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

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.

Non-Dirac topological surface states in (SnTe) $_{n \geq 2}$ (Bi $_{2}$ Te $_{3}$ ) $_{m = 1}$

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Non-Dirac topological surface states in (SnTe) $_{n \geq 2}$ (Bi $_{2}$ Te $_{3}$ ) $_{m = 1}$

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Non-Dirac topological surface states in (SnTe)n≥2n≥2​(Bi22​Te33​)m=1m=1​

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Non-Dirac topological surface states in (SnTe)n≥2n≥2​(Bi22​Te33​)m=1m=1​

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Non-Dirac topological surface states in (SnTe) $_{n \geq 2}$ (Bi $_{2}$ Te $_{3}$ ) $_{m = 1}$

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Non-Dirac topological surface states in (SnTe) $_{n \geq 2}$ (Bi $_{2}$ Te $_{3}$ ) $_{m = 1}$

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