Berlin 2005 – scientific programme

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O: Oberflächenphysik

O 21: Elektronische Struktur II

O 21.9: Talk

Saturday, March 5, 2005, 12:45–13:00, TU EB107

Surface-state localization at adatoms — •R. Berndt, J. Kröger, L. Limot, and E. Pehlke — Institut für Experimentelle und Angewandte Physik, Institut für Theoretische und Astrophysik, Christian-Albrechts-Universität zu Kiel, D-24098 Kiel

Low-temperature scanning tunneling spectroscopy of magnetic and non-magnetic metal atoms on Ag(111) and on Cu(111) surfaces reveals the existence of a common electronic resonance at an energy below the binding energies of the surface states. Using an extended Newns-Anderson model, we assign this resonance to an adsorbate-induced bound state, split off from the bottom of the surface-state band, and broadened by the interaction with bulk states. A lineshape analysis of the bound state indicates that native adatoms decrease the surface-state lifetime, while a cobalt adatom causes no significant change.