Influence of the Local Field Effects on the Determination of the Exchange Energy of Excitons
One investigates the influence of the local field effects on the interpretation of the excitonic polariton curves in cubic semiconductors. It is shown that in real compounds where the background dielectric constant is greater than one, and where the electron and the hole are weakly bound, the usual description of the polariton effect can be a great deal altered. A careful examination of the effective field acting on the exciton is needed to deduce the exchange energy A from such an experiment as resonant Brillouin scattering on excitonic polaritons; taking the local field effects into account can modify the value of A up to an order of magnitude.
KeywordsExchange Energy Physical Review Range Part Frenkel Exciton Degenerate Level
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