A monolayer of jacutingaite (Pt2HgSe3) 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 is rooted 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. When longer-ranged Coulomb interaction is included, a propensity of the type-II regime towards a topological p(x)+ip(y)-wave order emerges.

Wu, X., Fink, M., Hanke, W., Thomale, R., Di Sante, D. (2019). Unconventional superconductivity in a doped quantum spin Hall insulator. PHYSICAL REVIEW. B, RAPID COMMUNICATIONS, 100(4), 041117-041117 [10.1103/PhysRevB.100.041117].

Unconventional superconductivity in a doped quantum spin Hall insulator

Di Sante, D.
Ultimo
2019

Abstract

A monolayer of jacutingaite (Pt2HgSe3) 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 is rooted 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. When longer-ranged Coulomb interaction is included, a propensity of the type-II regime towards a topological p(x)+ip(y)-wave order emerges.
2019
Wu, X., Fink, M., Hanke, W., Thomale, R., Di Sante, D. (2019). Unconventional superconductivity in a doped quantum spin Hall insulator. PHYSICAL REVIEW. B, RAPID COMMUNICATIONS, 100(4), 041117-041117 [10.1103/PhysRevB.100.041117].
Wu, X.; Fink, M.; Hanke, W.; Thomale, R.; Di Sante, D.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/874644
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