Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 69: Ultrafast Electron and Spin Dynamics
O 69.8: Poster
Mittwoch, 18. März 2015, 18:15–21:00, Poster A
Influence of the density of states on nonequilibrium dynamics in metals — •Sebastian Weber1, Benedikt Y. Mueller2, and Baerbel Rethfeld1 — 1Technische Universität Kaiserslautern, Germany — 2Max-Planck-Institut für Intelligente Systeme, Germany
After excitation with an ultrashort laser pulse, the electrons in a metal are in a strong nonequilibrium state. During thermalization, they interact also with the lattice, transferring energy to the phonons. On the basis of complete Boltzmann-type collision integrals, a method allowing to treat materials with an arbitrary density of states has been developed [Phys. Rev. B 87, 035139 (2013)]. This method provides insights into the response of different material classes to ultrafast laser excitation. Note that this approach also opened the way to describe ultrafast magnetization dynamics, see [Phys. Rev. Lett. 111, 167204 (2013)].
Here, we study the microscopic relaxation processes, in particular thermalization and the electron-phonon coupling strength under nonequilibrium conditions. Results for gold [Appl. Surf. Sci. 302, 24 (2014)] are compared to those obtained for other metals like copper and silver.