SurfaceScience21 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 92: Poster Session VII: Ultrafast electron dynamics at surface and interfaces III

O 92.5: Poster

Donnerstag, 4. März 2021, 10:30–12:30, P

Electron Thermalization in laser-excited Graphite — •Katharina Hilgert, Sebastian T Weber, and Baerbel Rethfeld — Department of Physics and Research Center OPTIMAS, TU Kaiserslautern, Erwin-Schroedinger- Strasse 46, 67663 Kaiserslautern, Germany

In this contribution we present a theoretical calculation of electron thermalization in a laser-excited graphite sample. Our calculations are motivated by an experimental paper applying trARPES, which concludes that the electron gas has reached a Fermi-Dirac distributed state only 50 fs after the excitation [1]. We have recreated these observations using a simulation based on full Boltzmann collision integrals [2] and were able to achieve comparable results. We then extended our examination by using two alternative analyzation methods utilizing the energy density of non-equilibrium electrons and the temporal evolution of the entropy, respectively. We have found that the method proposed in the experimental paper slightly underestimates the relaxation time but overall predicts results in an accurate order of magnitude.

[1] G. Rohde et al., PRL 121, 256401 (2018)
[2] B.Y. Mueller and B. Rethfeld, PRB 87, 035139 (2013)