title: Nondegenerate metallic States on Bi(114): a one-dimensional topological metal.
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.
authors.affiliation: Institute for Storage Ring Facilities (ISA) and Interdisciplinary Nanoscience Center (iNANO), University of Aarhus, 8000 Aarhus C, Denmark.
authors.forename: J W
authors.initials: JW
authors.lastname: Wells
authors.forename: J H
authors.initials: JH
authors.lastname: Dil
authors.forename: F
authors.initials: F
authors.lastname: Meier
authors.forename: J
authors.initials: J
authors.lastname: Lobo-Checa
authors.forename: V N
authors.initials: VN
authors.lastname: Petrov
authors.forename: J
authors.initials: J
authors.lastname: Osterwalder
authors.forename: M M
authors.initials: MM
authors.lastname: Ugeda
authors.forename: I
authors.initials: I
authors.lastname: Fernandez-Torrente
authors.forename: J I
authors.initials: JI
authors.lastname: Pascual
authors.forename: E D L
authors.initials: ED
authors.lastname: Rienks
authors.forename: M F
authors.initials: MF
authors.lastname: Jensen
authors.forename: Ph
authors.initials: P
authors.lastname: Hofmann