تقرير
Berezinskii-Kosterlitz-Thouless transition in the type-I Weyl semimetal PtBi$_2$
| العنوان: | Berezinskii-Kosterlitz-Thouless transition in the type-I Weyl semimetal PtBi$_2$ |
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| المؤلفون: | Veyrat, Arthur, Labracherie, Valentin, Bashlakov, Dima L., Caglieris, Federico, Facio, Jorge I., Shipunov, Grigory, Charvin, Titouan, Acharya, Rohith, Naidyuk, Yurii, Giraud, Romain, Brink, Jeroen van den, Büchner, Bernd, Hess, Christian, Aswartham, Saicharan, Dufouleur, Joseph |
| المصدر: | Nano Letters 2023 23 (4), 1229-1235 |
| سنة النشر: | 2021 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Superconductivity, Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science |
| الوصف: | 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 PtBi$_2$ 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 $T_c \sim 275-400$~mK), which constitutes the first report and study of unambiguous superconductivity in a type-I Weyl semimetal. Remarkably, a Berezinskii-Kosterlitz-Thouless transition with $T_\text{BKT} \sim 310$~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 PtBi$_2$ an ideal platform to study low dimensional and unconventional superconductivity in topological semimetals. Comment: to be published in Nano Letters |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1021/acs.nanolett.2c04297 |
| URL الوصول: | http://arxiv.org/abs/2101.01620 |
| رقم الأكسشن: | edsarx.2101.01620 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1021/acs.nanolett.2c04297 |
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