Bose-Einstein condensation in semiconductors: the key role of dark excitons

Details Bose-Einstein condensation in semiconductors: the key role of dark excitons Bose-Einstein condensation in semiconductors: the key role of dark excitons

2007-06-16

arxiv.org/abs/0706.2419v1

Phys. Rev. Lett. 99, 176403 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.99.176403

The non elementary-boson nature of excitons controls Bose-Einstein condensation in semiconductors. Composite excitons interact predominantly through Pauli exclusion; this produces dramatic couplings between bright and dark states. In microcavities, where bright excitons and photons form polaritons, they force the condensate to be linearly polarized--as observed. In bulk, they also force linear polarization, but of dark states, due to interband Coulomb scatterings. To evidence this dark condensate, we thus need indirect processes, like the shift it induces on the (bright) exciton line.

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