Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 88: Electronic structure II

O 88.9: Vortrag

Freitag, 30. März 2012, 12:30–12:45, MA 043

Localized Doping on an Atomic Chain System — •I. Barke, S. Polei, V. v. Oeynhausen, and K.-H. Meiwes-Broer — Instuitut für Physik, Universität Rostock, 18051 Rostock, Germany

Adatoms can be used as efficient dopants for band-structure engineering of surfaces. While delocalized electron waves in two or three dimensions are usually affected by an ensemble of impurities, perfect separation of segments between two dopants can be achieved in one dimension. This results in local regions of well-defined charge-carrier concentrations. On the quasi one-dimensional system Si(111)5x2-Au it is shown that quantum wires between two doping adatoms establish a local electronic structure depending on the respective adatom distance. Within a chain segment the effect of a spatially independent charge-carrier concentration is superimposed by a Coulomb-like interaction with the positively charged impurities. This offers a natural explanation for the relatively broad features observed in photoemission [1] and the complex appearance in STM and STS images [2].

[1] J. L. McChesney et al., 70, 195430 (2004).

[2] I. Barke et al., Solid State Commun. 142, 617 (2007).