Proximity Effect and Multiple Andreev Reflections in Chaotic Josephson junctions

Details Proximity Effect and Multiple Andreev Reflections in Chaotic Josephson junctions Proximity Effect and Multiple Andreev Reflections in Chaotic Josephson junctions

2001-05-31

arxiv.org/abs/cond-mat/0105605v1

Phys. Rev. B. 65 180514 (2002)

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures

Scientific paper

10.1103/PhysRevB.65.180514

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 $\Delta$, the PE is manifested as peaks in the differential conductance at voltages of order $E_{Th}$ away from the even subharmonic gap structures $eV \approx 2(\Delta\pm E_{Th})/2n$. These peaks are insensitive to temperatures $kT \ll \Delta$ 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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