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Signature of odd-frequency equal-spin triplet pairing in the Josephson current on the surface of Weyl nodal loop semimetals
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.
2019 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 100, no 10, article id 104511Article in journal (Refereed) Published
Abstract [en]

We theoretically predict proximity-induced odd-frequency (odd-omega) pairing on the surface of a Weyl nodal loop semimetal, characterized by a nodal loop Fermi surface and drumheadlike surface states (DSSs), attached to conventional spin-singlet s-wave superconducting leads. Due to the complete spin polarization of the DSS, only odd-omega equal-spin triplet pairing is present, and we show that it gives rise to a finite Josephson current. Placing an additional ferromagnet in the junction can also generate odd-omega) mixed-spin triplet pairing, but the pairing and current are not affected if the magnetization is orthogonal to the DSS spin polarization, which further confirms the equal-spin structure of the pairing.

Place, publisher, year, edition, pages
2019. Vol. 100, no 10, article id 104511
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-394954DOI: 10.1103/PhysRevB.100.104511ISI: 000485311800006OAI: oai:DiVA.org:uu-394954DiVA, id: diva2:1362682
Funder
Swedish Research Council, 621-2014-3721Knut and Alice Wallenberg FoundationEU, European Research Council, ERC-2017-StG757553Available from: 2019-10-21 Created: 2019-10-21 Last updated: 2019-10-21Bibliographically approved

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Dutta, ParamitaBlack-Schaffer, Annica M.

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