Non-Dirac topological surface states in (SnTe)${}_{n\ge 2}$(Bi${}_2$Te${}_3$)${}_{m=1}$

Abstract

A new type of topological spin-helical surface states was discovered in layered van der Waals bonded (SnTe)${}_{n=2,3}$(Bi${}_2$Te${}_3$)${}_{m=1}$ compounds which comprise two covalently bonded band inverted subsystems, SnTe and Bi${}_2$Te${}_3$, within a building block. This novel topological states demonstrate non-Dirac dispersion within the band gap. The dispersion of the surface state has two linear sections of different slope with shoulder feature between them. Such a dispersion of the topological surface state enables effective switch of the velocity of topological carriers by means of applying an external electric field.

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Cited by in corpus (1)

• Strong and Weak Three-Dimensional Topological Insulators Probed by Surface Science Methods