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Currents Induced by Magnetic Impurities in Superconductors with Spin-Orbit Coupling
KTH Royal Inst Technol, Ctr Quantum Mat, Nordita, S-10691 Stockholm, Sweden.;Stockholm Univ, S-10691 Stockholm, Sweden..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
KTH Royal Inst Technol, Ctr Quantum Mat, Nordita, S-10691 Stockholm, Sweden.;Stockholm Univ, S-10691 Stockholm, Sweden.;Los Alamos Natl Lab, Inst Mat Sci, Los Alamos, NM 87545 USA..
2015 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 115, no 11, 116602Article in journal (Refereed) Published
Abstract [en]

We show that superconducting currents are generated around magnetic impurities and ferromagnetic islands proximity coupled to superconductors with finite spin-orbit coupling. Using the Ginzburg-Landau theory, T-matrix calculation, as well as self-consistent numerical simulation on a lattice, we find a strong dependence of the current on the direction and magnitude of the magnetic moment. We establish that in the case of point magnetic impurities, the current is carried by the induced Yu-Shiba-Rusinov (YSR) subgap states. In the vicinity of the phase transition, where the YSR states cross at zero energy, the current increases dramatically. Furthermore, we show that the currents are orthogonal to the local spin polarization and, thus, can be probed by measuring the spin-polarized local density of states.

Place, publisher, year, edition, pages
2015. Vol. 115, no 11, 116602
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-264046DOI: 10.1103/PhysRevLett.115.116602ISI: 000361040800005PubMedID: 26406845OAI: oai:DiVA.org:uu-264046DiVA: diva2:859201
Funder
EU, European Research Council, DM-321031Swedish Research CouncilSwedish Foundation for Strategic Research
Available from: 2015-10-06 Created: 2015-10-05 Last updated: 2017-12-01Bibliographically approved
In thesis
1. Topological band theory and Majorana fermions: With focus on self-consistent lattice models
Open this publication in new window or tab >>Topological band theory and Majorana fermions: With focus on self-consistent lattice models
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

One of the most central concepts in condensed matter physics is the electronic band structure. Although band theory was established more than 80 years ago, recent developments have led to new insights that are formulated in the framework of topological band theory. In this thesis a subset of topological band theory is presented, with particular focus on topological supercon- ductors and accompanying Majorana fermions. While simple models are used to introduce basic concepts, a physically more realistic model is also studied intensely in the papers. Through self- consistent tight-binding calculations it is confirmed that Majorana fermions appear in vortex cores and at wire end points when the superconductor is in the topologically non-trivial phase. Many other properties such as the topological invariant, experimental signatures in the local density of states and spectral function, unconventional and odd-frequency pairing, the precense of spin-polarized currents and spin-polarization of the Majorana fermions, and a local π-phase shift in the order parameter at magnetic impurities are also investigated. 

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2016. 144 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1441
Keyword
Topology, Majorana, superconductivity, material physics, numerical calculations, tight-binding, mean-field
National Category
Condensed Matter Physics Physical Sciences
Identifiers
urn:nbn:se:uu:diva-305212 (URN)978-91-554-9728-6 (ISBN)
Public defence
2016-12-09, Häggsalen, Ångströmslaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:15 (English)
Opponent
Supervisors
Available from: 2016-11-15 Created: 2016-10-12 Last updated: 2016-11-23

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Björnson, KristoferBlack-Schaffer, Annica M.

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