Comparison of magneto-optical properties of various excitonic complexes in CdTe and CdSe self-assembled quantum dots.

We present a comparative study of two self-assembled quantum dot (QD) systems based on II-VI compounds: CdTe/ZnTe and CdSe/ZnSe. Using magneto-optical techniques we investigated a large population of individual QDs. The systematic photoluminescence studies of emission lines related to the recombination of neutral exciton X, biexciton XX, and singly charged excitons (X+, X-) allowed us to determine average parameters describing CdTe QDs (CdSe QDs): X-XX transition energy difference 12 meV (24 meV); fine-structure splitting delta(1) = 0.14 meV (delta(1) = 0.47 meV); g-factor g = 2.12 (g = 1.71); diamagnetic shift gamma = 2.5 mu eV T-2 (gamma = 1.3 mu eV T-2). We find also statistically significant correlations between various parameters describing internal structure of excitonic complexes.