Testing for Majorana Zero Modes in a Px+iPy Superconductor at High Temperature by Tunneling Spectroscopy

TL;DR

This paper proposes a method to detect Majorana zero modes in high-temperature chiral superconductors by comparing tunneling conductance of vortices and antivortices, bypassing the need for extremely high energy resolution.

Contribution

It introduces a novel approach to identify Majorana zero modes through temperature-broadened tunneling conductance measurements at high temperatures.

Findings

Majorana states can be tested by comparing vortex and antivortex conductance.

The method works even at temperatures much higher than the core state spacing.

Provides a practical way to observe Majorana modes without ultra-high energy resolution.

Abstract

Directly observing a zero energy Majorana state in the vortex core of a chiral superconductor by tunneling spectroscopy requires energy resolution better than the spacing between core states $\Delta^2/eF$. We show that nevertheless, its existence can be decisively tested by comparing the temperature broadened tunneling conductance of a vortex with that of an antivortex even at temperatures $T >> \Delta^2/eF$.