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Exciton spin dynamics in quasi-spherical CdS quantum dots is studied indetail experimentally and theoretically. Exciton states are calculated usingthe 6-band k.p Hamiltonian. It is shown that for various sets of Luttingerparameters, when the wurtzite lattice crystal field splitting and Coulombinteraction between the electron-hole pair are taken into account exactly, boththe electron and hole wavefunction in the lowest exciton state are of S-type.This rules out the spatial-symmetry-induced origin of the dark exciton in CdSquantum dots. The exciton bleaching dynamics is studied using time- andpolarization-resolved transient absorption technique of ultrafast laserspectroscopy. Several samples with a different mean size of CdS quantum dots indifferent glass matrices were investigated. This enabled the separation ofeffects that are typical for one particular sample from those that are generalfor this type of material. The experimentally determined dependence of theelectron spin relaxation rate on the radius of quantum dots agrees well withthat computed theoretically.

Exciton spin dynamics in spherical CdS quantum dots