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Electronic nonequilibrium effect in ultrafast-laser-irradiated solids
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SYSNO ASEP 0585129 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Electronic nonequilibrium effect in ultrafast-laser-irradiated solids Author(s) Medvedev, Nikita (FZU-D) ORCID, RID Number of authors 1 Article number 015934 Source Title Physica Scripta. - : Institute of Physics Publishing - ISSN 0031-8949
Roč. 99, č. 1 (2024)Number of pages 23 s. Language eng - English Country US - United States Keywords hybrid model ; multiscale model ; Monte Carlo ; Boltzmann equation ; tight binding ; molecular dynamics ; noneuqilibrium kinetics Subject RIV BH - Optics, Masers, Lasers OECD category Optics (including laser optics and quantum optics) R&D Projects LTT17015 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) LM2023068 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) EF18_053/0016627 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 001128694700001 EID SCOPUS 85180528349 DOI 10.1088/1402-4896/ad13df Annotation This paper describes the effects of electronic nonequilibrium in a simulation of ultrafast laser irradiation of materials. The simulation scheme based on tight-binding molecular dynamics, in which the electronic populations are traced with a combined Monte Carlo and Boltzmann equation, enables the modeling of nonequilibrium, nonthermal, and nonadiabatic (electron-phonon coupling) effects simultaneously. The electron-electron thermalization is described within the relaxation-time approximation, which automatically restores various known limits such as instantaneous thermaliza tion (the thermalization time and Born-Oppenheimer(BO) approximation. The results of the simulation suggest that the non-equilibrium state of the electronic system slows down electron-phonon coupling with respect to the electronic equilibrium case in all studied materials: metals, semiconductors, and insulators. In semiconductors and insulators, it also alters the damage threshold of ultrafast nonthermal phase transitionsinduced by modification of the enteratomic potential due to electronic excitation. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2025 Electronic address https://hdl.handle.net/11104/0352862
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