Unconventional superconductivity in a doped quantum spin Hall insulator

Abstract

A monolayer of jacutingaite (Pt${}_2$HgSe${}_3$) has recently been identified as a novel quantum spin Hall insulator. By first-principles calculations, we study its Fermiology in the doped regime and unveil a type-I and type-II van Hove singularity for hole and electron doping, respectively. We find that the common link between the propensity for a topological band gap at pristine filling and unconventional superconductivity at finite doping roots in the longer ranged hybridization integrals on the honeycomb lattice. In a combined effort of random phase approximation and functional renormalization group, we find chiral $d$-wave order for the type-I and odd-parity $f$-wave order for the type-II regime.

arXiv comment5 pages, 4 figures, Supplemental Material

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• Gate-tunable imbalanced Kane-Mele model in encapsulated bilayer jacutingaite
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