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

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 spi...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2012-04, Vol.85 (15), Article 155431
Main Authors: Bianchi, Marco, Guan, Dandan, Stróżecka, Anna, Voetmann, Celia H., Bao, Shining, Pascual, Jose Ignacio, Eiguren, Asier, Hofmann, Philip
Format: Article
Language:English
Subjects:
Antimony
Condensed matter
Dispersions
Energy gaps (solid state)
Fermi surfaces
Insulators
Metalloids
Topology
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Summary: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 sub(2) invariant [nu] sub(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.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.85.155431