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

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Abstract

We present angle-resolved photoemission spectroscopy measurements of the surface states on in-situ grown (111) oriented films of Pb1-xSnxSe, a three-dimensional topological crystalline insulator. We observe surface states with Dirac-like dispersion at Γ̄ and M̄ 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 solid solutions. © 2014 American Physical Society.

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Polley, C. M., Dziawa, P., Reszka, A., Szczerbakow, A., Minikayev, R., Domagala, J. Z., … Balasubramanian, T. (2014). Observation of topological crystalline insulator surface states on (111)-oriented Pb 1-x Sn x Se films. Physical Review B - Condensed Matter and Materials Physics, 89(7). https://doi.org/10.1103/PhysRevB.89.075317

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