Two types of Dirac-cone surface states on (111) surface of topological crystalline insulator SnTe

Abstract

We have performed angle-resolved photoemission spectroscopy (ARPES) on the (111) surface of the topological crystalline insulator SnTe. Distinct from a pair of Dirac-cone surface states across the X_bar point of the surface Brillouin zone on the (001) surface, we revealed two types of Dirac-cone surface states each centered at the G_bar and M_bar points, which originate from the bulk-band inversion at the L points. We also found that the energy location of the Dirac point and the Dirac velocity are different from each other. This ARPES experiment demonstrates the surface states on different crystal faces of a topological material, and it elucidates how mirror-symmetry-protected Dirac cones of a topological crystalline insulator show up on surfaces with different symmetries.

6 pages, 5 figures

References in corpus (5)

• Classification of topological insulators and superconductors in three spatial dimensions
• Topological Crystalline Insulators
• Antiferromagnetic topological insulators
• Spin-polarized (001) surface states of the topological crystalline insulator Pb_{0.73}Sn_{0.27}Se
• Surface states on a topologically non-trivial semimetal: The case of Sb(110)

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