042.pdf More Documents & Publications TBA-0042 - In the Matter of Curtis Hall TBB-0030 - In the Matter of Curtis Broaddus TBH-0042 - In the Matter of Curtis Hall

471

Background Gas Pressure Effects in the Cylindrical Hall Yevgeny Raitses,*  

E-Print Network (OSTI)

are in the opposite direction (opposite polarity).2 * Research Physicist, PPPL, MS-17, P.O. Box 451, Princeton NJ, Princeton University and PPPL, MS-1730, P.O. Box 451, Princeton NJ 08543, AIAA Senior Member American

472

Anomalous Hall effect in a two-dimensional electron gas  

E-Print Network (OSTI)

transport theory or the diagrammatic approach based on the Kubo- Streda linear-response formalism. The equivalence of these two methods for the two-dimensional Dirac-band graphene system has recently been shown by Sinitsyn et al.,10 who explicitly...

Nunner, Tamara S.; Sinitsyn, N. A.; Borunda, Mario F.; Dugaev, V. K.; Kovalev, A. A.; Abanov, Artem; Timm, Carsten; Jungwirth, T.; Inoue, Jun-ichiro; MacDonald, A. H.; Sinova, Jairo.

2007-01-01T23:59:59.000Z

473

JLab Hall B Radiological Posting Change Effective Nov. 6 | Jefferson...  

NLE Websites -- All DOE Office Websites (Extended Search)

RadConpdfformsGenAccRWP.pdf If you have any questions about this notice or the RWP, call the RadCon cell phone at 876-1743. Submitted: Wednesday, November 5, 2014 - 3:25pm...

474

Hall-Effect in Amorphous La1-Xgax Foils  

E-Print Network (OSTI)

, but to date no calculations exist which predict this for liquid or amorphous La. The temperature dependence is also anomalous but so is that of cry- stalline La. More precise measurements of RII for this system are desirable. We are considering..., but to date no calculations exist which predict this for liquid or amorphous La. The temperature dependence is also anomalous but so is that of cry- stalline La. More precise measurements of RII for this system are desirable. We are considering...

COLTER, PC; Adair, Thomas W.; Naugle, Donald G.

1979-01-01T23:59:59.000Z

475

A multiplexed quantum memory  

Science Journals Connector (OSTI)

A quantum repeater is a system for long-distance quantum communication that employs quantum memory elements to mitigate optical fiber transmission losses. The multiplexed quantum...

Lan, S -Y; Radnaev, A G; Collins, O A; Matsukevich, D N; Kennedy, T A; Kuzmich, A

2009-01-01T23:59:59.000Z

476

A Parallel Quantum Computer Simulator  

E-Print Network (OSTI)

A Quantum Computer is a new type of computer which can efficiently solve complex problems such as prime factorization. A quantum computer threatens the security of public key encryption systems because these systems rely on the fact that prime factorization is computationally difficult. Errors limit the effectiveness of quantum computers. Because of the exponential nature of quantum com puters, simulating the effect of errors on them requires a vast amount of processing and memory resources. In this paper we describe a parallel simulator which accesses the feasibility of quantum computers. We also derive and validate an analytical model of execution time for the simulator, which shows that parallel quantum computer simulation is very scalable.

Kevin M. Obenland; Alvin M. Despain

1998-04-16T23:59:59.000Z

477

Quantum Channels with Memory  

E-Print Network (OSTI)

We present a general model for quantum channels with memory, and show that it is sufficiently general to encompass all causal automata: any quantum process in which outputs up to some time t do not depend on inputs at times t' > t can be decomposed into a concatenated memory channel. We then examine and present different physical setups in which channels with memory may be operated for the transfer of (private) classical and quantum information. These include setups in which either the receiver or a malicious third party have control of the initializing memory. We introduce classical and quantum channel capacities for these settings, and give several examples to show that they may or may not coincide. Entropic upper bounds on the various channel capacities are given. For forgetful quantum channels, in which the effect of the initializing memory dies out as time increases, coding theorems are presented to show that these bounds may be saturated. Forgetful quantum channels are shown to be open and dense in the set of quantum memory channels.

Dennis Kretschmann; Reinhard F. Werner

2005-02-17T23:59:59.000Z

478

Two-dimensional Vortex Behavior in Highly Underdoped YBa2Cu3O6 x Observed by Scanning Hall Probe Microscopy  

SciTech Connect

We report scanning Hall probe microscopy of highly underdoped superconducting YBa{sub 2}Cu{sub 3}O{sub 6+x} with T{sub c} ranging from 5 to 15 K which showed distinct flux bundles with less than one superconducting flux quantum ({Iota}{sub 0}) through the sample surface. The sub-{Iota}{sub 0} features occurred more frequently for lower T{sub c}, were more mobile than conventional vortices, and occurred more readily when the sample was cooled with an in-plane field component. We show that these features are consistent with kinked stacks of pancake vortices.

Guikema, J.W.

2010-02-22T23:59:59.000Z

479

Two-dimensional Vortex Behavior in Highly Underdoped YBa_2Cu_3O_{6+x} Observed byScanning Hall Probe Microscopy  

SciTech Connect

We report scanning Hall probe microscopy of highly underdoped superconducting YBa{sub 2}Cu{sub 3}O{sub 6+z} with T{sub c} ranging from 5 to 15 K which showed distinct flux bundles with less than one superconducting flux quantum ({Phi}{sub 0}) through the sample surface. The sub-{Phi}{sub 0} features occurred more frequently for lower T{sub c}, were more mobile than conventional vortices, and occurred more readily when the sample was cooled with an in-plane field component. We show that these features are consistent with kinked stacks of pancake vortices.

Guikema, J.W.; Bluhm, Hendrik; /Stanford U., Appl. Phys. Dept.; Bonn, D.A.; Liang, Ruixing; Hardy, W.N.; /British Columbia U.; Moler, K.A.; /Stanford U., Appl. Phys. Dept.

2008-04-22T23:59:59.000Z

480

Electronic topological transition in an n-BiSb semiconductor alloy in the quantum limit range of magnetic fields for H-parallel C{sub 2}  

SciTech Connect

The galvanomagnetic properties of single-crystal samples of the Bi{sub 0.93}Sb{sub 0.07} semiconductor alloy with the electron density n = 1.6 x 10{sup 17} cm{sup -3} in magnetic fields up to 14 T at T = 1.6 K have been investigated. The resistivity {rho} and Hall coefficient R have been measured as functions of the magnetic field directed along the binary axis of a crystal for a current flowing through a sample along the bisector axis; i.e., the components {rho}{sub 22} and R{sub 32,1} have been measured. The strong anisotropy of the electron spectrum of the samples makes it possible to separately observe quantum oscillations of the magnetoresistance {rho}{sub 22}(H) for H -parallel C{sub 2} in low magnetic fields for two equivalent ellipsoids with small extremal cross sections (secondary ellipsoids) and in high magnetic fields for electrons of the ellipsoid with a large extremal cross section (main ellipsoid). An increase in the energy of the electrons of secondary ellipsoids in the quantum limit magnetic fields is accompanied by the flow of electrons to the main ellipsoid; i.e., an electronic topological transition occurs from the three-valley electron spectrum to the single-valley one. After the flow stops, the Fermi energy E{sub F} increases from 18 meV to 27.8 meV. With an increase in the quantizing magnetic field, the Fermi energy of the electrons decreases both in the region of quantum oscillations of the resistance that are attributed to the electrons of the secondary ellipsoids and in the region of oscillations associated with the electrons of the main ellipsoid. The Hall coefficient R{sub 32,1} decreases in high magnetic fields; this behavior indicates the absence of the electron magnetic freezing effect.

Red'ko, N. A., E-mail: nikolaj.a.redko@mail.ioffe.ru; Kagan, V. D.; Volkov, M. P. [Russian Academy of Sciences, Ioffe Physicotechnical Institute (Russian Federation)

2010-08-15T23:59:59.000Z

Note: This page contains sample records for the topic "quantum hall effect" 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

Cascading and local-field effects in non-linear optics revisited: A quantum-field picture based on exchange of photons  

SciTech Connect

The semi-classical theory of radiation-matter coupling misses local-field effects that may alter the pulse time-ordering and cascading that leads to the generation of new signals. These are then introduced macroscopically by solving Maxwell's equations. This procedure is convenient and intuitive but ad hoc. We show that both effects emerge naturally by including coupling to quantum modes of the radiation field that are initially in the vacuum state to second order. This approach is systematic and suggests a more general class of corrections that only arise in a QED framework. In the semi-classical theory, which only includes classical field modes, the susceptibility of a collection of N non-interacting molecules is additive and scales as N. Second-order coupling to a vacuum mode generates an effective retarded interaction that leads to cascading and local field effects both of which scale as N{sup 2}.

Bennett, Kochise, E-mail: kcbennet@uci.edu; Mukamel, Shaul, E-mail: smukamel@uci.edu [Chemistry Department, University of California, Irvine, California 92697-2025 (United States)] [Chemistry Department, University of California, Irvine, California 92697-2025 (United States)

2014-01-28T23:59:59.000Z

482

Pressure Effects on Magneto-Optical Properties in Cadmium Telluride/(Cadmium, Manganese) Telluride Single Quantum Well with High Manganese Concentration  

SciTech Connect

The pressure effect on the magnetic field induced type I-type II transition is studied in a CdTe/Cd1-xMnxTe (x=0.24) single quantum well (SQW). Photoluminescence (PL) measurements under hydrostatic pressures up to 1.07 GPa and long pulsed magnetic fields up to 60 T with a pulse duration of 2 sec are reported. The pressures were generated in a plastic diamond anvil cell (DAC). A bend toward lower energies (additional red shift) is observed above 28.5 T in magnetic field dependence of the exciton energy for a 13 Aring thick quantum well. We attribute this red shift to a phenomenon preceding the type I-type II transition after a comparison with a simple quantum mechanical calculation. The onset field of the additional red shift increases by 3.4 T by applying a pressure of 1.07 GPa. Spin-spin coupling between the exciton and the Mn ion in the interface region is also investigated and found to be enhanced by pressure.

Yokoi, H.; Tozer,S.; Kim, Y.; Rickel, D.; Kakudate, Y.; Usuba, S.; Fujiwara, S.; Takeyama, S.; Karczewski, G.; Wojtowicz, T.; Kossut, J.

1998-11-09T23:59:59.000Z

483

Effect of crystal-field split-off hole and heavy-hole bands crossover on gain characteristics of high Al-content AlGaN quantum well lasers  

E-Print Network (OSTI)

of high Al-content AlGaN quantum well lasers Jing Zhang, Hongping Zhao, and Nelson Tansu Citation: Appl of crystal-field split-off hole and heavy-hole bands crossover on gain characteristics of high Al-content Al characteristics of high Al-content AlGaN quantum wells QWs are analyzed for deep UV lasers. The effect of crystal

Gilchrist, James F.

484

Recent Results of TMD Measurements from Jefferson Lab Hall A  

SciTech Connect

This slide-show presents results on transverse momentum distributions. The presentation covers: target single-spin asymmetry (SSA) (in parity conserving interactions); Results of JLab Hall A polarized {sup 3}He target TMD measurement; Semi-?inclusive deep-inelastic scattering channels (E06-010); Target single-spin asymmetry A{sub UT}, Collins and Sivers SSA on neutron; Double-spin asymmetry A{sub LT}, extract TMD g{sub 1T} on neutron; Inclusive channels SSA (E06-010, E05-015, E07-013) Target SSA: inclusive {sup 3}He(e,e) quasi-elastic scattering; Target SSA: inclusive {sup 3}He(e,e) deep inelastic-elastic scattering; New SIDIS experiments planned in Hall-A for JLab-12 GeV.

Jiang, Xiaodong [LANL

2013-10-01T23:59:59.000Z

485

Centre Hall, Pennsylvania: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

Hall, Pennsylvania: Energy Resources Hall, Pennsylvania: Energy Resources Jump to: navigation, search Equivalent URI DBpedia Coordinates 40.8475635°, -77.6861093° 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":40.8475635,"lon":-77.6861093,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

486

The Invisible Quantum Barrier  

E-Print Network (OSTI)

We construct the invisible quantum barrier which represents the phenomenon of quantum reflection using the available data. We use the Abel equation to invert the data. The resulting invisible quantum barrier is double-valued in both axes. We study this invisible barrier in the case of atom and Bose-Einstein Condensate reflection from a solid silicon surface. A time-dependent, one-spatial dimension Gross-Pitaevskii equation is solved for the BEC case. We found that the BEC behaves very similarly to the single atom except for size effects, which manifest themselves in a maximum in the reflectivity at small distances from the wall. The effect of the atom-atom interaction on the BEC reflection and correspondingly on the invisible barrier is found to be appreciable at low velocities and comparable to the finite size effect. The trapping of ultracold atoms or BEC between two walls is discussed.

J. X. de Carvalho; M. S. Hussein; Weibin Li

2008-02-06T23:59:59.000Z

487

Building America Top Innovations Hall of Fame Profile … Low-Cost Ventilation in Production Housing  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

simple, cost-effective techniques for providing fresh air throughout the home, including exhaust-only and central fan-integrated supply ventilation. Building America has refined simple whole-house ventilation systems that cost less than $350 to install. BUILDING AMERICA TOP INNOVATIONS HALL OF FAME PROFILE INNOVATIONS CATEGORY: 1. Advanced Technologies and Practices 1.3 Assured Health, Safety, and Durability Low-Cost Ventilation in Production Housing As high-performance homes get more air-tight and better insulated, attention to good indoor air quality becomes essential. Building America has effectively guided the nation's home builders to embrace whole-house ventilation by developing low-cost options that adapt well to their production processes. When the U.S. Department of Energy's Building America research teams began

488

Gradient instabilities of electromagnetic waves in Hall thruster plasma  

SciTech Connect

This paper presents a linear analysis of gradient plasma instabilities in Hall thrusters. The study obtains and analyzes the dispersion equation of high-frequency electromagnetic waves based on the two-fluid model of a cold plasma. The regions of parameters corresponding to unstable high frequency modes are determined and the dependence of the increments and intrinsic frequencies on plasma parameters is obtained. The obtained results agree with those of previously published studies.

Tomilin, Dmitry [Department of Electrophysics, Keldysh Research Centre, Moscow 125438 (Russian Federation)

2013-04-15T23:59:59.000Z

489

Transition in Electron Transport in a Cylindrical Hall Thruster  

SciTech Connect

Through the use of high-speed camera and Langmuir probe measurements in a cylindrical Hall thruster, we report the discovery of a rotating spoke of increased plasma density and light emission which correlates with increased electron transport across the magnetic field. As cathode electron emission is increased, a sharp transition occurs where the spoke disappears and electron transport decreases. This suggests that a significant fraction of the electron current might be directed through the spoke.

J.B. Parker, Y. Raitses, and N.J. Fisch

2010-06-02T23:59:59.000Z

490

Investigations of Probe Induced Perturbations in a Hall Thruster  

SciTech Connect

An electrostatic probe used to measure spatial plasma parameters in a Hall thruster generates perturbations of the plasma. These perturbations are examined by varying the probe material, penetration distance, residence time, and the nominal thruster conditions. The study leads us to recommendations for probe design and thruster operating conditions to reduce discharge perturbations, including metal shielding of the probe insulator and operation of the thruster at lower densities.

D. Staack; Y. Raitses; N.J. Fisch

2002-08-12T23:59:59.000Z

491

Manifestations of topological effects in graphene  

E-Print Network (OSTI)

Graphene is a monoatomic layer of graphite with Carbon atoms arranged in a two dimensional honeycomb lattice configuration. It has been known for more than sixty years that the electronic structure of graphene can be modelled by two-dimensional massless relativistic fermions. This property gives rise to numerous applications, both in applied sciences and in theoretical physics. Electronic circuits made out of graphene could take advantage of its high electron mobility that is witnessed even at room temperature. In the theoretical domain the Dirac-like behavior of graphene can simulate high energy effects, such as the relativistic Klein paradox. Even more surprisingly, topological effects can be encoded in graphene such as the generation of vortices, charge fractionalization and the emergence of anyons. The impact of the topological effects on graphene's electronic properties can be elegantly described by the Atiyah-Singer index theorem. Here we present a pedagogical encounter of this theorem and review its various applications to graphene. A direct consequence of the index theorem is charge fractionalization that is usually known from the fractional quantum Hall effect. The charge fractionalization gives rise to the exciting possibility of realizing graphene based anyons that unlike bosons or fermions exhibit fractional statistics. Besides being of theoretical interest, anyons are a strong candidate for performing error free quantum information processing.

Jiannis K. Pachos

2008-12-05T23:59:59.000Z

492

Quantum discord between relatively accelerated observers  

E-Print Network (OSTI)

We calculate the quantum discord between two free modes of a scalar field which start in a maximally entangled state and then undergo a relative, constant acceleration. In a regime where there is no distillable entanglement due to the Unruh effect, we show that there is a finite amount of quantum discord, which is a measure of purely quantum correlations in a state, over and above quantum entanglement. Even in the limit of infinite acceleration of the observer detecting one of the modes, we provide evidence for a non-zero amount of purely quantum correlations, which might be exploited to gain non-trivial quantum advantages.

Animesh Datta

2009-05-20T23:59:59.000Z

493

Sub-Doppler Spectra of Infrared Hyperfine Transitions of Nitric Oxide Using a Pulse Modulated Quantum Cascade Laser: Rapid Passage, Free Induction Decay and the AC Stark Effect  

SciTech Connect

Using a low power, rapid (nsec) pulse-modulated quantum cascade (QC) laser, collective coherent effects in the 5 {micro}m spectrum of nitric oxide have been demonstrated by the observation of sub-Doppler hyperfine splitting and also Autler-Townes splitting of Doppler broadened lines. For nitrous oxide, experiments and model calculations have demonstrated that two main effects occur with ulsemodulated (chirped) quantum cascade lasers: free induction decay signals, and signals induced by rapid passage during the laser chirp. In the open shell molecule, NO, in which both {Lambda}-doubling splitting and hyperfine structure occur, laser field-induced coupling between the hyperfine levels of the two {Lambda}-doublet components can induce a large AC Stark effect. This may be observed as sub-Doppler structure, field-induced splittings, or Autler-Townes splitting of a Doppler broadened line. These represent an extension of the types of behaviour observed in the closed shell molecule nitrous oxide, using the same apparatus, when probed with an 8 {micro}m QC laser.

Duxbury, Geoffrey; Kelly, James F.; Blake, Thomas A.; Langford, Nigel

2012-05-07T23:59:59.000Z

494

Polarization preserving quantum nondemolition photodetector  

E-Print Network (OSTI)

A polarization preserving quantum nondemolition photodetector is proposed based on nonlinearities obtainable through quantum coherence effects. An atomic level scheme is devised such that in the presence of strong linearly polarized drive field a coherent weak probe field acquires a phase proportional to the number of photons in the signal mode immaterial of its polarization state. It is also shown that the unavoidable phase-kicks resulting due to the measurement process are insensitive to the polarization state of the incoming signal photon. It is envisioned that such a device would have tremendous applicability in photonic quantum information proposals where quantum information in the polarization qubit is to be protected.

K. T. Kapale

2006-03-30T23:59:59.000Z

495

Magnetic-field-tuned quantum criticality of the heavy-fermion system YbPtBi  

SciTech Connect

In this paper, we present systematic measurements of the temperature and magnetic field dependencies of the thermodynamic and transport properties of the Yb-based heavy fermion YbPtBi for temperatures down to 0.02 K with magnetic fields up to 140 kOe to address the possible existence of a field-tuned quantum critical point. Measurements of magnetic-field- and temperature-dependent resistivity, specific heat, thermal expansion, Hall effect, and thermoelectric power indicate that the AFM order can be suppressed by an applied magnetic field of Hc?4 kOe. In the H-T phase diagram of YbPtBi, three regimes of its low-temperature states emerge: (I) AFM state, characterized by a spin density wave-like feature, which can be suppressed to T=0 by the relatively small magnetic field of Hc?4 kOe; (II) field-induced anomalous state in which the electrical resistivity follows ??(T)?T1.5 between Hc and ?8 kOe; and (III) Fermi liquid (FL) state in which ??(T)?T2 for H?8 kOe. Regions I and II are separated at T=0 by what appears to be a quantum critical point. Whereas region III appears to be a FL associated with the hybridized 4f states of Yb, region II may be a manifestation of a spin liquid state.

Mun, E. D. [Ames Laboratory; Budko, Serguei L. [Ames Laboratory; Martin, Catalin [Ames Laboratory; Kim, Hyong June [Ames Laboratory; Tanatar, Makariy A. [Ames Laboratory; Park, J.-H. [Florida State University; Murphy, T. [Florida State University; Schmiedeshoff, G. M. [Occidental College; Dilley, N. [Quantum Design; Prozorov, Ruslan [Ames Laboratory; Canfield, Paul C. [Ames Laboratory

2013-02-15T23:59:59.000Z

496

Parrondo Games and Quantum Algorithms  

E-Print Network (OSTI)

We pursue the possible connections between classical games and quantum computation. The Parrondo game is one in which a random combination of two losing games produces a winning game. We introduce novel realizations of this Parrondo effect in which the player can `win' via random reflections and rotations of the state-vector, and connect these to known quantum algorithms.

Chiu Fan Lee; Neil Johnson

2002-03-10T23:59:59.000Z

497

Electric Time in Quantum Cosmology  

E-Print Network (OSTI)

Effective quantum cosmology is formulated with a realistic global internal time given by the electric vector potential. New possibilities for the quantum behavior of space-time are found, and the high-density regime is shown to be very sensitive to the specific form of state realized.

Stephon Alexander; Martin Bojowald; Antonino Marciano; David Simpson

2012-12-10T23:59:59.000Z

498

Diversity Town Hall Draws a Crowd at the Energy Department | Department of  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Diversity Town Hall Draws a Crowd at the Energy Department Diversity Town Hall Draws a Crowd at the Energy Department Diversity Town Hall Draws a Crowd at the Energy Department December 12, 2011 - 1:43pm Addthis Secretary Chu speaks at the Workforce Diversity and Inclusion Town Hall on December 6, 2011. | Energy Department file photo. Secretary Chu speaks at the Workforce Diversity and Inclusion Town Hall on December 6, 2011. | Energy Department file photo. Karissa Marcum Public Affairs Specialist, Office of Public Affairs "For our own good, we want as wide of a talent pool as we can get." Secretary Steven Chu The Energy Department held a Workforce Diversity and Inclusion Town Hall event on December 6th, delivering on Secretary Steven Chu's commitment to promoting a culture that strongly values diversity and inclusion.

499

After 105 Years, Historic City Hall in West Des Moines, Iowa Goes Green |  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

After 105 Years, Historic City Hall in West Des Moines, Iowa Goes After 105 Years, Historic City Hall in West Des Moines, Iowa Goes Green After 105 Years, Historic City Hall in West Des Moines, Iowa Goes Green May 9, 2011 - 5:22pm Addthis The restored Historic City Hall building in West Des Moines' Valley Junction neighborhood. | Photo credit: Vicky Saylor The restored Historic City Hall building in West Des Moines' Valley Junction neighborhood. | Photo credit: Vicky Saylor April Saylor April Saylor Former Digital Outreach Strategist, Office of Public Affairs The city of West Des Moines, Iowa is using funding from the Recovery Act to renovate the Historic City Hall building located in Valley Junction, a charming neighborhood that boasts a weekly farmer's market, a block party during the summer months and unique shopping throughout the year.

500

TBB-0042 - In the Matter of Curtis Hall | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

TBB-0042 - In the Matter of Curtis Hall TBB-0042 - In the Matter of Curtis Hall TBB-0042 - In the Matter of Curtis Hall This letter concerns the complaint of retaliation filed by Curtis Hall (the complainant or Mr. Hall) with the Department of Energy under 10 C . F. R. Part 7 0 8 , the DOE Con tractor Employee (Whistleblower) Protection Program. On March 13, 2008, the Office of Hearings and Appeals (OHA) received your Petition for Secretarial Review of the appeal decision we issued on February 13, 2008. Under Part 708 regulations, the Secretary will reverse or revise an appeal decision by the Director of OHA only in extraordinary circumstances. 10 C.F.R. § 708.35(d). tbb0042.pdf More Documents & Publications TBA-0042 - In the Matter of Curtis Hall TBB-0030 - In the Matter of Curtis Broaddus