title: Local vibrational excitation through extended electronic states at a germanium surface.
abstract: Atomic motion through excitation of extended surface electronic states on Ge(001) is studied using extraction of electrons by scanning tunneling microscopy and density functional theory. Single-electron excitation into the surface states nonlocally alters the tilting orientation of the surface Ge dimer, and the change rate depends on the excitation energy. Theoretical investigations identify the excited electronic states for the dimer motion, and clarify the strong coupling between the surface state electrons and a local vibrational mode of the dimer for changing the tilting orientation.
authors.affiliation: Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan.
authors.forename: Kota
authors.initials: K
authors.lastname: Tomatsu
authors.forename: Kan
authors.initials: K
authors.lastname: Nakatsuji
authors.forename: Masamichi
authors.initials: M
authors.lastname: Yamada
authors.forename: Fumio
authors.initials: F
authors.lastname: Komori
authors.forename: Binghai
authors.initials: B
authors.lastname: Yan
authors.forename: Chiyung
authors.initials: C
authors.lastname: Yam
authors.forename: Thomas
authors.initials: T
authors.lastname: Frauenheim
authors.forename: Yong
authors.initials: Y
authors.lastname: Xu
authors.forename: Wenhui
authors.initials: W
authors.lastname: Duan