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HL: Halbleiterphysik

HL 24: Ultra fast phenomena

HL 24.11: Vortrag

Dienstag, 28. März 2006, 17:45–18:00, POT 151

Ultrafast near resonant nonlinear propagation in GaAs - a theoretical model study — •Martin Schaarschmidt, Jan Kloppenburg, and Andreas Knorr — Institut für Theoretische Physik, Nichtlineare Optik und Quantenelektronik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, Germany

Pulse propagation close but well below the semiconductor excitonic resonance is investigated. In this spectral region the excitonic resonance often dominates over most off-resonant material resonances. We discuss the suitability of different model systems for the description of occuring material nonlinearities ranging from Kerr nonlinearity, excitonic Pauli-Blocking up to semiconductor Bloch equations (SBE) including many particle effects. The differences between the nonlinear Schrödinger equation with Kerr-type nonlinearity usually applied for propagation far from the resonance, the optical Bloch equations known from propagation in atomic gases and the Maxwell semiconductor Bloch equations are studied and compared with recent experiments.