Abstract
Teh unusual Raman scattering by Bose-condensed excitons caused by simultaneous recombination (or creation) of two excitons is investigated. It is shown that this scattering takes place only in the Bose-condensed interacting exciton system and is accompanied by the simultaneous recombination (or creation) of two excitons with equal and opposite momenta leaving the occupation numbers of excitonic states with p ≠ 0 unchanged. If ω > 2Ω, it is accompanied by the appearance of Stokes and antiStokes lines on frequencies ω ± 2Ω in the Raman scattering spectrum of the system (ω is the frequency of the incident light, Ω is the frequency corresponding to the recombination of an exciton with zero momentum). If ω < 2Ω, the line on frequency ω + 2Ω corresponding to the Raman scattering and the line on frequency 2Ω − ω corresponding to the induced two-photon emission caused by simultaneous two-exciton recombination appear. The quantitative estimation shows that both the Raman scattering and the induced two-photon emission can be detected experimentally and, therefore, can be used as a new method to reveal Bose condensation of excitons.
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