Coexistence of a spin–valley-coupled Dirac semimetal and robust quantum spin Hall state with significant Rashba spin-splitting in a halogenated BiAs film

Abstract

We predict multiple topological phases in a d-ClBiAsI monolayer through first-principles calculations. It harbors an exceptionally uncommon spin–valley-coupled Dirac semimetal (svc-DSM) state under modest tensile strain.