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Effect of atomic‐temperature dependence of the electron–phonon coupling in two‐temperature model
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SYSNO ASEP 0560473 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Effect of atomic‐temperature dependence of the electron–phonon coupling in two‐temperature model Author(s) Akhmetov, F. (NL)
Medvedev, Nikita (FZU-D) ORCID, RID
Makhotkin, I. (NL)
Ackermann, M. (NL)
Milov, I. (NL)Number of authors 5 Article number 5193 Source Title Materials. - : MDPI
Roč. 15, č. 15 (2022)Number of pages 12 s. Language eng - English Country CH - Switzerland Keywords electron–phonon coupling ; two‐temperature model ; ultrafast laser irradiation of metals Subject RIV BH - Optics, Masers, Lasers OECD category Fluids and plasma physics (including surface physics) R&D Projects LTT17015 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) LM2018114 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Research Infrastructure e-INFRA CZ - 90140 - CESNET, zájmové sdružení právnických osob Method of publishing Open access Institutional support FZU-D - RVO:68378271 UT WOS 000838977300001 EID SCOPUS 85137147652 DOI 10.3390/ma15155193 Annotation 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. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2023 Electronic address https://hdl.handle.net/11104/0333397
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