Van Hove Singularity Arising from Mexican-Hat-Shaped Inverted Bands in the Topological Insulator Sn-doped Bi${}_{1.1}$Sb${}_{0.9}$Te${}_2$S

Wenchao Jiang, Bowen Li, Xiaomeng Wang +9

The optical properties of Sn-doped Bi${}_{1.1}$Sb${}_{0.9}$Te${}_2$S, the most bulk-insulating topological insulator thus far, have been examined at different temperatures over a broad…