Abstract
Multiexcitons confined in InGaAs/GaAs quantum dots (QDs) with lateral sizes slightly exceeding the exciton Bohr radius a X have been investigated by magneto-photoluminescence spectroscopy. The biexciton binding energy has been found to increase strongly with decreasing dot size. A magnetic field reduces the biexciton binding energy due to the spin-splitting of the exciton. A three-exciton complex is shown to exist due to the geometric confinement potential of the QD. A magnetic field reduces the exciton–exciton repulsion in the three-exciton complex when the magnetic length becomes smaller than the QD size.
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