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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 36.55: Poster

Montag, 7. März 2005, 15:00–18:00, Poster TU F

Electronic lifetime in quantum corrals — •Matthias Semmelhack and Felix von Oppen — Fachbereich Physik, FU Berlin, Arnimallee 14, D-14195 Berlin

Motivated by experiment [1], we study the electronic lifetime in quantum corrals on noble metal surfaces. We show that the dominant contribution to the lifetime of surface electrons arises from the excitation of surface electron-hole pairs. Using diagrammatic many-body theory combined with Monte Carlo methods, we find that the lifetime as a function of excitation energy exhibits oscillations induced by the quantum corral. We also develop an efficient semiclassical approximation of the free Green function of the corral, which may be helpful in studying further interaction effects in quantum corrals.

[1] K.-F. Braun, K.-H. Rieder, Phys. Rev. Lett. 88, 096801 (2002)