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.
Highlights
The hybrid superconductor-semiconductor nanowire system is the prime candidate to realize, control, and manipulate Majorana zero modes (MZMs) for topological quantum information processing [1,2,3]
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
Summary
Original content from this 4 Materials Department, University of California, Santa Barbara, CA 93106, United States of America work may be used under 5 Electrical and Computer Engineering, University of California, Santa Barbara, CA 93106, United States of America the terms of the Creative 6 Microsoft Station Q at Delft University of Technology, 2600 GA Delft, The Netherlands. Commons Attribution 3.0 7 These authors contributed to this work
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