Anomalous Andreev conductance in InAs-AlSb quantum well structures with Nb electrodes
- 9 November 1992
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 69 (19) , 2847-2850
- https://doi.org/10.1103/physrevlett.69.2847
Abstract
The differential conductance of InAs-AlSb quantum wells with superconducting Nb electrodes exhibits a sharp single peak at zero bias, followed by a drop below the normal conductance at voltages an order of magnitude higher than the gap voltage, before returning to the normal value at yet higher bias. The behavior is interpreted in terms of Andreev reflections, modified by multiple normal reflections of both electrons and Andreev holes between the Nb electrodes and the bottom barrier of the quantum well, in the presence of a nonuniform potential along the well.Keywords
This publication has 9 references indexed in Scilit:
- Excess conductance of superconductor-semiconductor interfaces due to phase conjugation between electrons and holesPhysical Review Letters, 1992
- Observation of pair currents in superconductor-semiconductor contactsPhysical Review Letters, 1991
- Crossover from tunneling to metallic behavior in superconductor-semiconductor contactsApplied Physics Letters, 1990
- InAs-AlSb quantum well as superconducting weak link with high critical current densityApplied Physics Letters, 1990
- Subharmonic energy-gap structure in superconducting weak linksPhysical Review B, 1988
- New method to study the proximity effect at the normal-metal–superconductor interfacePhysical Review Letters, 1987
- Superconducting tunneling without the tunneling Hamiltonian. II. Subgap harmonic structureJournal of Low Temperature Physics, 1987
- Metallic to tunneling transition in Cu-Nb point contactsPhysical Review B, 1983
- Transition from metallic to tunneling regimes in superconducting microconstrictions: Excess current, charge imbalance, and supercurrent conversionPhysical Review B, 1982