Two-dimensional topological insulators with large bulk energy gap

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

1D edge state in the step edge of a single-layer ZrTe₅ island on the surface of bulk ZrTe₅, from Ref. [24]. (a) Morphology of single-layer ZrTe₅ step. STS curves obtained from the terrace and the edge. (b) Calculated bulk bands and 1D edge state of a single-layer ZrTe₅ nanoribbon. (c) Full energy gap observed on the terrace. Contributions from 1D edge state were observed near the edge (red curves).