Majorana Bound States hallmark in a quantum topological interferometer ring

TL;DR

This paper studies a quantum topological interferometer with a quantum dot coupled to Majorana Bound States, revealing unique conductance and noise signatures that serve as hallmarks of Majorana physics.

Contribution

It demonstrates how conductance, shot noise, and Fano factor can uniquely identify Majorana Bound States in a topological superconductor ring.

Findings

Zero-bias conductance of e^2/2h as a Majorana signature

Distinct shot noise features associated with MBSs

Fano factor provides additional distinguishing information

Abstract

In this work, we investigate the conductance and current correlations properties of a quantum topological inteferometer consisting of a QD coupled to two Majorana Bound States (MBSs) confined at both ends of a 1D topological superconductor ring nanowire. We analyze the ring in its topological non trivial and trivial phases to show that the tunneling conductance, shot noise and fano factor present unique characteristics to distinguish the hallmark of MBSs. We reinforce our findings by taking advantage of the correspondence between the quantum topological interferometer and a dot effectively coupled to a single Majorana state in a straight topological superconductor wire configuration. We show that, besides the characteristic zero-bias conductance $e^{2} /2h$ and the already known shot noise features, the Fano factor provides significant information to distinguish the MBSs presence.