Abstract
The dynamics of the photoluminescence negative circular polarization of an ensemble of InP/(In,Ga)P quantum dots is studied. It was found that, the time-resolved polarization has no oscillations in the magnetic field in the Voigt geometry. At the same time, with increasing field, the polarization decreases to zero. This effect is explained by the specificities of the spin dynamics of a negatively charged exciton; in particular, by the fact that, in the ground state, its spin dynamics is determined by a heavy hole. It is shown that, in order that the photoluminescence be depolarized by a magnetic field, it is necessary to overcome the field of dynamically polarized nuclear spins acting on the electron spins.
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