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Electronic structure of full-shell InAs/Al hybrid semiconductor-superconductor nanowires: Spin-orbit coupling and topological phase space

TitleElectronic structure of full-shell InAs/Al hybrid semiconductor-superconductor nanowires: Spin-orbit coupling and topological phase space
Publication TypeJournal Article
Year of Publication2019
AuthorsB. D. Woods, S. Das Sarma, and T. D. Stanescu
JournalPhys. Rev. B
Volume99
Pagination161118
Date PublishedAPR 26
Type of ArticleArticle
ISSN2469-9950
Abstract

We study the electronic structure of full-shell superconductor-semiconductor nanowires, which have recently been proposed for creating Majorana zero modes, using an eight-band (k) over right arrow . (p) over right arrow model within a fully self-consistent Schrodinger-Poisson scheme. We find that the spin-orbit coupling induced by the intrinsic radial electric field is generically weak for subbands with their minimum near the Fermi energy. Furthermore, we show that the chemical potential windows consistent with the emergence of a topological phase are small and sparse and can only be reached by fine-tuning the diameter of the wire. These findings suggest that the parameter space consistent with the realization of a topological phase in full-shell InAs/Al nanowires is, at best, very narrow.

DOI10.1103/PhysRevB.99.161118