Topological Kondo Device for distinguishing Quasi-Majorana and Majorana signatures

TL;DR

This paper proposes a simple nanowire device that can distinguish Majorana zero modes from quasi-Majorana modes by analyzing their different transport signatures, aiding in the verification of topological quantum states.

Contribution

The authors introduce a device that leverages the topological Kondo effect to differentiate between MZMs and QMMs in a straightforward manner.

Findings

Device shows clear evidence of topological Kondo effect with QMMs in trivial phase

Transport signatures differ significantly between MZMs and QMMs

Method provides a practical way to verify Majorana signatures

Abstract

To confirm the Majorana signatures, significant effort has been devoted to distinguishing between Majorana zero modes (MZMs) and spatially separated quasi-Majorana modes (QMMs). Because both MZMs and QMMs cause a quantized zero-bias peak in the conductance measurement, their verification task is thought to be very difficult. Here, we proposed a simple device with a single nanowire, where the device could develop clear evidence of the topological Kondo effect in the topologically trivial phase with four QMMs. On the other hand, in the topological superconducting phase with MZMs, the transport signatures are significantly different. Therefore, our scheme provides a simple way to distinguish Majorana and quasi-Majorana modes.