Odd-frequency superconducting pairing in topological insulators
2012 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 86, no 14, 144506- p.Article in journal (Refereed) Published
We discuss the appearance of odd-frequency spin-triplet s-wave superconductivity, first proposed by Berezinskii [J. Exp. Theor. Phys. 20, 287 (1974)], on the surface of a topological insulator proximity coupled to a conventional spin- singlet s-wave superconductor. Using both analytical and numerical methods, we show that this disorder robust odd-frequency state is present whenever there is an in-surface gradient in the proximity induced gap, including superconductor-normal state junctions. The time-independent order parameter for the odd-frequency superconductor is proportional to the in-surface gap gradient. The induced odd-frequency component does not produce any low-energy states.
Place, publisher, year, edition, pages
2012. Vol. 86, no 14, 144506- p.
ferromagnet structures, surface
IdentifiersURN: urn:nbn:se:uu:diva-184636DOI: 10.1103/PhysRevB.86.144506ISI: 000309578000005OAI: oai:DiVA.org:uu-184636DiVA: diva2:567499