title: Band structure and oscillatory electron-phonon coupling of Pb thin films determined by atomic-layer-resolved quantum-well states.
abstract: Using a low temperature growth method, we have prepared atomically flat Pb thin films over a wide range of film thickness on a Si-(111)-7 x 7 surface. The Pb film morphology and electronic structure are investigated in situ by scanning tunneling microscopy and angle-resolved photoemission spectroscopy. Well-defined and atomic-layer-resolved quantum-well states of the Pb films are used to determine the band structure and the electron-phonon coupling constant (lambda) of the films. We found an oscillatory behavior of lambda with an oscillation periodicity of two atomic layers. Almost all essential features in the Pb/Si(111) system, such as the growth mode, the oscillatory film stability, and the 9 monolayer envelope beating pattern, can be explained by our results in terms of the electron confinement in Pb films.
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, The Chinese Academy of Sciences, Beijing 100080, China.
authors.forename: Yan-Feng
authors.initials: YF
authors.lastname: Zhang
authors.forename: Jin-Feng
authors.initials: JF
authors.lastname: Jia
authors.forename: Tie-Zhu
authors.initials: TZ
authors.lastname: Han
authors.forename: Zhe
authors.initials: Z
authors.lastname: Tang
authors.forename: Quan-Tong
authors.initials: QT
authors.lastname: Shen
authors.forename: Yang
authors.initials: Y
authors.lastname: Guo
authors.forename: Z Q
authors.initials: ZQ
authors.lastname: Qiu
authors.forename: Qi-Kun
authors.initials: QK
authors.lastname: Xue