title: Confined doping on a metallic atomic chain structure.
abstract: On Si(111)-(5×2)-Au it is shown that metallic sections of quantum wires between two doping adatoms establish a local electronic structure which is primarily defined by the section length. Such confined doping is a direct consequence of reduced dimensionality and is not observed in higher dimensions. Within a chain segment, the effect of a spatially independent charge-carrier concentration is superimposed by a Coulomb-like interaction due to the positively charged dopants. This offers a natural explanation for the relatively broad photoemission features and the complex appearance in scanning tunneling microscopy and spectroscopy images.
authors.affiliation: Department of Physics, University of Rostock, D-18051 Rostock, Germany.
authors.forename: I
authors.initials: I
authors.lastname: Barke
authors.forename: S
authors.initials: S
authors.lastname: Polei
authors.forename: V
authors.initials: V
authors.lastname: v Oeynhausen
authors.forename: K-H
authors.initials: KH
authors.lastname: Meiwes-Broer