Abstract
The dynamics of exciton interaction with charge carriers in GaAs, excited by a cw light source and subjected to collisions with free carriers, which are independently created by a picosecond light pulse, is studied by a time-resolved dual-channel modulated luminescence correlation technique. The dynamics reveals a decreased exciton generation rate at a higher temperature of charge carriers and a strong exciton scattering on hot free carriers that heats the excitons and effectively quenches luminescence due to smaller exciton-photon coupling at an elevated temperature of excitons.
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