Enhancements of Andreev conductance induced by the photon/vibron scattering

TL;DR

This paper investigates how photon and vibron scattering influence Andreev conductance in a quantum dot system, revealing interference effects and signatures in differential conductance.

Contribution

It introduces a detailed analysis of bosonic mode effects on subgap Andreev states and conductance in quantum dot systems, highlighting new interference phenomena.

Findings

Bosonic emission/absorption creates multiple subgap Andreev states.

Interference among these states affects differential conductance.

Signatures are observable in both linear and nonlinear regimes.

Abstract

We analyze the subgap spectrum and transport properties of the quantum dot embedded between one superconducting and another metallic reservoirs and additionally coupled to an external boson mode. Emission/absorption of the bosonic quanta induces a series of the subgap Andreev states, that eventually interfere with each other. We discuss their signatures in the differential conductance both, for the linear and nonlinear regimes.