Dresden 2006 – wissenschaftliches Programm
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O: Oberflächenphysik
O 41: Electronic structure III
O 41.8: Vortrag
Donnerstag, 30. März 2006, 16:45–17:00, WIL B321
Unusual temperature dependence of the surface state lifetime on Al(001) — •M. F. Jensen1, T. K. Kim1, S. Bengiò1, Ph. Hofmann1, I. Yu. Sklyadneva2, A. Leonardo2, and E. V. Chulkov2 — 1Institute for Storage Ring Facilities and iNano Center, University of Aarhus, 8000 Aarhus C, Denmark — 2Donostia International Physics Center (DIPC), 20018 San Sebastián / Donostia, Basque Country, Spain
The influence of many-body effects on surface state lifetimes, and in particular the role of the electron-phonon coupling, has recently attracted considerable attention. For temperatures higher than the surface Debye temperature, the situation is expected to be very simple: The inverse surface state lifetime depends linearly on the temperature with the slope mainly given by the electron-phonon mass enhancement parameter λ. Here we present results for the surface state on Al(001) which turns out to behave differently: for high temperatures a stronger than linear increase of the inverse lifetime is observed. The experimental results are compared to first-principles calculations and possible reasons for the unexpected temperature dependence are discussed.