Bose-Einstein condensation of excitons and polaritons
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