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Proximity Effect and Multiple Andreev Reflections in Chaotic Josephson junctions

P. Samuelsson·G. Johansson·Å. Ingerman·V. S. Shumeiko·G. Wendin
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Abstract

We study the dc-current transport in a voltage biased superconductor-chaotic dot-superconductor junction with an induced proximity effect(PE) in the dot. It is found that for a Thouless energy $E_{Th}$ of the dot smaller than the superconducting energy gap $Δ$, the PE is manifested as peaks in the differential conductance at voltages of order $E_{Th}$ away from the even subharmonic gap structures $eV \approx 2(Δ\pm E_{Th})/2n$. These peaks are insensitive to temperatures $kT \ll Δ$ but are suppressed by a weak magnetic field. The current for suppressed PE is independent of $E_{Th}$ and magnetic field and is shown to be given by the Octavio-Tinkham-Blonder-Klapwijk theory.

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P. Samuelsson, G. Johansson, Å. Ingerman, V. S. Shumeiko, G. Wendin. 2001-05-31. Proximity Effect and Multiple Andreev Reflections in Chaotic Josephson junctions. https://doi.org/10.1103/physrevb.65.180514

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