Dresden 2006 – wissenschaftliches Programm

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O: Oberflächenphysik

O 42: Symposium Electron transfer processes II

O 42.1: Fachvortrag

Donnerstag, 30. März 2006, 15:00–15:30, WIL C207

Inter- and intraband scattering of electrons at surfaces — •Thomas Fauster — Lehrstuhl für Festkörperphysik, Universität Erlangen-Nürnberg, Staudtstr. 7, 91058 Erlangen

Time-resolved two-photon photoemission is the method of choice to study the electron dynamics at surfaces. With high energy and angular resolution various scattering processes (interband vs. intraband and inelastic vs. elastic) can be unraveled in detail. For image-potential states at Cu(001) surfaces it is shown [1], that adatoms induce mainly elastic scattering. Inelastic scattering processes are attributed to electron-electron scattering which is not significantly influenced by adatoms. The detailed study of scattering processes is particularly important to understand the electron dynamics at semiconductor surfaces [2].

[1] K. Boger, M. Weinelt, and Th. Fauster: Phys. Rev. Lett. 92, 126803 (2004); New J. Phys. 7, 110 (2005).

[2] M. Weinelt, M. Kutschera, Th. Fauster, and M. Rohlfing: Phys. Rev. Lett. 92, 126801 (2004).