Electron-phonon interaction and localization of surface-state carriers in a metallic monolayer.
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.
Matsuda
Iwao
I
Department of Physics, School of Science, The University of Tokyo, 7-3-1 Hongo, Tokyo, Japan. imatsuda@issp.u-tokyo.ac.jp
Liu
Canhua
C
Hirahara
Toru
T
Ueno
Masashi
M
Tanikawa
Takehiro
T
Kanagawa
Taizo
T
Hobara
Rei
R
Yamazaki
Shiro
S
Hasegawa
Shuji
S
Kobayashi
Katsuyoshi
K