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The spin dynamics of positively (X$^{+}$) and negatively (X$^{-}$) chargedexcitons in InP/In$_{0.48}$Ga$_{0.52}$P quantum dots subject to a magneticfield is studied. We find that a characteristic feature of the system understudy is the presence of nuclear quadrupole interaction, which leads tostabilization of the nuclear and electron spins in a quantum dot in zeroexternal magnetic field. In detail, the nuclear quadrupole interaction leads topinning of the Overhauser field along the quadrupole axis, which is close tothe growth axis of the heterostructure. The nuclear effects are observed onlywhen resident electrons are confined in the quantum dots, i.e. for X$^{-}$trion photoexcitation. The presence of X$^{-}$ and X$^{+}$ trion contributionsto the photoluminescence together with the quadrupole interaction significantlyaffects the dynamics of optical orientation in Voigt magnetic field. In absenceof dynamic nuclear spin polarization the time evolution of thephotoluminescence polarization was fitted by a form which describes theelectron spin relaxation in "frozen" nuclear field fluctuations. In relativelylarge external magnetic fields exceeding 60 mT good agreement between theoryand experiment is achieved.

physical review. b./physical review. b

Spin beats in the photoluminescence polarization dynamics of charged  excitons in InP/(In,Ga)P quantum dots in presence of nuclear quadrupole  interaction