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Berezinskii–Kosterlitz–Thouless Transition in the Type-I Weyl Semimetal PtBi2

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Download Hi-Res ImageDownload to MS-PowerPointCite This:Nano Lett. 2023, 23, 4, 1229-1235
    Letter

    Berezinskii–Kosterlitz–Thouless Transition in the Type-I Weyl Semimetal PtBi2
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    • Arthur Veyrat
      Arthur Veyrat
      Leibniz Institute for Solid State and Materials Research (IFW Dresden), Helmholtzstraße 20, D-01069Dresden, Germany
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    • Valentin Labracherie
      Valentin Labracherie
      Leibniz Institute for Solid State and Materials Research (IFW Dresden), Helmholtzstraße 20, D-01069Dresden, Germany
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      Orcidhttps://orcid.org/0000-0002-7573-0724
    • Dima L. Bashlakov
      Dima L. Bashlakov
      B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine (NASU), 47 Nauky Avenue, 61103Kharkiv, Ukraine
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      Orcidhttps://orcid.org/0000-0001-8642-9702
    • Federico Caglieris
      Federico Caglieris
      Department of Physics, University of Genoa, Via Dodecaneso 33, 16146Genova, Italy
      Leibniz Institute for Solid State and Materials Research (IFW Dresden), Helmholtzstraße 20, D-01069Dresden, Germany
      CNR-SPIN, Corso Perrone 24, 16152Genova, Italy
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    • Jorge I. Facio
      Jorge I. Facio
      Leibniz Institute for Solid State and Materials Research (IFW Dresden), Helmholtzstraße 20, D-01069Dresden, Germany
      Centro Atómico Bariloche, Instituto Balseiro and Instituto de Nanociencia y Nanotecnología CNEA-CONICET, CNEA, 8400Bariloche, Argentina
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      Grigory Shipunov
      Leibniz Institute for Solid State and Materials Research (IFW Dresden), Helmholtzstraße 20, D-01069Dresden, Germany
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      Titouan Charvin
      Leibniz Institute for Solid State and Materials Research (IFW Dresden), Helmholtzstraße 20, D-01069Dresden, Germany
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      Rohith Acharya
      Leibniz Institute for Solid State and Materials Research (IFW Dresden), Helmholtzstraße 20, D-01069Dresden, Germany
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      Yurii Naidyuk
      B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine (NASU), 47 Nauky Avenue, 61103Kharkiv, Ukraine
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      Orcidhttps://orcid.org/0000-0001-8301-9353
    • Romain Giraud
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      Leibniz Institute for Solid State and Materials Research (IFW Dresden), Helmholtzstraße 20, D-01069Dresden, Germany
      Université Grenoble Alpes, CNRS, CEA, Grenoble-INP, Spintec, F-38000Grenoble, France
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      Leibniz Institute for Solid State and Materials Research (IFW Dresden), Helmholtzstraße 20, D-01069Dresden, Germany
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    • Bernd Büchner
      Bernd Büchner
      Leibniz Institute for Solid State and Materials Research (IFW Dresden), Helmholtzstraße 20, D-01069Dresden, Germany
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    Nano Letters

    Cite this: Nano Lett. 2023, 23, 4, 1229–1235
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    https://doi.org/10.1021/acs.nanolett.2c04297
    Published January 31, 2023
    Copyright © 2023 American Chemical Society
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    Symmetry breaking in topological matter has become in recent years a key concept in condensed matter physics to unveil novel electronic states. In this work, we predict that broken inversion symmetry and strong spin–orbit coupling in trigonal PtBi2 lead to a type-I Weyl semimetal band structure. Transport measurements show an unusually robust low dimensional superconductivity in thin exfoliated flakes up to 126 nm in thickness (with Tc ∼ 275–400 mK), which constitutes the first report and study of unambiguous superconductivity in a type-I Weyl semimetal. Remarkably, a Berezinskii-Kosterlitz-Thouless transition with TBKT ∼ 310 mK is revealed in up to 60 nm thick flakes, which is nearly an order of magnitude thicker than the rare examples of two-dimensional superconductors exhibiting such a transition. This makes PtBi2 an ideal platform to study low dimensional and unconventional superconductivity in topological semimetals.

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    • Band structure calculations, magnetoresistance in macrostructures, sample fabrication, additional data on the main sample and three other samples, and Ginzburg–Landau equations with misalignment (PDF)

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    Nano Letters

    Cite this: Nano Lett. 2023, 23, 4, 1229–1235
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acs.nanolett.2c04297
    Published January 31, 2023
    Copyright © 2023 American Chemical Society
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