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Bose-Einstein condensation of excitons and polaritons

Bose-Einstein condensation of excitons and polaritons

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General concepts <strong>of</strong> <strong>excitons</strong><br />

quasi number conservation. Cf. proton decay <strong>and</strong> H atom BEC<br />

crossover: quasiequilibrium BEC ! nonequilibrium BEC ! immediate decay<br />

incoherent<br />

phonon<br />

emission<br />

photon emission: weak probe <strong>of</strong> instantaneous energy <strong>and</strong> momentum<br />

distribution<br />

conduction states<br />

valence states<br />

“Wannier” limit: electron <strong>and</strong> hole form atom<br />

like positronium that has center <strong>of</strong> mass velocity<br />

Excitonic Rydberg: Excitonic radius:<br />

" = " Ps<br />

! 2<br />

a = !a Ps

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