Two-dimensional topological insulators with large bulk energy gap

Yang Z Q^{1, 2}, Jia Jin-Feng^{1, 2}, Qian Dong^{1, 2, †,}

Crystal structure and 1D edge state of 2D layer of Bi₁₄Rh₃I₉, from Ref. [26]. (a) Bi₁₄Rh₃I₉ consists of 2D (Bi₄Rh)₃I layers alternating with Bi₂I₈ space layers. (b) On the cleaved surface, 2D layers and space layers are both observed. (c) STS of different positions. Sharp feature from 1D edge state was observed on the edge of 2D (Bi₄Rh)₃I layer.