Nondegenerate metallic States on Bi(114): a one-dimensional topological metal.
Phys Rev Lett
; 102(9): 096802, 2009 Mar 06.
Article
em En
| MEDLINE
| ID: mdl-19392548
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 Gamma-Y line of the surface Brillouin zone with a highest binding energy of approximately 150 meV. In the Gamma-X 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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MEDLINE
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En
Ano de publicação:
2009
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Article