Femtosecond formation of collective modes due to mean-field fluctuations

Article

关键词: RELAXATION-TIME APPROXIMATION;    QUANTUM KINETICS;    SPECTROSCOPY;    CONSERVATION;    BUILDUP;    PLASMA;    PHONON;   

DOI  :  10.1103/PhysRevB.72.233203

来源: SCIE

【 摘 要 】

Starting from a quantum kinetic equation including the mean field and a conserving relaxation-time approximation we derive an analytical formula which describes the time dependence of the dielectric function in a plasma created by a short intense laser pulse. This formula reproduces universal features of the formation of collective modes seen in recent experimental data of femtosecond spectroscopy. The presented formula offers a tremendous simplification for the description of the formation of quasiparticle features in interacting systems. Numerical demanding treatments can now be focused on effects beyond these gross features found here to be describable analytically.

【 授权许可】

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