Topological Ising pairing states in monolayer and trilayer TaS${}_2$

Abstract

We study the possibility of topological superconductivity in the noncentrosymmetric monolayer and trilayer TaS${}_2$ with out-of-plane mirror symmetry. A gapless time-reversal invariant f+s-wave pairing state with even mirror parity is found to be a promising candidate. This mixing state holds 12(36) nodes at the Fermi pockets around $\Gamma$ for monolayer(trilayer) case and its unconventional superconductivity is consistent with the STM experiments observed in 2$H$-TaS${}_2$ thin flakes. Furthermore, with doping or under uniaxial pressure for trilayer 2$H$-TaS${}_2$, large-Chern-number time-reversal symmetry breaking mixing states between d+id- and p-ip-wave pairings can be realized in the phase diagram.

arXiv comment11 pages, 5 figures

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Cited by in corpus (4)

• Protection of Ising spin-orbit coupling in bulk misfit superconductors
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• Unconventional superconductivity in monolayer transition metal dichalcogenides
• Molecular interpretation of the LHCb pentaquarks from an analysis of $J/\psi p$ spectrum