Dresden 2011 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 85: Electron and spin dynamics I

O 85.1: Vortrag

Donnerstag, 17. März 2011, 16:30–16:45, WIL A317

Electron-phonon coupling in laser excited metals — •Isabel Klett, Benedikt Müller, and Bärbel Rethfeld — TU Kaiserslautern, Germany

Irradiation of metals with an ultrashort laser pulse leads to a hot electron gas while the lattice stays cold. The corresponding electron-phonon coupling has been calculated using a thermalized Fermi distribution function [1]. However, after laser excitation, the electrons cannot be assumed in equilibrium, due to their relaxation time of tens of femtoseconds. In order to allow a nonequilibrium distribution function, the Boltzmann equation is applied [2]. This model is extended by implementing the density of states of real metals into the Boltzmann collision terms. From the solution we extract the electron-phonon coupling in thermal nonequilibrium.

Z. Lin, L. Zhigilei and V. Celli in Phys.Rev.B 77, 075133 (2008)
B. Rethfeld, A. Kaiser, M. Vicanek and G. Simon in Phys.Rev.B 65, 214303 (2002)