title: Role of the Metal/Semiconductor interface in quantum size effects: Pb /Si(111)
abstract: Self-organized islands of uniform heights can form at low temperatures on metal/semiconductor systems as a result of quantum size effects, i.e., the occupation of discrete electron energy levels in the film. We compare the growth mode on two different substrates [Si(111)- (7x7) vs Si(111)- Pb(sqrt[3]xsqrt[3] )] with spot profile analysis low-energy electron diffraction. For the same growth conditions (of coverage and temperature) 7-step islands are the most stable islands on the (7x7) phase, while 5-step (but larger islands) are the most stable islands on the (sqrt[3]xsqrt[3] ). A theoretical calculation suggests that the height selection on the two interfaces can be attributed to the amount of charge transfer at the interface.
authors: Department of Physics, Iowa State University, Ames, Iowa and and Ames Laboratory, U.S.-DOE, Ames, Iowa 50011, USA.
authors: V
authors: Yeh
authors: L
authors: Berbil-Bautista
authors: CZ
authors: Wang
authors: KM
authors: Ho
authors: MC
authors: Tringides