An isolated Dirac cone on the surface of ternary tetradymite-like topological insulators

Abstract

We have extended the search for topological insulators to the ternary tetradymite-like compounds M2X2Y (M = Bi or Sb; X and Y = S, Se or Te), which are variations of the well-known binary compounds Bi2Se3 and Bi2Te3. Our first-principles computations suggest that five existing compounds are strong topological insulators with a single Dirac cone on the surface. In particular, stoichiometric Bi2Se2S, Sb2Te2Se and Sb2Te2S are predicted to have an isolated Dirac cone on their naturally cleaved surface. This finding paves the way for the realization of the topological transport regime.

arXiv comment4 pages, 3 figures

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Cited by in corpus (17)

• Colloquium: Topological Band Theory
• Topological Surface States and Dirac point tuning in ternary Bi2Te2Se class of topological insulators
• Bi2Te1.6S1.4 - a Topological Insulator in the Tetradymite Family
• Observation of Zeeman effect in topological surface state with distinct material dependence
• Unusual magnetic phases in the strong interaction limit of two-dimensional topological band insulators in transition metal oxides
• Three-dimensional topological insulators: A review on host materials
• Quantum oscillations in metallic Sb2Te2Se topological insulator
• Weak antilocalization effect due to topological surface states in Bi${}_2$Se${}_{2.1}$Te${}_{0.9}$
• Dirac states with knobs on: interplay of external parameters and the surface electronic properties of 3D topological insulators
• Large magnetothermopower and Fermi surface reconstruction in Sb${}_2$Te${}_2$Se
• Adiabatic transformation as a search tool for new topological insulators: distorted ternary Li${}_2$AgSb-class semiconductors and related compounds
• Two-dimensional magnetotransport in Bi2Te2Se nanoplatelets
• Topological phase transition and two dimensional topological insulators in Ge-based thin films
• Role of surface termination in realizing well-isolated topological surface states within the bulk band gap in TlBiSe${}_2$ and TlBiTe${}_2$
• Positron surface state as a spectroscopic probe for characterizing surfaces of topological insulator materials
• Ultrafast dynamics of photocurrents in surface states of 3D topological insulators
• Converting topological insulators into topological metals within the tetradymite family