Coherent diffusive transport mediated by Andreev reflections at in a mesoscopic superconductor/semiconductor/superconductor junction

Abstract

We present experiments revealing a singularity in the coherent current across a superconductor/semiconductor/superconductor (SSmS) junction at the bias voltage corresponding to the superconducting energy gap (Formula presented) The SSmS structure consists of highly doped GaAs with superconducting electrodes of aluminum configured as an interferometer. The phase-coherent component of the current is probed as the amplitude of (Formula presented) vs magnetic-field oscillations in the differential resistance of the interferometer. © 1997 The American Physical Society.