Magneto-optical properties of excitonic complexes in GaAs self-assembled quantum dots

We report a detailed experimental investigation of the magneto optical properties of different excitonic complexes (neutral exciton, neutral biexciton and charged exciton) confined in self-assembled GaAs/AlGaAs strain free quantum dots grown by droplet epitaxy, where all piezoelectric effects are lacking. We measured the Land`e g factor and the diamagnetic coefficient for several quantum dots spanning an interval of ∼ 200 meV of the emission energy. The dependence of g factor and on quantum dot size and shape is discussed together with a comparison with Stranski–Krastanov and fluctuation induced GaAs quantum dots, as well as with excitons confined in quantum wells.