Statistics of quantum dot exciton fine structure splittings and their polarization orientations

The fine structure splitting of neutral excitons in InGaAs quantum dots is investigated using polarization sensitive photoluminescence. The QDs were grown with an in situ annealing step to shift the emission wavelength to View the MathML source. Statistics of the fine structure reveal a large spread in magnitude and little preferential orientation of the polarization axis. We speculate that these findings are due to the redistribution of QD material during the annealing step.