Abstract
We study the dynamics of a system consisting of exciton polaritons and biexcitons in bulksemiconductors. The polariton dispersion curve is scanned in a pump-and-probe experimentby looking at different excitation and detection wavelengths. This allows us to determinethe influence of the polariton wavevector on polariton-spin relaxation processes and ontheir overall population dynamics. We perform these studies at low temperatures in bulkCuCl samples on a sub-picosecond timescale. We evaluate how the optical properties closeto the exciton resonance develop with time from induced absorption to gain, depending onthe wavelength and the intensity of excitation. This allows us to determine thepolariton- and biexciton-population relaxation dynamics inside the bottleneck spectralregion, and their spin dynamics, and reveals the importance of scattering and propagationeffects.
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