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Excitation by two-photon resonant absorption may be able to maintain the temperature of the orthoexcitonic system in Cu₂O sufficiently low, resulting in an excitonic density high enough to allow us to study the quantum Bose-Einstein statistical properties of a nearly ideal Bose gas. The luminescence spectra show that the orthoexcitonic system consists of two parts. One follows the usual Bose-Einstein statistics with chemical potential {μ}=0. The other is at an energy position corresponding to zero kinetic energy.
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Goto et al. (1997) studied this question.
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