Two-dimensional topological insulators with large bulk energy gap

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

Surface morphology and electronic structure of single-bilayer Bi(111) films grown on Bi₂Te₃, from Ref. [21]. (a) STM morphology of single-bilayer Bi(111)/Bi₂Te₃. (b) ARPES spectra overlaid with DFT calculations. (c) 1D edge state and bulk energy gap of single-bilayer Bi(111)/Bi₂Te₃.