Dresden 2017 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 33: Quantum Dots: Optical Properties I

HL 33.9: Talk

Tuesday, March 21, 2017, 12:15–12:30, POT 81

Theoretical modelling of absorption spectra from differently charged quantum dots — •Matthias Holtkemper, Doris E. Reiter, and Tilmann Kuhn — Institut für Festkörpertheorie, Universität Münster, Wilhelm-Klemm-Str. 10, 48149 Münster

Semiconductor quantum dots (QDs) are promising structures for realisations in quantum information technology and spintronics. Apart from the ground state exciton also excited exciton states become relevant for dynamical processes like optical spin control, relaxation or charged biexciton cascades. Here we present a systematic analysis of absorption spectra for negatively, neutrally and positively charged QDs with a focus on excited excitonic states. To be specific, we model the QD using kp-theory within a configuration interaction approach. The QD confinement is approximated by a harmonic potential. We include the direct and short range exchange Coulomb interaction. The role of the different interactions is investigated in detail to give a fundamental understanding of the relevant effects. We discuss trends in the spectra while tuning the interaction strengths and study the differences and commonalities between differently charged QDs.