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Microscopic prediction of skyrmion lattice state in clean interface superconductors
KTH, School of Engineering Sciences (SCI), Theoretical Physics, Statistical Physics. University of Massachusetts, USA.
KTH, School of Engineering Sciences (SCI), Theoretical Physics. University of Massachusetts, USA.ORCID iD: 0000-0001-5087-3115
2014 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 90, no 6, 064509- p.Article in journal (Refereed) Published
Abstract [en]

When an in-plane field is applied to a clean interface superconductor, a Fulde-Ferrell-Larkin-Ovchinnikov (FFLO)-like phase is stabilized. This phase has a U(1)xU(1) symmetry and, in principle, this symmetry allows for flux carrying topological excitations different from Abrikosov vortices (which are the simplest defects associated with S-1 --> S-1 maps). However, in practice, largely due to electromagnetic and other intercomponent interactions, such topological excitations are very rare in superconducting systems. Here, we demonstrate that a realistic microscopic theory for interface superconductors, such as SrTiO3/LaAlO3, predicts an unconventional magnetic response where the flux-carrying objects are skyrmions, characterized by homotopy invariants of S-2 --> S-2 maps. Additionally, we show that this microscopic theory predicts that stable fractional vortices form near the boundary of these superconductors. It also predicts the appearance of type-1.5 superconductivity for some range of parameters. Central to these results is the assumption that the Rashba spin-orbit coupling is much larger than the superconducting gap.

Place, publisher, year, edition, pages
2014. Vol. 90, no 6, 064509- p.
Keyword [en]
Field, Insulator, Vortices, Order
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-152582DOI: 10.1103/PhysRevB.90.064509ISI: 000341267500005OAI: diva2:750567
Knut and Alice Wallenberg FoundationSwedish Research Council

QC 20140929

Available from: 2014-09-29 Created: 2014-09-29 Last updated: 2014-09-29Bibliographically approved

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