Berezinskii-Kosterlitz-Thouless transition in the type-I Weyl semimetal PtBi_2
arxiv(2021)
Abstract
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 ∼ 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_BKT∼ 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.
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