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Superconducting order parameter pi-phase shift in magnetic impurity wires
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. os Alamos National Laboratory, United States; ETH Institute for Theoretical Studies, Switzerland.
2017 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 95, no 10, 104521Article in journal (Refereed) Published
Abstract [en]

It has previously been found that amagnetic impurity in a conventional s-wave superconductor can give rise to a local pi-phase shift of the superconducting order parameter. By studying a finite wire of ferromagnetic impurities, we are able to trace the origin of the pi-phase shift to a resonance condition for the Bogoliubov-de Gennes quasiparticle states. When nonresonating states localized at the impurity sites are pulled into the condensate for increasing magnetic strength, the superconducting order parameter is reduced in discrete steps, eventually resulting in a pi-phase shift. We also show that for a finite spin-orbit coupling, the pi-phase shift is preserved and occurs in a large portion of the topologically nontrivial phase.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2017. Vol. 95, no 10, 104521
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:kth:diva-206288DOI: 10.1103/PhysRevB.95.104521ISI: 000399139300006Scopus ID: 2-s2.0-85016928343OAI: oai:DiVA.org:kth-206288DiVA: diva2:1094269
Note

QC 20170509

Available from: 2017-05-09 Created: 2017-05-09 Last updated: 2017-05-09Bibliographically approved

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Balatsky, Alexander V.
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