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.
Keywords
Cite
@article{arxiv.1806.00988,
title = {Electric field tunable superconductor-semiconductor coupling in Majorana nanowires},
author = {Michiel W. A. de Moor and Jouri D. S. Bommer and Di Xu and Georg W. Winkler and Andrey E. Antipov and Arno Bargerbos and Guanzhong Wang and Nick van Loo and Roy L. M. Op het Veld and Sasa Gazibegovic and Diana Car and John A. Logan and Mihir Pendharkar and Joon Sue Lee and Erik P. A. M. Bakkers and Chris J. Palmstrøm and Roman M. Lutchyn and Leo P. Kouwenhoven and Hao Zhang},
journal= {arXiv preprint arXiv:1806.00988},
year = {2018}
}
Comments
10 pages, 5 figures, supplemental information as ancillary file