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Deutsche Physikalische Gessellschaft IOP Institute of Physics

Mesoscopic conductance fluctuations in InAs nanowire-based SNS junctions

T S Jespersen1, M L Polianski1,2, C B Sørensen1, K Flensberg1 and J Nygård1

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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 nonlinear in bias voltage and reveal subgap structure. The experimental findings are qualitatively explained in terms of multiple Andreev reflections in chaotic quantum dots with imperfect contacts.


PACS

74.40.+k Fluctuations (noise, chaos, nonequilibrium superconductivity, localization, etc.)

74.78.Na Mesoscopic and nanoscale systems

73.63.Kv Quantum dots

74.25.Fy Transport properties (electric and thermal conductivity, thermoelectric effects, etc.)

74.45.+c Proximity effects; Andreev effect; SN and SNS junctions

Subjects

Superconductivity

Nanoscale science and low-D systems

Dates

Issue 11 (November 2009)

Received 7 August 2009

Published 13 November 2009



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