Fano effect and Andreev bound states in T-shape double quantum dots

TL;DR

This paper explores how Andreev bound states induce Fano resonances in a T-shaped double quantum dot system, revealing quantum interference effects and the influence of a superconducting lead on electron transport.

Contribution

It reports the first observation of Fano effect caused by Andreev bound states in a side quantum dot, with analytical expressions for transmission and density of states.

Findings

Fano resonances due to Andreev bound states observed in conductance.

Superconducting lead influences quantum interference in the system.

Analytical expressions for transport properties at zero temperature derived.

Abstract

In this paper, we investigate the transport through a T-shaped double quantum dot coupled to two normal metal leads left and right and a superconducting lead. Analytical expressions of Andreev transmission and local Density of States of the system at zero temperature have been obtained. We study the role of the superconducting lead in the quantum interferometric features of the double quantum dot. We report for first time the Fano effect produced by Andreev bound states in a side quantum dot. Our results show that as a consequence of quantum interference and proximity effect, the transmission from normal to normal lead exhibits Fano resonances due to Andreev bound states. We find that this interference effect allows us to study the Andreev bound states in the changes in the conductance between two normal leads.