Anomalous modulation of a zero bias peak in a hybrid nanowire-superconductor device

TL;DR

This study investigates the behavior of a zero-bias anomaly in an InAs nanowire-superconductor device under high magnetic fields, revealing complex oscillations and splitting that relate to Majorana fermion predictions.

Contribution

It provides experimental observations of ZBA modulation in nanowire devices, exploring potential Majorana signatures and alternative explanations.

Findings

Zero-bias anomaly oscillates with magnetic field and chemical potential

ZBA can split and reform under varying conditions

Results relate to Majorana fermion predictions in hybrid nanowires

Abstract

We report on sub-gap transport measurements of an InAs nanowire coupled to niobium nitride leads at high magnetic fields. We observe a zero-bias anomaly (ZBA) in the differential conductance of the nanowire for certain ranges of magnetic field and chemical potential. The ZBA can oscillate in width with either magnetic field or chemical potential; it can even split and reform. We discuss how our results relate to recent predictions of hybridizing Majorana fermions in semiconducting nanowires, while considering more mundane explanations.