Effect of Atomic-Temperature Dependence of the Electron–Phonon Coupling in Two-Temperature Model

0571799 - ÚFP 2024 RIV CH eng J - Journal Article
Akhmetov, F. - Medvedev, Nikita - Makhotkin, I. - Ackermann, M. - Milov, I.
Effect of Atomic-Temperature Dependence of the Electron–Phonon Coupling in Two-Temperature Model.
Materials. Roč. 15, č. 15 (2022), č. článku 5193. E-ISSN 1996-1944
R&D Projects: GA MŠMT(CZ) LM2018114; GA MŠMT LTT17015; GA MŠMT EF16_013/0001552
Institutional support: RVO:61389021
Keywords : electron–phonon coupling * two-temperature model
OECD category: Fluids and plasma physics (including surface physics)
Impact factor: 3.4, year: 2022
Method of publishing: Open access
https://www.mdpi.com/1996-1944/15/15/5193

Ultrafast laser irradiation of metals can often be described theoretically with the two-temperature model. The energy exchange between the excited electronic system and the atomic one is governed by the electron–phonon coupling parameter. The electron–phonon coupling depends on both, the electronic and the atomic temperature. We analyze the effect of the dependence of the electron–phonon coupling parameter on the atomic temperature in ruthenium, gold, and palladium. It is shown that the dependence on the atomic temperature induces nonlinear behavior, in which a higher initial electronic temperature leads to faster electron–phonon equilibration. Analysis of the experimental measurements of the transient thermoreflectance of the laser-irradiated ruthenium thin film allows us to draw some, albeit indirect, conclusions about the limits of the applicability of the different coupling parametrizations.
Permanent Link: https://hdl.handle.net/11104/0342701