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HL: Fachverband Halbleiterphysik

HL 29: Quantum dots: Optical properties II

HL 29.1: Vortrag

Mittwoch, 25. März 2009, 09:30–09:45, BEY 154

Multiparticle Calculations for Single GaN/AlN Quantum Dots - Results and Comparison — •Gerald Hönig, Momme Winkelnkemper, Andrei Schliwa, and Dieter Bimberg — Institut für Festkörperphysik, Technische Universität Berlin, D-10623 Berlin, Germany

Despite tremendous advances in single quantum dot (QD) spectroscopy of GaN/AlN QDs, many of their properties, especially the Coulomb-interactions in multiparticle-systems, are only poorly understood. In this theoretical work we investigate different calculation methods for such interactions based on 8-band-kp theory.

Configuration-interaction (CI) calculations for this QD-system fail due to an insufficient basis size, which is limited by the computational expense. Self-consistent calculations within the Hartree-approximation have been performed, neglecting exchange- and correlation-effects. Different approaches (e.g. local density based approximations) are used to include these effects, correcting the Hartree-energies of excitons, trions, biexcitons confined in QDs with different structural properties and giving more realistic results for recombination energies. We will report our results and compare the different methods.