Surface states on a topologically nontrivial semimetal: The case of Sb(110)

Article

关键词: SINGLE DIRAC CONE;    ELECTRONIC-STRUCTURE;    INSULATOR;    BI2TE3;   

DOI  :  10.1103/PhysRevB.85.155431

来源: SCIE

【 摘 要 】

The electronic structure of Sb(110) is studied by angle-resolved photoemission spectroscopy and first-principles calculations, revealing several electronic surface states in the projected bulk band gaps around the Fermi energy. The dispersion of the states can be interpreted in terms of a strong spin-orbit splitting. The bulk band structure of Sb has the characteristics of a strong topological insulator with a Z(2) invariant v(0) = 1. This puts constraints on the existence of metallic surface states and the expected topology of the surface Fermi contour. However, bulk Sb is a semimetal, not an insulator, and these constraints are therefore partly relaxed. This relation of bulk topology and expected surface-state dispersion for semimetals is discussed.

【 授权许可】

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