Regensburg 2019 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 38: Methods in Computational Materials Modelling (methodological aspects, numerics)

MM 38.5: Talk

Thursday, April 4, 2019, 16:00–16:15, H44

Unconventional superconductivity in a doped quantum spin Hall insulator — xianxin wu, mario fink, werner hanke, ronny thomale, and •domenico di sante — Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Am Hubland Campus Süd, Würzburg 97074, Germany

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 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.