Abstract
In doped semiconductors at low temperatures free excitons(FE) become bound to impurities as exciton impurity complexes (EICs) and no longer exist as separate entities. From the spectroscopic study of EIC it has been established that the energy levels of an EIC are qualitatively similar to that of the impurity to which it is bound[1]. Two problems associated with phonon absorption by the EIC are discussed in this paper. The first could arise if there is an increase of the Auger nonradiative decay due to the transition of the EIC to one of its excited states[2]. The second is concerned with the possible dissociation of the EIC when the phonon energy equals the FE binding energy[3]. To shed light on these problems we have undertaken a study of the EIC excitation by nonequilibrium acoustic phonons.
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