Abstract
The relaxation behaviour of indirect exciton systems so far has been studied by analyzing the resonant secondary emission (RSE) observed under stationary optical excitation at varying photon energies in the exciton absorption. Applying second-order perturbation theory it is straightforward to show that RSE spectra reflect the exciton distribution function, the energetic positions and intensities containing the necessary information on the various phonon scattering processes and relative scattering probabilities. By analyzing exciton spectra along these lines we, in the past, thoroughly studied the indirect gap materials AgBr and AgCl (for references see1,2), but similar phenomena associated with non-thermal exciton distribution were observed in direct gap materials, too (see e.g.3,4 and references therein).
Published Version
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