Quantum transport evidence of the boundary states and Lifshitz transition in Bi${}_4$Br${}_4$

Dong-Yun Chen, Dashuai Ma, Junxi Duan +4

The quasi-one-dimensional van der Waals compound Bi${}_4$Br${}_4$ was recently found to be a promising high-order topological insulator with exotic electronic states. In this paper, we…