Multiple Andreev reflections in hybrid multiterminal junctions

TL;DR

This paper theoretically explores charge transport in hybrid multiterminal superconducting junctions, revealing complex subharmonic gap structures caused by multiple Andreev reflections across different voltage-biased leads.

Contribution

It introduces a theoretical analysis of multiple Andreev reflections in multiterminal junctions, highlighting their impact on current-voltage characteristics in the incoherent regime.

Findings

Rich subharmonic gap structures observed

Multiple Andreev reflections involve several superconducting leads

Numerical evidence supports the theoretical predictions

Abstract

We investigate theoretically charge transport in hybrid multiterminal junctions with superconducting leads kept at different voltages. It is found that multiple Andreev reflections involving several superconducting leads give rise to rich subharmonic gap structures in the current-voltage characteristics. The structures are evidenced numerically in junctions in the incoherent regime.