Adiabatic transformation as a search tool for new topological insulators: Distorted ternary Li2AgSb-class semiconductors and related compounds

Hsin Lin, Tanmoy Das, Yung Jui Wang, L. A. Wray, S. Y. Xu, M. Z. Hasan, A. Bansil

    Research output: Contribution to journalArticle

    Abstract

    We demonstrate that the first-principles based adiabatic continuation approach is a very powerful and efficient tool for constructing topological phase diagrams and locating nontrivial topological insulator materials. Using this technique, we predict that the ternary intermetallic series Li 2M'X, where M=Cu, Ag, Au, or Cd and X=Sb, Bi, or Sn, hosts a number of topological insulators with remarkable functional variants and tunability. We also predict that several III-V semimetallic compounds are topologically nontrivial. We construct a topological phase diagram in the parameter space of the atomic numbers of atoms in Li 2M'X compounds, which places a large number of topological materials presented in this work as well as in earlier studies within a single unified topological framework. Our results demonstrate the efficacy of adiabatic continuation as a useful tool for exploring topologically nontrivial alloying systems and for identifying new topological insulators even when the underlying lattice does not possess inversion symmetry, and the approaches based on parity analysis are not viable.

    Original languageEnglish (US)
    Article number121202
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume87
    Issue number12
    DOIs
    StatePublished - Mar 12 2013

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

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