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Robust topological phase in proximitized core–shell nanowires coupled to multiple superconductors

Robust topological phase in proximitized core–shell nanowires coupled to multiple superconductors


Title: Robust topological phase in proximitized core–shell nanowires coupled to multiple superconductors
Author: Stanescu, Tudor D
Sitek, Anna   orcid.org/0000-0002-0602-1959
Manolescu, Andrei   orcid.org/0000-0002-0713-4664
Date: 2018-05-22
Language: English
Scope: 1512-1526
University/Institute: Háskólinn í Reykjavík
Reykjavik University
School: Tækni og Verkfræðideild (HR)
School of Science and Engineering (RU)
Series: Beilstein Journal of Nanotechnology;9
ISSN: 2190-4286 (eISSN)
DOI: 10.3762/bjnano.9.142
Subject: Core-shell nanowires; Majorana states; Multiple 1D chains; Prismatic geometry; Topological superconducting phase; Nanótækni; Rúmfræði; Rafeindaverkfræði; Rafmagnsverkfræði; Majorana fermions
URI: https://hdl.handle.net/20.500.11815/1311

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Citation:

Stanescu, T. D.; Sitek, A.; Manolescu, A. Beilstein J. Nanotechnol. 2018, 9, 1512–1526. doi:10.3762/bjnano.9.142

Abstract:

We consider core–shell nanowires with prismatic geometry contacted with two or more superconductors in the presence of a magnetic field applied parallel to the wire. In this geometry, the lowest energy states are localized on the outer edges of the shell, which strongly inhibits the orbital effects of the longitudinal magnetic field that are detrimental to Majorana physics. Using a tight-binding model of coupled parallel chains, we calculate the topological phase diagram of the hybrid system in the presence of non-vanishing transverse potentials and finite relative phases between the parent superconductors. We show that having finite relative phases strongly enhances the stability of the induced topological superconductivity over a significant range of chemical potentials and reduces the value of the critical field associated with the topological quantum phase transition.

Rights:

This is an Open Access article under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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