Abstract
We have studied the exciton spin dynamics in CdSe/ZnSe quantum dots, comparing strictly resonant and nonresonant excitation. In case of strictly resonant excitation, excitons are generated in the quantum dot ground state, and because of the zero-dimensionality of the system no transient shift of the photoluminescence signal can be seen. No loss of the spin information is observed within the time window under investigation, if one excites the quantum dot eigenstates. Interestingly, even in case of nonresonant excitation, a high, time-independent polarization degree is obtained. We found maxima in the absolute value of the polarization degree if the laser excess energy amounts to a multiple of LO-phonon energies.
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