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

Fedor Akhmetov*, Nikita Medvedev, Igor A. Makhotkin, Marcelo Ackermann, Igor Milov

*Corresponding author for this work

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Abstract

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.
Original languageEnglish
Article number5193
Number of pages12
JournalMaterials
Volume15
Issue number15
Early online date26 Jul 2022
DOIs
Publication statusPublished - 1 Aug 2022

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