Fano-type interference in quantum dots coupled between metallic and superconducting leads

TL;DR

This paper investigates Fano-type interference effects in charge transport through double quantum dots connected to superconducting and metallic leads, focusing on how proximity-induced pairing influences conductance in the subgap regime.

Contribution

It provides a detailed analysis of quantum interference and Fano lineshapes in Andreev conductance within a T-shaped quantum dot setup, considering proximity effects and correlations.

Findings

Fano lineshapes can emerge in Andreev conductance under specific conditions.

Proximity effect induces pairing in quantum dots, affecting charge transport.

Interplay between interference and strong correlations influences conductance features.

Abstract

We analyze the quantum interference effects appearing in the charge current through the double quantum dots coupled in T-shape configuration to an isotropic superconductor and metallic lead. Owing to proximity effect the quantum dots inherit a pairing which has the profound influence on nonequilibrium charge transport, especially in the subgap regime |eV| < Delta. We discuss under what conditions the Fano-type lineshapes might appear in such Andreev conductance and consider a possible interplay with the strong correlation effects.