title: Pseudogap mediated by quantum-size effects in lead islands.
abstract: Scanning tunneling spectroscopy measurements of Pb islands on Si(111) at high energy resolution reveal a novel pseudogap, or a pseudopeak in special cases, around the Fermi level in addition to the usual quantum well states. These gap or peak features persist to temperatures as high as approximately 80 K and are uniquely related to the quantum well nanostructure of the Pb islands. A systematic analysis indicates that electron-phonon scattering is responsible for the observed electronic structure.
authors.affiliation: Department of Physics, The Chinese University of Hong Kong, Hong Kong, China.
authors.forename: Kedong
authors.initials: K
authors.lastname: Wang
authors.forename: Xieqiu
authors.initials: X
authors.lastname: Zhang
authors.forename: M M T
authors.initials: MM
authors.lastname: Loy
authors.forename: T-C
authors.initials: TC
authors.lastname: Chiang
authors.forename: Xudong
authors.initials: X
authors.lastname: Xiao