title: Scanning-tunneling spectroscopy of surface-state electrons scattered by a slightly disordered two-dimensional dilute "solid": Ce on Ag(111).
abstract: Low temperature (3.9 K) scanning-tunneling spectroscopy on a hexagonal superlattice of Ce adatoms on Ag(111) reveals site-dependent characteristic features in differential conductance spectra and in spectroscopic images at atomic-scale spatial resolution. Using a tight-binding model, we relate the overall spectral structures to the scattering of Ag(111) surface-state electrons by the Ce adatoms, the site dependence to the disorder induced by imperfections of the superlattice, and the opening of a gap in the local density of states to the observed stabilization of superlattices with adatom distances in the range of 2.3-3.5 nm.
authors.affiliation: Institut de Physique des Nanostructures, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland. Markus.Ternes@epfl.ch
authors.forename: Markus
authors.initials: M
authors.lastname: Ternes
authors.forename: Cédric
authors.initials: C
authors.lastname: Weber
authors.forename: Marina
authors.initials: M
authors.lastname: Pivetta
authors.forename: François
authors.initials: F
authors.lastname: Patthey
authors.forename: Jonathan P
authors.initials: JP
authors.lastname: Pelz
authors.forename: Thierry
authors.initials: T
authors.lastname: Giamarchi
authors.forename: Frédéric
authors.initials: F
authors.lastname: Mila
authors.forename: Wolf-Dieter
authors.initials: WD
authors.lastname: Schneider