title: Electron-phonon interaction and localization of surface-state carriers in a metallic monolayer.
abstract: Temperature-dependent electron transport in a metallic surface superstructure, Si(111)sqrt[3] x sqrt[3]-Ag, was studied by a micro-four-point probe method and photoemission spectroscopy. The surface-state conductivity exhibits a sharp transition from metallic conduction to strong localization at approximately 150 K. The metallic regime is due to electron-phonon interaction while the localization seemingly originates from coherency of electron waves. Random potential variations, caused by Friedel oscillations of surface electrons around defects, likely induce strong carrier localization.
authors.affiliation: Department of Physics, School of Science, The University of Tokyo, 7-3-1 Hongo, Tokyo, Japan. imatsuda@issp.u-tokyo.ac.jp
authors.forename: Iwao
authors.initials: I
authors.lastname: Matsuda
authors.forename: Canhua
authors.initials: C
authors.lastname: Liu
authors.forename: Toru
authors.initials: T
authors.lastname: Hirahara
authors.forename: Masashi
authors.initials: M
authors.lastname: Ueno
authors.forename: Takehiro
authors.initials: T
authors.lastname: Tanikawa
authors.forename: Taizo
authors.initials: T
authors.lastname: Kanagawa
authors.forename: Rei
authors.initials: R
authors.lastname: Hobara
authors.forename: Shiro
authors.initials: S
authors.lastname: Yamazaki
authors.forename: Shuji
authors.initials: S
authors.lastname: Hasegawa
authors.forename: Katsuyoshi
authors.initials: K
authors.lastname: Kobayashi