Observation of a topological crystalline insulator phase and topological phase transition in Pb1-xSnx Te

Su Yang Xu, Chang Liu, N. Alidoust, M. Neupane, D. Qian, I. Belopolski, J. D. Denlinger, Y. J. Wang, H. Lin, L. A. Wray, G. Landolt, B. Slomski, J. H. Dil, A. Marcinkova, E. Morosan, Q. Gibson, R. Sankar, F. C. Chou, R. J. Cava, A. BansilM. Z. Hasan

    Research output: Contribution to journalArticle

    Abstract

    A topological insulator protected by time-reversal symmetry is realized via spin-orbit interaction-driven band inversion. The topological phase in the Bi1-xSbx system is due to an odd number of band inversions. A related spin-orbit system, the Pb1-xSnx Te, has long been known to contain an even number of inversions based on band theory. Here we experimentally investigate the possibility of a mirror symmetry-protected topological crystalline insulator phase in the Pb 1-xSnx Te class of materials that has been theoretically predicted to exist in its end compound SnTe. Our experimental results show that at a finite Pb composition above the topological inversion phase transition, the surface exhibits even number of spin-polarized Dirac cone states revealing mirror-protected topological order distinct from that observed in Bi 1-xSbx. Our observation of the spin-polarized Dirac surface states in the inverted Pb1-xSnx Te and their absence in the non-inverted compounds related via a topological phase transition provide the experimental groundwork for opening the research on novel topological order in quantum devices.

    Original languageEnglish (US)
    Article number1192
    JournalNature Communications
    Volume3
    DOIs
    StatePublished - 2012

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    Phase Transition
    Orbit
    Mirrors
    Orbits
    Phase transitions
    Observation
    insulators
    inversions
    Crystalline materials
    Crystal symmetry
    Surface states
    Cones
    mirrors
    Equipment and Supplies
    symmetry
    spin-orbit interactions
    Chemical analysis
    Research
    cones
    orbits

    ASJC Scopus subject areas

    • Biochemistry, Genetics and Molecular Biology(all)
    • Chemistry(all)
    • Physics and Astronomy(all)

    Cite this

    Xu, S. Y., Liu, C., Alidoust, N., Neupane, M., Qian, D., Belopolski, I., ... Hasan, M. Z. (2012). Observation of a topological crystalline insulator phase and topological phase transition in Pb1-xSnx Te. Nature Communications, 3, [1192]. https://doi.org/10.1038/ncomms2191

    Observation of a topological crystalline insulator phase and topological phase transition in Pb1-xSnx Te. / Xu, Su Yang; Liu, Chang; Alidoust, N.; Neupane, M.; Qian, D.; Belopolski, I.; Denlinger, J. D.; Wang, Y. J.; Lin, H.; Wray, L. A.; Landolt, G.; Slomski, B.; Dil, J. H.; Marcinkova, A.; Morosan, E.; Gibson, Q.; Sankar, R.; Chou, F. C.; Cava, R. J.; Bansil, A.; Hasan, M. Z.

    In: Nature Communications, Vol. 3, 1192, 2012.

    Research output: Contribution to journalArticle

    Xu, SY, Liu, C, Alidoust, N, Neupane, M, Qian, D, Belopolski, I, Denlinger, JD, Wang, YJ, Lin, H, Wray, LA, Landolt, G, Slomski, B, Dil, JH, Marcinkova, A, Morosan, E, Gibson, Q, Sankar, R, Chou, FC, Cava, RJ, Bansil, A & Hasan, MZ 2012, 'Observation of a topological crystalline insulator phase and topological phase transition in Pb1-xSnx Te', Nature Communications, vol. 3, 1192. https://doi.org/10.1038/ncomms2191
    Xu, Su Yang ; Liu, Chang ; Alidoust, N. ; Neupane, M. ; Qian, D. ; Belopolski, I. ; Denlinger, J. D. ; Wang, Y. J. ; Lin, H. ; Wray, L. A. ; Landolt, G. ; Slomski, B. ; Dil, J. H. ; Marcinkova, A. ; Morosan, E. ; Gibson, Q. ; Sankar, R. ; Chou, F. C. ; Cava, R. J. ; Bansil, A. ; Hasan, M. Z. / Observation of a topological crystalline insulator phase and topological phase transition in Pb1-xSnx Te. In: Nature Communications. 2012 ; Vol. 3.
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    abstract = "A topological insulator protected by time-reversal symmetry is realized via spin-orbit interaction-driven band inversion. The topological phase in the Bi1-xSbx system is due to an odd number of band inversions. A related spin-orbit system, the Pb1-xSnx Te, has long been known to contain an even number of inversions based on band theory. Here we experimentally investigate the possibility of a mirror symmetry-protected topological crystalline insulator phase in the Pb 1-xSnx Te class of materials that has been theoretically predicted to exist in its end compound SnTe. Our experimental results show that at a finite Pb composition above the topological inversion phase transition, the surface exhibits even number of spin-polarized Dirac cone states revealing mirror-protected topological order distinct from that observed in Bi 1-xSbx. Our observation of the spin-polarized Dirac surface states in the inverted Pb1-xSnx Te and their absence in the non-inverted compounds related via a topological phase transition provide the experimental groundwork for opening the research on novel topological order in quantum devices.",
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    AU - Alidoust, N.

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    AU - Qian, D.

    AU - Belopolski, I.

    AU - Denlinger, J. D.

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    AU - Gibson, Q.

    AU - Sankar, R.

    AU - Chou, F. C.

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