Berlin 2005 – wissenschaftliches Programm
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O: Oberflächenphysik
O 36: Postersitzung (Elektronische Struktur, Grenzfl
äche fest-flüssig, Halbleiteroberfl
ächen und -grenzfl
ächen, Nanostrukturen, Oberfl
ächenreaktionen, Teilchen und Cluster, Struktur und Dynamik reiner Oberfl
ächen)
O 36.13: Poster
Montag, 7. März 2005, 15:00–18:00, Poster TU F
Subsurface impurities in noble metals - a comparison between STM data and simulations of bulk electron transport — •A. Weismann, M. Wenderoth, N. Quaas, and R. G. Ulbrich — IV. Physikalisches Institut der Universität Göttingen,Friedrich-Hund-Platz 1, 37077 Göttingen
Isolated sub-surface impurities a few monolayers below the (111) surface of noble metals were prepared by codeposition of host metal and impurity compound from two evaporators and investigated with Scanning Tunneling Microscopy at 8 K. The modulations of the surface electronic density in the vicinity of the the defects show signatures of bulk electron properties, i.e. a threefold symmetry and oscillation lengths much shorter than the wavelength λF of the surface state. Simulations of bulk electron scattering at point defects based on the host metal band-structure were performed. These calculations are in good agreement with the obtained STM data. The surface patterns are strongly influenced by electron focussing effects due to the non-spherical fermi surface of the host metal.