FCS of superconducting tunnel junctions in non-equilibrium

TL;DR

This paper analyzes the full counting statistics of superconducting tunnel junctions in non-equilibrium, considering supercurrent and Andreev reflections, and compares theoretical predictions with experimental data.

Contribution

It generalizes previous results for supercurrent and Andreev reflections in superconducting junctions, including different gaps and intermediate regimes.

Findings

Unified treatment of supercurrent and Andreev reflections

Extension to junctions with different superconducting gaps

Comparison with experimental data

Abstract

We analyse the full counting statistics (FCS) of a superconducting junction in non-equilibrium in the limit of small interface transparency. In this limit we treat both supercurrent and multiple Andreev reflections on equal footing and show how to generalise previous results for both phenomena. Furthermore, we also allow for different gaps of both superconductors and investigate the intermediate regime which allows to make contact with previous results on normal-superconductor heterostructures. We also compare our predictions in this regime to experimental data.