Multiple Andreev reflections in diffusive SINIS and SIFIS junctions

Author:

Polkin Artem V.12,Ioselevich Pavel A.314

Affiliation:

1. Landau Institute for Theoretical Physics

2. National Research University Higher School of Economics

3. Weizmann Institute of Science

4. Russian Quantum Center

Abstract

We study Multiple Andreev Reflections in long diffusive superconductor(S)-normal metal(N)-superconductor junctions with low-transparency interfaces. Assuming strong thermalization in the weak link, we calculate the current-voltage dependence I(V)I(V). At intermediate temperatures, \varepsilon_\mathrm{Th}\ll T\ll\DeltaεThTΔ, the current is dominated by noncoherent multiple Andreev reflections and is obtained analytically. The results are generalized to a ferromagnetic junction. We find that the exchange field produces a non-trivial splitting of the subharmonic gap structure. This effect relies on thermalization and vanishes in SFS junctions with no energy relaxation in the weak link.

Funder

National Research University Higher School of Economics

Russian Science Foundation

State Atomic Energy Corporation ROSATOM

Publisher

Stichting SciPost

Subject

General Physics and Astronomy

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