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Odd-frequency superconducting pairing and subgap density of states at the edge of a two-dimensional topological insulator without magnetism
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.
2017 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 96, no 15, article id 155426Article in journal (Refereed) Published
Abstract [en]

We investigate the emergence and consequences of odd-frequency spin-triplet s-wave pairing in superconducting hybrid junctions at the edge of a two-dimensional topological insulator without any magnetism. More specifically, we consider several different normal-superconductor hybrid systems at the topological insulator edge, where spin-singlet s-wave superconducting pairing is proximity induced from an external conventional superconductor. We perform fully analytical calculations and show that odd-frequency mixed spin-triplet s-wave pairing arises due to the unique spin-momentum locking in the topological insulator edge state and the naturally nonconstant pairing potential profile in hybrid systems. Importantly, we establish a one-to-one correspondence between the local density of states (LDOS) at low energies and the odd-frequency spin-triplet pairing in NS, NSN, and SNS junctions along the topological insulator edge; at interfaces the enhancement in the LDOS can directly be attributed to the contribution of odd-frequency pairing. Furthermore, in SNS junctions we show that the emergence of the zero-energy LDOS peak at the superconducting phase phi = pi is associated purely with odd-frequency pairing in the middle of the junction.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2017. Vol. 96, no 15, article id 155426
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-338519DOI: 10.1103/PhysRevB.96.155426ISI: 000412699800006OAI: oai:DiVA.org:uu-338519DiVA, id: diva2:1173883
Funder
Swedish Research CouncilGöran Gustafsson Foundation for Research in Natural Sciences and MedicineSwedish Foundation for Strategic Research Knut and Alice Wallenberg FoundationAvailable from: 2018-01-15 Created: 2018-01-15 Last updated: 2018-01-15Bibliographically approved

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Cayao, JorgeBlack-Schaffer, Annica M.

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