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A new type of topological spin-helical surface states was discovered inlayered van der Waals bonded (SnTe)$_{n=2,3}$(Bi$_2$Te$_3$)$_{m=1}$ compoundswhich comprise two covalently bonded band inverted subsystems, SnTe andBi$_2$Te$_3$, within a building block. This novel topological statesdemonstrate non-Dirac dispersion within the band gap. The dispersion of thesurface state has two linear sections of different slope with shoulder featurebetween them. Such a dispersion of the topological surface state enableseffective switch of the velocity of topological carriers by means of applyingan external electric field.

Non-Dirac topological surface states in (SnTe)$_{n\geq2}$(Bi$_2$Te$_3$)$_{m=1}$