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O: Fachverband Oberflächenphysik

O 23: Poster Ultrafast Electron Dynamics

O 23.18: Poster

Montag, 17. März 2025, 18:00–20:00, P2

Band-resolved studies of laser-induced ultrafast dynamics in gold — •Stephanie Roden, Tobias Held, Sebastian T. Weber, and Baerbel Rethfeld — Department of Physics and Research Center OPTIMAS, RPTU in Kaiserslautern

The irradiation of a metal with a short-pulsed optical laser leads to the excitation of electrons, which absorb energy in accordance with their orbital characteristics. To analyze the resulting state of thermodynamic non-equilibrium, the thermalization of the excited electrons and relaxation processes with the phonon system to a joint temperature can be calculated in a kinetic manner by coupled Boltzmann collision integrals.

In this work we extend our existing energy-resolved model based on one effective band for the electrons [1] to a two-band model for a thin metal film that distinguishes between the free sp- and more localized d-electrons [2]. By considering the different electron bands separately, we can investigate the influence of intra- and interband relaxation in the electron system on the dynamics of the entire sample. We are focusing especially on the effect on the band occupation and the coupling strengths between the electron systems and the phonons.

[1] B. Y. Mueller and B. Rethfeld, PRB 87, 035139 (2013)

[2] T. Held, S. T. Weber, and B. Rethfeld, Journal of Physics: Condensed Matter (2025)

Keywords: Ultrashort laser excitation; Boltzmann equation; electron-phonon coupling