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Nondegenerate metallic states on Bi(114): a one-dimensional Ttpological metal


Dil, J H; Meier, F; et al; Osterwalder, J (2009). Nondegenerate metallic states on Bi(114): a one-dimensional Ttpological metal. Physical Review Letters, 102 (9):096802.

Abstract

The (114) surface of the semimetal Bi is found to support a quasi-one-dimensional, metallic surface state. As required by symmetry, the state is degenerate along the Γ̅ -Y̅ line of the surface Brillouin zone with a highest binding energy of ≈150  meV. In the Γ̅ -X̅ direction the degeneracy is lifted by the strong spin-orbit splitting in Bi, as directly shown by spin-resolved photoemission. This results in a Fermi contour consisting of two closely separated, parallel lines of opposite spin direction. It is argued that similar states on related insulators would give rise to a one-dimensional quantum spin Hall effect.

Abstract

The (114) surface of the semimetal Bi is found to support a quasi-one-dimensional, metallic surface state. As required by symmetry, the state is degenerate along the Γ̅ -Y̅ line of the surface Brillouin zone with a highest binding energy of ≈150  meV. In the Γ̅ -X̅ direction the degeneracy is lifted by the strong spin-orbit splitting in Bi, as directly shown by spin-resolved photoemission. This results in a Fermi contour consisting of two closely separated, parallel lines of opposite spin direction. It is argued that similar states on related insulators would give rise to a one-dimensional quantum spin Hall effect.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2009
Deposited On:08 Jan 2010 15:52
Last Modified:05 Apr 2016 13:41
Publisher:American Physical Society
ISSN:0031-9007
Publisher DOI:https://doi.org/10.1103/PhysRevLett.102.096802

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