Josephson current in low-dimensional proximity systems and the field effect

Journal Article · Mon Dec 01 04:00:00 EST 1986 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.34.7587· OSTI ID:6937276

Kresin, V Z

The system S/sub ..cap alpha../-M/sub ..beta../-S/sub ..gamma../ (S/sub ..cap alpha../ and S/sub ..gamma../ are superconductors, M/sub ..beta../ is a semiconductor, a semimetal, or a normal metal) is studied. Particular attention is paid to the case when M/sub ..beta../ contains a two-dimensional electron gas (e.g., an inversion layer). A one-dimensional (1D) case is also considered. The Josephson current is evaluated and the main factors determining the field effect are studied. A special diagrammatic method allowing one to calculate the thermodynamic Green's function and, consequently, the Josephson current, has been developed. The current depends strongly on the electron concentration which leads to a noticeable field effect. The dependence of j/sub m/ on other factors, such as temperature, mobility, effect mass, etc. is also studied. The field effect appears to be stronger for low-dimensional systems. An analysis of the experimental data obtained recently for the Nb-InAs-Nb system is carried out.

• Research Organization: Materials and Molecular Research Division, Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6937276
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 34:11; ISSN PRBMD
• Country of Publication: United States
• Language: English

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71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ARSENIC COMPOUNDS
ARSENIDES
DIAGRAMS
ELECTRIC FIELDS
ELECTRON GAS
ELEMENTS
FLUIDS
FUNCTIONS
GASES
GREEN FUNCTION
INDIUM ARSENIDES
INDIUM COMPOUNDS
JOSEPHSON EFFECT
JUNCTIONS
MATERIALS
METALS
NIOBIUM
ONE-DIMENSIONAL CALCULATIONS
PNICTIDES
PROXIMITY EFFECT
SEMICONDUCTOR MATERIALS
SEMIMETALS
SUPERCONDUCTING JUNCTIONS
SUPERCONDUCTORS
TRANSITION ELEMENTS
TWO-DIMENSIONAL CALCULATIONS