Dresden 2006 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 7: Superconductivity & Solids At Low Temperature - Poster Session

TT 7.29: Poster

Montag, 27. März 2006, 14:00–17:45, P1

Theory of Ultrafast Pump-Probe-Spectra of BCS-type Superconductors — •Sabine Körbel, Tilmann Kuhn, and Vollrath Martin Axt — Institut für Festkörpertheorie, Westfälische Wilhelms-Universität, Wilhelm-Klemm-Straße 10, 48149 Münster

Ultrafast optical excitation yields information about the microscopic interaction mechanisms in different materials. The theoretical description and modelling has been successfully carried out for semiconductors within the density-matrix-formalism. We applied the same formalism to the BCS-type superconductor. In particular we study the dynamical electrical conductivity after exciting the system by a picosecond pump pulse with an energy slightly above the superconducting gap. Our results show that the nonequilibrium dynamics of the gap is strongly correlated to the dynamics of the quasiparticles which are generated by the pump pulse, and their coherences. We show the influence of particle number and energy distribution on pump probe spectra.