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• W2100796693 abstract "The femtosecond optical pump-probe technique was used to study dynamics of photoexcited electrons and coherent optical phonons in transition metals Zn and Cd as a function of temperature and excitation level. The optical response in time domain is well fitted by linear combination of a damped harmonic oscillation because of excitation of coherent ${E}_{2g}$ phonon and a subpicosecond transient response due to electron-phonon thermalization. The electron-phonon thermalization time monotonically increases with temperature, consistent with the thermomodulation scenario, where at high temperatures the system can be well explained by the two-temperature model, while below $ensuremath{approx}50phantom{rule{0.3em}{0ex}}mathrm{K}$ the nonthermal electron model needs to be applied. As the lattice temperature increases, the damping of the coherent ${E}_{2g}$ phonon increases, while the amplitudes of both fast electronic response and the coherent ${E}_{2g}$ phonon decrease. The temperature dependence of the damping of the ${E}_{2g}$ phonon indicates that population decay of the coherent optical phonon due to anharmonic phonon-phonon coupling dominates the decay process. We present a model that accounts for the observed temperature dependence of the amplitude assuming the photoinduced absorption mechanism, where the signal amplitude is proportional to the photoinduced change in the quasiparticle density. The result that the amplitude of the ${E}_{2g}$ phonon follows the temperature dependence of the amplitude of the fast electronic transient indicates that under the resonant condition both electronic and phononic responses are proportional to the change in the dielectric function." @default.
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• W2100796693 date "2005-05-06" @default.
• W2100796693 modified "2023-09-28" @default.
• W2100796693 title "Ultrafast dynamics of coherent optical phonons and nonequilibrium electrons in transition metals" @default.
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• W2100796693 doi "https://doi.org/10.1103/physrevb.71.184301" @default.
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