SKM 2023 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 8: Ultrafast Electron Dynamics at Surface and Interfaces I

O 8.4: Vortrag

Montag, 27. März 2023, 11:15–11:30, TRE Phy

Capturing non-thermal electrons: To what extend can a temperature-based model compete with a kinetic description? — •Markus Uehlein, Sebastian T. Weber, and Baerbel Rethfeld — Department of Physics and Research Center OPTIMAS, RPTU, Kaiserslautern, Germany

The development and usage of laser systems in research allows to study the dynamics of laser-excited electrons in metals on sub-picosecond timescales. Kinetic models can trace non-equilibrium distributions in great detail for instance by using full Boltzmann collision integrals [1]. Due to the excitation of non-thermal electrons, this dynamics cannot be described with purely temperature-based models. However, there are a number of extensions of the well known two-temperature model to trace the non-thermal electrons in a numerically simplified way.
We aim to clarify, whether an extended TTM (first published in Refs. [2, 3], improved in Ref. [4]) can describe this electronic non-equilibrium dynamics by comparing it to the kinetic description. In particular, we compare the spectral particle dynamics to a time-resolved two-photon photoemission measurement [5].

[1] B. Y. Mueller and B. Rethfeld; Phys. Rev. B 87, 035139 (2013)
[2] E. Carpene; Phys. Rev. B 74, 024301 (2006)
[3] G. D. Tsibidis; Appl. Phys. A 124, 311 (2018)
[4] M. Uehlein, S. T. Weber and B. Rethfeld;
[4] Nanomaterials 12, 1655 (2022)
[5] Y. Beyazit et al.; Phys. Rev. Lett. 125, 076803 (2020)