Heat conductivity of copper in two-temperature state
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Electron–ion relaxation lasts few tens of picoseconds in a submicrometer surface layer of metal after irradiation by femtosecond laser pulse of moderate intensity. During this stage, the electron temperature is many times higher than ion (lattice) temperature. The rate of this relaxation is slower for noble metals due to their small electron–ion coupling. Thus, effects caused by high electron temperature reveal more obviously for those metals. To study electron transport in noble metal nanofilms, we combine the first-principle calculations and our analytical models. The newly calculated electron–phonon coupling and heat conductivity are used in two-temperature hydrodynamics modeling. Results of such modeling are in good agreement with the experimental data and molecular dynamics simulation.
KeywordsHeat Conductivity Density Functional Theory Calculation Liquid Copper Mass Attenuation Coefficient Quantum Molecular Dynamic
The research has been performed under financial support from Russian Science Foundation (RSCF) (Project No. 14-19-01599).
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