Mesoscopic conductance fluctuations in InAs nanowire-based SNS junctions

Details Mesoscopic conductance fluctuations in InAs nanowire-based SNS junctions Mesoscopic conductance fluctuations in InAs nanowire-based SNS junctions

2009-01-27

arxiv.org/abs/0901.4242v2

New J. Phys. 11, 113025 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Manuscript and supplement

Scientific paper

10.1088/1367-2630/11/11/113025

We report a systematic experimental study of mesoscopic conductance fluctuations in superconductor/normal/superconductor (SNS) devices Nb/InAs-nanowire/Nb. These fluctuations far exceed their value in the normal state and strongly depend on temperature even in the low-temperature regime. This dependence is attributed to high sensitivity of perfectly conducting channels to dephasing and the SNS fluctuations thus provide a sensitive probe of dephasing in a regime where normal transport fails to detect it. Further, the conductance fluctuations are strongly non-linear in bias voltage and reveal sub-gap structure. The experimental findings are qualitatively explained in terms of multiple Andreev reflections in chaotic quantum dots with imperfect contacts.

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