Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 108: Poster: Ultra-fast phenomena / Optical properties / Semiconductor laser / Devices and device concepts

HL 108.5: Poster

Donnerstag, 3. April 2014, 17:00–20:00, P1

Formation and hybridization of Bloch and plasma oscillations — •Klaus Morawetz — Münster University of Applied Sciences, Stegerwaldstrasse 39, 48565 Steinfurt, Germany — International Institute of Physics (IIP), Avenida Odilon Gomes de Lima 1722, 59078-400 Natal, Brazil — Max-Planck- Institute for the Physics of Complex Systems, 01187 Dresden, Germany

Using a conserving relaxation-time approximation an analytic formula is derived which describes the time dependence of the dielectric function in a plasma created by a short intense laser pulse with an additional external electric field bias. This formula reproduces universal features of the formation of collective modes seen in experimental data of femtosecond spectroscopy (Phys. Rev. B 72 (2005) 233203). Due to the electric field Bloch oscillations in a semiconductor are created which form a hybridization with plasma oscillations. This short-time expansion of lower-order quantum perturbation theory can be used to describe the dynamics of strongly correlated classical systems (Phys. Rev. E 66 (2002) 022103).