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Microscopic analysis of topological superconductivity in ferromagnetic hybrid nanowires | | Samuel D. Escribano
; Elsa Prada
; Yuval Oreg
; Alfredo Levy Yeyati
; | | Date: |
12 Nov 2020 | | Abstract: | Hybrid semiconducting nanowire devices combining epitaxial superconductor and
ferromagnetic insulator layers have been recently explored experimentally as an
alternative platform for topological superconductivity at zero applied magnetic
field. In this proof-of-principle work we show that the topological regime can
be reached in actual devices depending on some geometrical constraints. To this
end, we perform numerical simulations of InAs wires in which we explicitly
include the superconducting Al and magnetic EuS shells, as well as the
interaction with the electrostatic environment at a self-consistent mean-field
level. Our calculations indicate that the topological phase is achieved in
significant portions of the phase diagram only in configurations where the Al
and EuS layers overlap on some wire facet due to their rather local induced
proximity effects. Moreover, we find that the spin polarization induced
directly in the semiconductor by the EuS is much stronger than the one induced
indirectly through the superconductor. Finally, we comment on how the
topological phase can be tuned and optimized using external gates. | | Source: | arXiv, 2011.06566 | | Services: | Forum | Review | PDF | Favorites | |
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