Mesoscopic conductance fluctuations in InAs nanowire-based SNS junctions

Abstract

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.

Manuscript and supplement

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• Supercurrent and multiple Andreev reflections in an InSb nanowire Josephson junction
• Multi-mode Fabry-Pérot conductance oscillations in suspended stacking-faults-free InAs nanowires
• Quasiparticle poisoning of Majorana qubits
• Anharmonicity of a Gatemon Qubit with a Few-Mode Josephson Junction
• Ultra-efficient superconducting Dayem bridge field-effect transistor
• Charge transport in InAs nanowire Josephson junctions
• Josephson Field-Effect Transistors Based on All-Metallic Al/Cu/Al Proximity Nanojunctions
• Nb/InAs nanowire proximity junctions from Josephson to quantum dot regimes
• Quantum phase diagram of Shiba impurities from bosonization
• Screening cloud and non-Fermi-liquid scattering in topological Kondo devices
• Probing proximity induced superconductivity in InAs nanowire using built-in barriers
• Current-voltage characteristics of asymmetric double-barrier Josephson junctions