Topological superconductivity and anti-Shiba states in disordered chains of magnetic adatoms

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Topological superconductivity and anti-Shiba states in disordered chains of magnetic adatoms. / Westström, Alex; Pöyhönen, Kim; Ojanen, Teemu.

In: Physical Review B, Vol. 94, No. 10, 104519, 23.09.2016, p. 1-12.

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@article{566f93798545413e89b427b97f033e6d,
title = "Topological superconductivity and anti-Shiba states in disordered chains of magnetic adatoms",
abstract = "Regular arrays of magnetic atoms on a superconductor provide a promising platform for topological superconductivity. In this work, we study the effects of disorder in these systems, focusing on vacancies realized by missing magnetic atoms. We develop approaches that allow treatment of ferromagnetic dense chains as well as long-range hopping ferromagnetic and helical Shiba chains at arbitrary subgap energies. Vacancies in magnetic chains play an analogous role to magnetic impurities in a clean s-wave superconductor. A single vacancy in a topological chain gives rise to a low-lying {"}anti-Shiba{"} state below the band edge of a regular magnetic chain. Proliferation of the anti-Shiba band formed by a finite density of hybridized vacancy states leads to deterioration of the topological phase, which exhibits unusual fragility in a particular parameter region in dilute chains. We also consider local fluctuation in the Shiba coupling and discuss how vacancy states could contribute to experimental verification of topological superconductivity.",
author = "Alex Weststr{\"o}m and Kim P{\"o}yh{\"o}nen and Teemu Ojanen",
year = "2016",
month = "9",
day = "23",
doi = "10.1103/PhysRevB.94.104519",
language = "English",
volume = "94",
pages = "1--12",
journal = "Physical Review B (Condensed Matter and Materials Physics)",
issn = "2469-9950",
publisher = "American Physical Society",
number = "10",

}

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TY - JOUR

T1 - Topological superconductivity and anti-Shiba states in disordered chains of magnetic adatoms

AU - Westström, Alex

AU - Pöyhönen, Kim

AU - Ojanen, Teemu

PY - 2016/9/23

Y1 - 2016/9/23

N2 - Regular arrays of magnetic atoms on a superconductor provide a promising platform for topological superconductivity. In this work, we study the effects of disorder in these systems, focusing on vacancies realized by missing magnetic atoms. We develop approaches that allow treatment of ferromagnetic dense chains as well as long-range hopping ferromagnetic and helical Shiba chains at arbitrary subgap energies. Vacancies in magnetic chains play an analogous role to magnetic impurities in a clean s-wave superconductor. A single vacancy in a topological chain gives rise to a low-lying "anti-Shiba" state below the band edge of a regular magnetic chain. Proliferation of the anti-Shiba band formed by a finite density of hybridized vacancy states leads to deterioration of the topological phase, which exhibits unusual fragility in a particular parameter region in dilute chains. We also consider local fluctuation in the Shiba coupling and discuss how vacancy states could contribute to experimental verification of topological superconductivity.

AB - Regular arrays of magnetic atoms on a superconductor provide a promising platform for topological superconductivity. In this work, we study the effects of disorder in these systems, focusing on vacancies realized by missing magnetic atoms. We develop approaches that allow treatment of ferromagnetic dense chains as well as long-range hopping ferromagnetic and helical Shiba chains at arbitrary subgap energies. Vacancies in magnetic chains play an analogous role to magnetic impurities in a clean s-wave superconductor. A single vacancy in a topological chain gives rise to a low-lying "anti-Shiba" state below the band edge of a regular magnetic chain. Proliferation of the anti-Shiba band formed by a finite density of hybridized vacancy states leads to deterioration of the topological phase, which exhibits unusual fragility in a particular parameter region in dilute chains. We also consider local fluctuation in the Shiba coupling and discuss how vacancy states could contribute to experimental verification of topological superconductivity.

UR - http://www.scopus.com/inward/record.url?scp=84991000787&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.94.104519

DO - 10.1103/PhysRevB.94.104519

M3 - Article

VL - 94

SP - 1

EP - 12

JO - Physical Review B (Condensed Matter and Materials Physics)

JF - Physical Review B (Condensed Matter and Materials Physics)

SN - 2469-9950

IS - 10

M1 - 104519

ER -

ID: 9025944