Observation of topological crystalline insulator surface states on (111)-oriented Pb 1-x Sn x Se films

  • Polley C
  • Dziawa P
  • Reszka A
 et al. 
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We present angle resolved photoemission spectroscopy measurements of the surface states on in-situ grown (111) oriented films of Pb$_{1-x}$Sn$_{x}$Se, a three dimensional topological crystalline insulator. We observe surface states with Dirac-like dispersion at $\bar{\Gamma}$ and $\bar{M}$ in the surface Brillouin zone, supporting recent theoretical predictions for this family of materials. We study the parallel dispersion isotropy and Dirac-point binding energy of the surface states, and perform tight-binding calculations to support our findings. The relative simplicity of the growth technique is encouraging, and suggests a clear path for future investigations into the role of strain, vicinality and alternative surface orientations in (Pb,Sn)Se compounds.

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  • C. M. Polley

  • P. Dziawa

  • A. Reszka

  • A. Szczerbakow

  • R. Minikayev

  • J. Z. Domagala

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