Abstract
The effect of biexcitons on the Stark effect in GaAs and CdS quantum dots (QDs) has been investigated theoretically using a time-dependent perturbation technique. Our results show that the redshift, which usually occurs in QD energy levels, changes to a blueshift when account is taken of biexciton effects. The results are obtained for a single-quantum dot as well as for an inhomogeneous distribution of quantum dots. A comparison has also been made between the Stark effect in GaAs and in CdS crystals and it has been found that the Stark effect in GaAs is stronger than in CdS quantum dots. This can be attributed to the difference in biexciton binding energies of the two materials.
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