Manipulation of Topological States and the Bulk Band Gap Using Natural Heterostructures of a Topological Insulator
Manipulation of Topological States and the Bulk Band Gap Using Natural Heterostructures of a Topological Insulator
We have performed angle-resolved photoemission spectroscopy on (PbSe)5(Bi2Se3)3m, which forms a natural multilayer heterostructure consisting of a topological insulator (TI) and an ordinary insulator. For m = 2, we observed a gapped Dirac-cone state within the bulk-band gap, suggesting that the topological interface states are effectively encapsulated by block layers; …