Regensburg 2004 – scientific programme

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O: Oberflächenphysik

O 17: Elektronische Struktur (Experiment und Theorie) II

O 17.6: Talk

Tuesday, March 9, 2004, 12:30–12:45, H36

Confinement and quantization of the Ag(111) surface state in hexagonal vacancy islands — •Henning Jensen, Jörg Kröger, and Richard Berndt — Institut für Experimentelle und Angewandte Physik, Universität Kiel, D-24098 Kiel, Germany

The Shockley surface state of the noble metal (111) faces provides an experimentally accessible model system for a two-dimensional free electron gas. We report on the scattering and confinement of the Ag(111) surface state by hexagonal sputtering-induced surface defects of monatomic depth. Low-temperature STS measurements of the local density of states inside these defects reveal a series of resonance peaks, which are compared with potential well calculations and related experimental results. Examination of the line width vs. binding energy relation provides an estimate of surface state electron life time.