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

Vladimir Z. Kresin

doi:10.1103/PhysRevB.34.7587

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

Vladimir Z. Kresin

DOI 10.1103/PhysRevB.34.7587 · Physical Review B

T1

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Abstract

The system Sα-Mβ-Sγ (Sα and Sγ are superconductors, Mβ is a semiconductor, a semimetal, or a normal metal) is studied. Particular attention is paid to the case when Mβ 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 jm 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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	9.2	Pressure not reported	unknown