Pseudogap mediated by quantum-size effects in lead islands.
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.
Wang
Kedong
K
Department of Physics, The Chinese University of Hong Kong, Hong Kong, China.
Zhang
Xieqiu
X
Loy
M M T
MM
Chiang
T-C
TC
Xiao
Xudong
X