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.
Unconventional superconductivity in a doped quantum spin Hall insulator / Wu, X.; Fink, M.; Hanke, W.; Thomale, R.; Di Sante, D.. - In: PHYSICAL REVIEW. B, RAPID COMMUNICATIONS. - ISSN 1089-4896. - ELETTRONICO. - 100:4(2019), pp. 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.