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O: Oberflächenphysik

O 41: Electronic structure III

O 41.1: Vortrag

Donnerstag, 30. März 2006, 15:00–15:15, WIL B321

Focusing effect on surfaces due to scattering of bulk electrons at subsurface impurities — •Samir Lounis, Phivos Mavropoulos, Peter H. Dederichs, and Stefan Blügel — Institut für Festkörperforschung, Forschungszentrum Jülich, D-52425 Jülich, Germany

An impurity placed below the surface of a noble metal acts as a scatterer of bulk electrons which can lead to short wavelength patterns at the surface as recently found in STM experiments [1]. As explained by these authors the scattering intensity is focused in special directions being determined by regions of low curvature on the Fermi surface. Motivated by this, we carried out a systematic theoretical investigation on the scattering effect of a Co impurity burried at different positions below the (001), (110) and (111) surfaces of noble metals. The wavelength patterns which are related to the curvature of the Fermi surface of the host have different shapes depending on the orientation of the surface. In addition we discuss typical anomalies arizing from the reflection of the scattered waves at burried interfaces. The calculations were performed using the full-potential scalar–relativistic Korringa-Kohn-Rostoker Green–function method within Density Functional Theory.

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

[1] A. Weismann, M. Wenderoth, N. Quaas, and R. G. Ulbrich, Verhandlungen der Deutschen Physikalischen Gesellschaft, O 36.13, 502 (2005) (unpublished).