Observation of dirac node formation and mass acquisition in a topological crystalline insulator

Yoshinori Okada, Maksym Serbyn, Hsin Lin, Daniel Walkup, Wenwen Zhou, Chetan Dhital, Madhab Neupane, Suyang Xu, Yung Jui Wang, R. Sankar, Fangcheng Chou, Arun Bansil, M. Zahid Hasan, Stephen D. Wilson, Liang Fu, Vidya Madhavan

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Abstract

In topological crystalline insulators (TCIs), topology and crystal symmetry intertwine to create surface states with distinct characteristics. The breaking of crystal symmetry in TCIs is predicted to impart mass to the massless Dirac fermions. Here, we report high-resolution scanning tunneling microscopy studies of a TCI, Pb1-xSnxSe that reveal the coexistence of zero-mass Dirac fermions protected by crystal symmetry with massive Dirac fermions consistent with crystal symmetry breaking. In addition, we show two distinct regimes of the Fermi surface topology separated by a Van-Hove singularity at the Lifshitz transition point. Our work paves the way for engineering the Dirac band gap and realizing interaction-driven topological quantum phenomena in TCIs.

Original languageEnglish (US)
Pages (from-to)1496-1499
Number of pages4
JournalScience
Volume341
Issue number6153
DOIs
StatePublished - 2013

All Science Journal Classification (ASJC) codes

  • General

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    Okada, Y., Serbyn, M., Lin, H., Walkup, D., Zhou, W., Dhital, C., Neupane, M., Xu, S., Wang, Y. J., Sankar, R., Chou, F., Bansil, A., Hasan, M. Z., Wilson, S. D., Fu, L., & Madhavan, V. (2013). Observation of dirac node formation and mass acquisition in a topological crystalline insulator. Science, 341(6153), 1496-1499. https://doi.org/10.1126/science.1239451