Non-Dirac topological surface states in (SnTe)n≥2(Bi2Te3)m=1
Abstract
A new type of topological spin-helical surface states was discovered in layered van der Waals bonded (SnTe)n=2,3(Bi2Te3)m=1 compounds which comprise two covalently bonded band inverted subsystems, SnTe and Bi2Te3, 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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