Room-temperature quantum spin Hall edge state in a higher-order topological insulator Bi${}_4$Br${}_4$

Nana Shumiya, Md Shafayat Hossain, Jia-Xin Yin +24

Room-temperature realization of macroscopic quantum phenomena is one of the major pursuits in fundamental physics. The quantum spin Hall state, a topological quantum phenomenon tha…