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