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Excitations in Organic Solids$
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Vladimir Agranovich

Print publication date: 2008

Print ISBN-13: 9780199234417

Published to Oxford Scholarship Online: January 2009

DOI: 10.1093/acprof:oso/9780199234417.001.0001

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Polaritons: Excitonic States Taking Account of Retardation

Polaritons: Excitonic States Taking Account of Retardation

Excitations in Organic Solids

Vladimir M. Agranovich

Oxford University Press

This chapter presents the microscopical theory of polaritons, being coherent superposition of one exciton and one transverse photon state. The dispersion of polaritons including the effect of spatial dispersion, the polariton mechanism of exciton luminescence, the dielectric tensor and a phenomenology of the long wavelength excitons are presented. The giant radiative width of smallwave vector polaritons in one- and two-dimensional nanostructures (‘polariton superradiance’), as well as an effective radiative lifetime of two-dimensional polaritons and its dependence on temperature are considered.

Keywords:   polaritons, polariton dispersion, polariton superradiance, transverse photon, exciton luminescence, one-dimensional systems, two-dimensional systems, dielectric tensor, spatial dispersion, radiative lifetime

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