Observation of topological crystalline insulator surface states on (111)-oriented Pb${}_{1-x}$Sn${}_x$Se films

Abstract

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.

5 pages, 4 figures

References in corpus (4)

• A topological Dirac insulator in a quantum spin Hall phase : Experimental observation of first strong topological insulator
• Topological Crystalline Insulators
• Two types of Dirac-cone surface states on (111) surface of topological crystalline insulator SnTe
• Spin-polarized (001) surface states of the topological crystalline insulator Pb_{0.73}Sn_{0.27}Se

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