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Spin-polarized edge currents and Majorana fermions in one- and two-dimensional topological superconductors
KTH, Centra, Nordic Institute for Theoretical Physics NORDITA.
KTH, Centra, Nordic Institute for Theoretical Physics NORDITA. Los Alamos National Laboratory, United States.
2015 (engelsk)Inngår i: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 92, nr 21, artikkel-id 214501Artikkel i tidsskrift (Fagfellevurdert) Published
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Abstract [en]

We investigate the persistent currents, spin-polarized local density of states, and spectral functions of topological superconductors constructed by placing ferromagnetic impurities on top of an s-wave superconductor with Rashba spin-orbit interaction. We solve self-consistently for the superconducting order parameter and investigate both two-dimensional blocks and one-dimensional wires of ferromagnetic impurities, with the magnetic moments pointing both perpendicular and parallel to the surface. We find that the topologically protected edge states of ferromagnetic blocks give rise to spin-polarized edge currents, but that the total persistent current flows in opposite direction to what is expected from the dispersion relation of the edge states. We also show that the Majorana fermions at the end points of one-dimensional wires are spin polarized, which can be directly related to the spin polarization of the edge currents of two-dimensional blocks. Connections are also made to the physics of the Yu-Shiba-Rusinov states for zero-dimensional impurities.

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American Physical Society , 2015. Vol. 92, nr 21, artikkel-id 214501
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URN: urn:nbn:se:kth:diva-180119DOI: 10.1103/PhysRevB.92.214501ISI: 000365773700002Scopus ID: 2-s2.0-84951179507OAI: oai:DiVA.org:kth-180119DiVA, id: diva2:894106
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QC 20160114

Tilgjengelig fra: 2016-01-14 Laget: 2016-01-07 Sist oppdatert: 2017-11-30bibliografisk kontrollert

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Pershoguba, Sergey S.Balatsky, Alexander V.
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