Subsurface impurities and vacancies in a three-dimensional topological insulator
Subsurface impurities and vacancies in a three-dimensional topological insulator
Using a three-dimensional microscopic lattice model of a strong topological insulator (TI) we study potential impurities and vacancies in surface and subsurface positions. For all impurity locations we find impurity-induced resonance states with energy proportional to the inverse of the impurity strength, although the impurity strength needed for a low-energy …