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HL: Halbleiterphysik
HL 24: Ultra fast phenomena
HL 24.4: Talk
Tuesday, March 28, 2006, 16:00–16:15, POT 151
Femtosecond formation of collective modes due to meanfield fluctuations — •K. Morawetz1,2, B. Schmidt1, M. Schreiber1, and P. Lipavsky3 — 1Institute of Physics, Chemnitz University of Technology, 09107 Chemnitz, Germany — 2Max-Planck-Institute for the Physics of Complex Systems, Nöthnitzer Str. 38, 01187 Dresden, Germany — 3Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, 12116 Prague 2
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.
[1] K. Morawetz, P. Lipavský, M. Schreiber, Femtosecond formation of collective modes due to meanfield fluctuations, Phys. Rev. B in press, cond-mat/0506443