Berlin 2024 – scientific programme
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O: Fachverband Oberflächenphysik
O 36: Poster: Ultrafast Electron Dynamics at Surfaces and Interfaces
O 36.11: Poster
Tuesday, March 19, 2024, 18:00–20:00, Poster C
Nonequilibrium optical properties in laser-excited noble metals — •Pascal D. Ndione1, Tobias Held1, Sebastian T. Weber1, Dirk O. Gericke2, and Baerbel Rethfeld1 — 1Department of Physics and Research Center OPTIMAS, RPTU Kaiserslautern-Landau — 2CFSA, Department of Physics, University of Warwick
We study the electron density and optical responses in gold following excitation with XUV and visible light. We develop multiband rate equations that track the density response in each active electron band [1]. The rate equations also trace the energy content of the sp- and d-electrons and couple them to the phonons. Moreover, we use a modified Drude-Lorentz approach to calculate the transient dielectric function [2]. Our results show that visible light excitation leads to an overpopulation of the sp-band, primarily driven by photo-excitation, while XUV irradiation results in an underpopulation of the sp-band, dominated by subsequent impact ionization. Comparison of our simulation for the optical response with pump-probe experiments [1, 3] shows excellent agreement, suggesting a strongly improved understanding of the relevant physical processes and their timescales.
References:
[1] P.D. Ndione et al., Sci. Rep., 12, 4693 (2022)
[2] P.D. Ndione et al., ArXiv, 2307.11874 (2023)
[3] Z. Chen et al., Nat. Commun., 12, 1638 (2021)