Proximity effect and multiple Andreev reflections in chaotic Josephson junctions

P. Samuelsson; G. Johansson; Å. Ingerman; V. S. Shumeiko; G. Wendin

doi:10.1103/PhysRevB.65.180514

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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

DOI 10.1103/PhysRevB.65.180514 · Physical Review B

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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 in the dot. It is found that for a Thouless energy ETh of the dot smaller than the superconducting energy gap Δ, the proximity effect is manifested as peaks in the differential conductance at voltages of order ETh away from the even subharmonic gap structures eV≈2(Δ±ETh)/2n. These peaks are insensitive to temperatures kT≪Δ but are suppressed by a weak magnetic field. This provides a qualitative explanation for recent experimental observations by Kutchinsky et al. [Phys. Rev. B 56, R2932 (1997)].