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Article Dans Une Revue Nano Letters Année : 2023

Bereziskii-Kosterlitz-Thouless transition in the Weyl system PtBi2

Transition Bereziskii-Kosterlitz-Thouless dans des nanostructures du semimétal de Weyl PtBi2

Résumé

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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hal-03406707 , version 1 (29-11-2021)

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Arthur Veyrat, Valentin Labracherie, Dima Bashlakov, Federico Caglieris, Jorge Facio, et al.. Bereziskii-Kosterlitz-Thouless transition in the Weyl system PtBi2. Nano Letters, 2023, 23 (4), pp.1229-1235. ⟨10.1021/acs.nanolett.2c04297⟩. ⟨hal-03406707⟩
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