title: Experimental evidence for spin-split bands in a one-dimensional chain structure.
abstract: Gold atom chains on vicinal Si(111) surfaces exhibit an unusual doublet of half-filled bands, whose origin has remained uncertain. The splitting is identified by angle-resolved photoemission as a spin splitting induced by the spin-orbit interaction (Rashba effect), in agreement with a theoretical prediction by Sánchez-Portal, Riikonen, and Martin. This interaction leads to a characteristic pattern of avoided band crossings at a superlattice zone boundary. Two out of four crossings are avoided, with a minigap E_{G}=85 meV and a k offset of 0.05 A;{-1}.
authors.affiliation: Department of Physics, University of Wisconsin Madison, 1150 University Ave., Madison, Wisconsin 53706, USA.
authors.forename: I
authors.initials: I
authors.lastname: Barke
authors.forename: Fan
authors.initials: F
authors.lastname: Zheng
authors.forename: T K
authors.initials: TK
authors.lastname: Rügheimer
authors.forename: F J
authors.initials: FJ
authors.lastname: Himpsel