Regensburg 2010 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 59: Quantum Dots and Wires, Optical Properties V

HL 59.3: Vortrag

Donnerstag, 25. März 2010, 16:30–16:45, H14

Theory of phonon assisted relaxation in quantum dot systems — •Matthias-René Dachner, Janik Wolters, Felix Schlosser, Marten Richter, and Andreas Knorr — Institut für Theoretische Physik, Nichtlineare Optik und Quantenelektronik, Technische Universität Berlin, Hardenbergstraße 36, 10623 Berlin

We investigate microscopically the phonon assisted relaxation channels in an electrically pumped quantum dot (QD) system consisting of 0D QD states, 2D wetting layer (WL) states and 3D bulk states. For the WL–QD scattering multiphonon processes are included by a higher order Markovian approach based on a projection operator theory. Subsequently applying an effective second quantization treatment many body effects like Pauli blocking are included in the calculated scattering rates.

Furthermore, we investigate the population dynamics in the WL and observe carrier heating of the pumped system, where the temperature and current dependence is discussed [1].

[1] J. Wolters et al., Phys. Rev. B (accepted).