Berlin 2005 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 12: Quantenpunkte und -dr
ähte: Optische Eigenschaften II

HL 12.5: Vortrag

Freitag, 4. März 2005, 16:00–16:15, TU P-N201

8-band k·p-theory for Wurtzite Crystals: Electronic Structure of InGaN Quantum Dots — •Momme Winkelnkemper, Andrei Schliwa, Robert Seguin, Sven Rodt, and Dieter Bimberg — Institut für Festkörperphysik, Technische UniversitätBerlin

We present an 8-band k·p-model for the calculation of single particle states in wurtzite-type semiconductor quantum dots. Special attention is paid to the influence of pyro- and piezoelectric effects since they have a large impact on electron and hole states, the oscillator strength, as well as the Coulomb interaction within few-particle states like excitons, biexcitons, trions, etc. To calculate all these effects (a) the classical 8-band k·p-model is extended to include strain as well as piezoelectric effects similar to the treatment of cubic semiconductors and pyroelectric effects and (b) a configuration interaction method is employed to account for all the few-particle effects like direct Coulomb interaction, exchange and correlation. Finally our results are compared to recent experimental results obtained by cathodoluminescence measurements on single InGaN quantum dots.
Parts of this work are funded by Sfb 296 of DFG and SANDiE Network of Excellence of the European Commission, contract number NMP4-CT-2004-500101.