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

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...

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Bibliographic Details
Published in:Beilstein journal of nanotechnology 2018-05, Vol.9 (1), p.1512-1526
Main Authors: Stanescu, Tudor D, Sitek, Anna, Manolescu, Andrei
Format: Article
Language:English
Subjects:
core–shell nanowires
Critical field (superconductivity)
Energy
Full Research Paper
Hybrid systems
Localization
Magnetic fields
Majorana states
multiple 1D chains
Nanoscience
Nanotechnology
Nanowires
Organic chemistry
Phase transitions
Physics
prismatic geometry
Superconductivity
topological superconducting phase
Wire
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Summary: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.
ISSN:2190-4286
2190-4286
DOI:10.3762/bjnano.9.142