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The temporal evolution of the ambipolar diffusivity of optically excited electron–hole pairs is investigated for a strained quantum well structure by temporally and spatially resolved pump and probe experiments. Dependent on the excitation conditions the diffusivity transients reflect the cooling and heating processes of excitons as well as the formation dynamics of excitons out of free electron–hole pairs within less than 10 ps. Diffusivity transients obtained by Monte Carlo simulations of a simplified excitonic Boltzmann equation display all features of the experimental curves and support our interpretation of the lateral propagation dynamics in terms of formation, cooling and heating of excitons.
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Große et al. (1997) studied this question.
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