Experimental signature of phase-coherent Andreev reflection | Zendy

K.-M. H. Lenssen | Zendy; Maarten Leys | Zendy; J.H. Wolter | Zendy

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Experimental signature of phase-coherent Andreev reflection

Author(s) -

K.-M. H. Lenssen,

Maarten Leys,

J.H. Wolter

Publication year - 1998

Publication title -

physical review. b, condensed matter

Language(s) - English

Resource type - Journals

eISSN - 1095-3795

pISSN - 0163-1829

DOI - 10.1103/physrevb.58.4888

Subject(s) - andreev reflection , condensed matter physics , physics , signature (topology) , superconductivity , conductance , reflection (computer programming) , phase (matter) , heterojunction , biasing , voltage , quantum mechanics , geometry , mathematics , computer science , programming language

We report experimental observation of a signature of phase-coherent Andreev reflection. In highly transmissive, superconducting contacts to the high mobility two-dimensional electron gas in GaAs/AlxGa12xAs heterostructures, a sharp conductance dip is found around zero bias voltage, which is ascribed to an enhancement of weak localization by Andreev reflection. This phenomenon is suppressed not only by increased temperature, a small magnetic field, or a large bias current, but also by applying a large negative voltage to a nearby gate. This behavior is in agreement with recent theoretical predictions. @S0163-1829~98!05731-2#

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