Electric field tunable superconductor-semiconductor coupling in Majorana nanowires

Abstract

We study the effect of external electric fields on superconductor-semiconductor coupling by measuring the electron transport in InSb semiconductor nanowires coupled to an epitaxially grown Al superconductor. We find that the gate voltage induced electric fields can greatly modify the coupling strength, which has consequences for the proximity induced superconducting gap, effective g-factor, and spin-orbit coupling, which all play a key role in understanding Majorana physics. We further show that level repulsion due to spin-orbit coupling in a finite size system can lead to seemingly stable zero bias conductance peaks, which mimic the behavior of Majorana zero modes. Our results improve the understanding of realistic Majorana nanowire systems.

arXiv comment10 pages, 5 figures, supplemental information as ancillary file

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Cited by in corpus (56)

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• Physical mechanisms for zero-bias conductance peaks in Majorana nanowires
• InAs-Al Hybrid Devices Passing the Topological Gap Protocol
• Next steps of quantum transport in Majorana nanowire devices
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