Regensburg 2007 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 13: Poster 1

HL 13.70: Poster

Montag, 26. März 2007, 15:00–17:30, Poster A

Turn-on dynamics and modulation response in semiconductor quantum dot lasers — •Ermin Malić, Moritz Bormann, Philipp Hövel, Matthias Kuntz, Dieter Bimberg, Andreas Knorr, and Eckehard Schöll — Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, Germany

We present a theoretical simulation of the turn-on dynamics of InAs/GaAs quantum dot semiconductor lasers driven by an electrical current pulse. Our approach goes beyond standard phenomenological rate equations. It contains microscopically calculated Coulomb scattering rates describing Auger transitions between quantum dots and the wetting layer. In agreement with experimental results, we predict a strong damping of relaxation oscillations on a nanosecond time scale. Our simulations explicitly take the strongly nonlinear dependence of the Coulomb scattering rates on the wetting layer charge carrier densities, and we show their crucial importance for the understanding of the turn-on dynamics of quantum dot lasers.