title: One-dimensional metallic surface states of Pt-induced atomic nanowires on Ge(0 0 1).
abstract: Surface states of platinum-induced atomic nanowires on a germanium (0 0 1) surface, which shows a structural phase transition at 80 K, were studied by angle-resolved photoelectron spectroscopy (ARPES). We observed four one-dimensional metallic surface states, among which, two bands were reported in our previous study (Yaji et al 2013 Phys. Rev. B 87 241413). One of the newly-found two bands is a quasi-one-dimensional state and is split into two due to the Rashba effect. Photoelectron intensity from one of the spin-polarized branches is reduced at a boundary of the surface Brillouin zone below the phase transition temperature. The reduction of the photoelectron intensity in the low temperature phase is interpreted as the interference of photoelectrons, not as the Peierls instability. We also discuss the low energy properties of the metallic surface states and their spin splitting using high-resolution ARPES with a vacuum ultraviolet laser.
authors.affiliation: Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan.
authors.forename: Koichiro
authors.initials: K
authors.lastname: Yaji
authors.forename: Sunghun
authors.initials: S
authors.lastname: Kim
authors.forename: Izumi
authors.initials: I
authors.lastname: Mochizuki
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Takeichi
authors.forename: Yoshiyuki
authors.initials: Y
authors.lastname: Ohtsubo
authors.forename: Patrick
authors.initials: P
authors.lastname: Le Fèvre
authors.forename: François
authors.initials: F
authors.lastname: Bertran
authors.forename: Amina
authors.initials: A
authors.lastname: Taleb-Ibrahimi
authors.forename: Shik
authors.initials: S
authors.lastname: Shin
authors.forename: Fumio
authors.initials: F
authors.lastname: Komori