Femtosecond formation of collective modes due to meanfield fluctuations

Details Femtosecond formation of collective modes due to meanfield fluctuations Femtosecond formation of collective modes due to meanfield fluctuations

2005-06-17

arxiv.org/abs/cond-mat/0506443v3

Phys.Rev.B72:233203,2005

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages 3 figures, PRB in press

Scientific paper

10.1103/PhysRevB.72.233203

Starting from a quantum kinetic equation including the mean field and a conserving relaxation-time approximation we derive an analytic 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.

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