Abstract
When CuCl and CuBr are excited in their band to band absorption, biexcitons are generated from carriers and excitons. They are characterized by a Boltzmann distribution function with a temperature higher than that of the sample. They decay radiatively from their ground state to exciton-polariton states. Broad emission bands are observed.
When biexcitons are directly created by a resonant two-photon absorption in their ground state, they may form a Bose-Einstein condensate. When they recombine radiatively, sharp emission bands are indeed observed on the high energy edge of the broad emission bands.
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Grun, J.B., Levy, R., Ostertag, E., Vu Duy Phach, H., Port, H. (1976). Biexciton luminescence in CuCl and CuBr. In: Physics of Highly Excited States in Solids. Lecture Notes in Physics, vol 57. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-07991-2_75
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DOI: https://doi.org/10.1007/3-540-07991-2_75
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