2, ShanghaiTech University, Shanghai, , China
Due to its large bulk band gap, bismuthene on SiC offers intriguing new opportunities for room-temperature quantum spin Hall (QSH) applications. Although edge states have been observed in the local density of states (LDOS), there has been no experimental evidence until now that they are spin polarized and topologically protected. We predict experimentally testable fingerprints of these properties originating from magnetic fields, such as changes in the LDOS and in ballistic magnetotransport. In particular, for armchair edges, experimentally accessible, we find a distinct difference of behavior under out-of-plane (gap opening of a few meV between the QSH states) and in-plane (no or tiny gap) fields. While we focus here on bismuthene on SiC, our main findings should also be applicable to other honeycomb-lattice-based QSH systems.