SurfaceScience21 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 79: Poster Session VI: Ultrafast electron dynamics at surface and interfaces II

O 79.5: Poster

Mittwoch, 3. März 2021, 13:30–15:30, P

Extension of the two-temperature model capturing nonequilibrium electrons after ultrashort laser excitation — •Markus Uehlein, Sebastian T. Weber, and Baerbel Rethfeld — Department of Physics and Research Center OPTIMAS, TU Kaiserslautern, Erwin-Schroedinger-Strasse 46, 67663 Kaiserslautern, Germany

The understanding of materials’ reaction on a laser excitation with pulse durations below one picosecond is of significant importance for industrial applications. The energy of ultrashort laser pulses in the visible range is absorbed by the electrons. This creates a non-equilibrium in the electron system that thermalizes typically in the following hundreds of femtoseconds [1]. On longer time scales, electrons and phonons relax to a joint temperature. The latter relaxation process is described by the well-known two-temperature model (TTM) [2]. However, this neglects the electronic non-equilibrium completely.
In this presentation, we investigate an extension of the TTM developed by Carpene [3] and Tsibidis [4]. This extension adds a system of nonthermal electrons to the TTM. We introduce several improvements and discuss selected results of the extended two-temperature model.
[1] B. Y. Mueller and B. Rethfeld, PRB 87, 035139 (2013)
[2] S. I. Anisimov et al., JETP 39, 375 (1974)
[3] E. Carpene, PRB 74, 024301 (2006)
[4] G. D. Tsibidis, Appl. Phys. A 124, 311 (2018)