Statistical Majorana Bound State Spectroscopy

TL;DR

This paper proposes a new spectroscopic protocol using sequential measurements at different parameters to reliably distinguish Majorana bound states from Andreev bound states in tunnel spectroscopy data.

Contribution

It introduces a sampling method that enhances the reliability of Majorana state detection, addressing misinterpretation issues in existing spectroscopy techniques.

Findings

Sampling resolves the statistics of Andreev side lobes.

Protocol provides clearer evidence for Majorana center peaks.

Method is feasible with current experimental setups.

Abstract

Tunnel spectroscopy data for the detection of Majorana bound states (MBS) is often criticized for its proneness to misinterpretation of genuine MBS with low-lying Andreev bound states. Here, we suggest a protocol removing this ambiguity by extending single shot measurements to sequences performed at varying system parameters. We demonstrate how such sampling, which we argue requires only moderate effort for current experimental platforms, resolves the statistics of Andreev side lobes, thus providing compelling evidence for the presence or absence of a Majorana center peak.