Abstract
The photoluminescence dynamics of microcavity polaritons are investigated by ps time-resolved measurements as a function of the photon–exciton detuning in the low, non-resonant excitation regime. For negative detuning, we observe the appearance of a relaxation slow-down accompanied by a build-up of a non-equilibrium polariton population on the exciton-like part of the lower branch. Finally, the role in the PL dynamics of the dark excitonic states existing in microcavities containing several quantum wells as alternative relaxation channels is addressed.
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