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

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arxiv 1904.00408 v1 pith:DOKR6RV7 submitted 2019-03-31 cond-mat.supr-con

Weipeng Chen , Jin An This is my paper · ORCID
classification cond-mat.supr-con
keywords trilayermonolayermirrormixingpairingstatestatessuperconductivity
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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.

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