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Superconducting order parameter pi-phase shift in magnetic impurity wires
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Los Alamos National Laboratory, USA; ETH Institute for Theoretical Studies, Switzerland.
Number of Authors: 3
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
2017. Vol. 95, no 10, 104521
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-142632DOI: 10.1103/PhysRevB.95.104521ISI: 000399139300006OAI: oai:DiVA.org:su-142632DiVA: diva2:1095993
Available from: 2017-05-16 Created: 2017-05-16 Last updated: 2017-05-16Bibliographically approved

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Balatsky, Alexander V.
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