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Berlin 2005 – scientific programme

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O: Oberflächenphysik

O 52: Elektronische Struktur IV

O 52.4: Talk

Wednesday, March 9, 2005, 11:30–11:45, TU EB301

Electron dynamics in vacancy islands — •J. Kröger1, H. Jensen1, R. Berndt1, and S. Crampin21Institut für Experimentelle und Angewandte Physik, Universität Kiel, D-24098 Kiel, Germany — 2Department of Physics, University of Bath, Bath BA2 7AY, United Kingdom

The dynamics of Ag(111) surface state electrons confined to nanoscale hexagonal and triangular vacancy islands are investigated using scanning tunneling spectroscopy. The lifetimes of quantised states with significant amplitude near the centers of the vacancies are weakly affected by the geometry of the confining cavity. A model that includes the dependence of the lifetime on electron energy, vacancy size, step reflectivity and the phase coherence length describes the results well. For vacancy islands with areas in the range ≈ 40–220 nm2 lossy scattering is the dominant lifetime-limiting process. This result and a corrected analysis of published experimental data improve the consistency of experimental and calculated surface state lifetimes.

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