Two-dimensional topological insulators with large bulk energy gap

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

Crystal and electronic structures of single-layer ZrTe₅, from Ref. [19]. (a) Bulk unit cell of ZrTe_5. ZrTe₅ layer is in the a–c plane. (b) Bulk electronic bands and the 1D edge states in single-layer ZrTe₅ nanoribbon. Red and blue curves are from two different edge morphologies. (c) Energy gap of single-layer ZrTe₅ as a function of external strain.