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Berezinskii–Kosterlitz–Thouless Transition in the Type‑I Weyl Semimetal PtBi<sub>2</sub>
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