Chiral excitonic order from twofold van Hove singularities in kagome metals

Harley D. Scammell, Julian Ingham, Tommy Li +1

Recent experiments on kagome metals AV${}_3$Sb${}_5$ (A=K,Rb,Cs) [M. Kang et al., Nat. Phys. 18, 301-308 (2022)] identify twofold van Hove singularities (TvHS) with opposite concavity…