Implementation of the electronic non-equilibrium in the two-temperature model
Abstract
We investigate a temperature-based model, called extended two-temperature model (eTTM), that describes the electronic non-equilibrium and its effect on energy dissipation in metals after ultrashort laser excitation. We derive and discuss improvements in comparison to published versions of this model [E. Carpene, Phys. Rev. B 2006, 74, 024301; G. Tsibidis, Appl. Phys. A 2018, 124, 311]. The comparison of the results of the eTTM with results of the well-known two-temperature model (TTM) shows a delayed increase of the electronic temperature when being calculated with the eTTM. We find a good agreement in the non-equilibrium energy distribution after absorption of photons with results from a kinetic description using a Boltzmann collision term. The model provides a convenient tool for fast calculation of features of the non-equilibrium electrons. As an example we inspect the dynamics of high-energy electrons observable in photo-electron spectroscopy and demonstrate the advantage of the eTTM over the conventional two-temperature model.
Cite
@article{arxiv.2112.01851,
title = {Implementation of the electronic non-equilibrium in the two-temperature model},
author = {Markus Uehlein and Sebastian T. Weber and Baerbel Rethfeld},
journal= {arXiv preprint arXiv:2112.01851},
year = {2023}
}
Comments
14 pages, 8 figures (including 3 double figures)