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Odd-frequency pairing in a superconductor coupled to two parallel nanowires
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 2, article id 024512Article in journal (Refereed) Published
Abstract [en]

We study the behavior of Cooper pair amplitudes that emerge when a two-dimensional superconductor is coupled to two parallel nanowires, focusing on the conditions for realizing odd-frequency pair amplitudes in the absence of spin-orbit coupling or magnetism. In general, any finite tunneling between the superconductor and the two nanowires induces odd-frequency spin-singlet pair amplitudes in the substrate as well as a substantial odd-frequency interwire pairing, both of which vanish locally. Interestingly, in the regime of strong superconductor-nanowire tunneling, we find that the presence of two nanowires allows for the conversion of nonlocal odd-frequency pairing to local even-frequency pairing. By studying this higher-order symmetry conversion process, we are able to identify a notable effect of the odd-frequency pairing in the superconductor on local quantities accessible by experiments. Specifically, we find that the odd-frequency pairing plays a direct role in the emergence of certain subgap features in the local density of states and, importantly, it is responsible for a reduction of the maximum Josephson current between the two nanowires, measurable using Josephson scanning tunneling microscopy. We discuss ways to control the sizes of these effects induced by odd-frequency superconductivity by tuning the parameters describing the nanowires.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2019. Vol. 100, no 2, article id 024512
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-391938DOI: 10.1103/PhysRevB.100.024512ISI: 000476686100005OAI: oai:DiVA.org:uu-391938DiVA, id: diva2:1346983
Funder
Swedish Research Council, 621-2014-3721Knut and Alice Wallenberg FoundationEU, Horizon 2020, ERC-2017-StG-757553Available from: 2019-08-29 Created: 2019-08-29 Last updated: 2019-08-29Bibliographically approved

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Triola, ChristopherBlack-Schaffer, Annica M.

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