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Abstract: The non elementary-boson nature of excitons controls Bose-Einsteincondensation in semiconductors. Composite excitons interact predominantlythrough Pauli exclusion; this produces dramatic couplings between bright anddark states. In microcavities, where bright excitons and photons formpolaritons, they force the condensate to be linearly polarized-as observed. Inbulk, they also force linear polarization, but of dark states, due to interbandCoulomb scatterings. To evidence this dark condensate, we thus need indirectprocesses, like the shift it induces on the bright exciton line.



Author: Monique Combescot, Odile Betbeder-Matibet, Roland Combescot

Source: https://arxiv.org/



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