Topological Ising pairing states in monolayer and trilayer TaS2
Abstract
We study the possibility of topological superconductivity in the noncentrosymmetric monolayer and trilayer TaS2 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 for monolayer(trilayer) case and its unconventional superconductivity is consistent with the STM experiments observed in 2H-TaS2 thin flakes. Furthermore, with doping or under uniaxial pressure for trilayer 2H-TaS2, large-Chern-number time-reversal symmetry breaking mixing states between d+id- and p-ip-wave pairings can be realized in the phase diagram.
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