Two-dimensional topological insulators with large bulk energy gap

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

Conductance of Bi nanocontact, from Ref. [23]. (a) The proposed process of exfoliating a Bi(111) bilayer (red) after contact with the STM tip. (b) Conductance plateaus of Bi(111) bilayers between tip and substrate.