Effect of Interdots Electronic Repulsion in the Majorana Signature for a Double Dot Interferometer

TL;DR

This paper theoretically examines how Coulomb repulsion between quantum dots affects the Majorana zero-bias peak in a double dot interferometer, revealing that interactions influence the Majorana state lifetime and peak width.

Contribution

It extends previous models by including Coulomb interactions, showing their impact on Majorana signatures in a double quantum dot system.

Findings

Coulomb repulsion alters the width of the Majorana peak in resonance conditions.

Energy level swapping in off-resonance cases modifies the Majorana peak width.

Electronic correlations influence the Majorana state lifetime.

Abstract

We investigate theoretically the features of the Majorana hallmark in the presence of Coulomb repulsion between two quantum dots describing a spinless Aharonov-Bohm-like interferometer, where one of the dots is strongly coupled to a Kitaev wire within the topological phase. Such a system has been originally proposed without Coulomb interaction in J. of Appl. Phys. 116, 173701 (2014). Our findings reveal that for dots in resonance, the ratio between the strength of Coulomb repulsion and the dot-wire coupling changes the width of the Majorana zero-bias peak for both Fano regimes studied, indicating thus that the electronic interdots correlation influences the Majorana state lifetime in the dot hybridized with the wire. Moreover, for the off-resonance case, the swap between the energy levels of the dots also modifies the width of the Majorana peak, which does not happen for the noninteracting case. The results obtained here can guide experimentalists that pursuit a way of revealing Majorana signatures.