Abstract
We report an atomic-scale characterization of by using scanning tunneling microscopy. We observe a bulk band gap of with topological edge states at the step edge and, thus, demonstrate that is a two-dimensional topological insulator. We also find that an applied magnetic field induces an energetic splitting of the topological edge states, which can be attributed to a strong link between the topological edge states and bulk topology. The relatively large band gap makes a potential candidate for future fundamental studies and device applications.
- Received 14 January 2016
DOI:https://doi.org/10.1103/PhysRevLett.116.176803
© 2016 American Physical Society