Berlin 2005 – scientific programme

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O: Oberflächenphysik

O 21: Elektronische Struktur II

O 21.2: Talk

Saturday, March 5, 2005, 11:00–11:15, TU EB107

Surface state scattering by atomic–scale clusters on noble metals — •S. Lounis, Ph. Mavropoulos, S. Blügel, and P. H. Dederichs — Institut für Festkörperforschung, Forschungszentrum Jülich, D-52425 Jülich, Germany

When surface state electrons scatter at perturbations, such as magnetic or nonmagnetic adatoms or clusters on surfaces, an electronic resonance can develop at the bottom of the surface state band for both spin channels. In the case of adatoms, these states have been found very recently in scanning tunneling spectroscopy experiments of the group of R. Berndt (University of Kiel). Motivated by these experiments, we carried out a systematic theoretical investigation of the electronic structure of these surface states in the presence of magnetic and non-magnetic 3d atoms on Cu(111) and Ag(111) surfaces. The calculations are performed using the full-potential scalar–relativistic Korringa-Kohn-Rostoker Green–function method extended to treat noncollinear magnetic nanostructures on surfaces.

We extended this investigation to dimers and trimers, and investigate how the resonance state depends on cluster size and complexity of the magnetic configuration.

–Work supported by the DFG Schwerpunktsprogramm “Clusters on Surfaces” (SPP 1153).