Polariton-polariton scattering: exact results through a novel approach

Details Polariton-polariton scattering: exact results through a novel approach Polariton-polariton scattering: exact results through a novel approach

2007-05-22

arxiv.org/abs/0705.3189v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

To be published in Europhysics Letters

Scientific paper

10.1209/0295-5075/79/17001

We present a fully microscopic approach to the transition rate of two exciton-photon polaritons. The non-trivial consequences of the polariton composite nature -- here treated exactly through a development of our composite-exciton many-body theory -- lead to results noticeably different from the ones of the conventional approaches in which polaritons are mapped into elementary bosons. Our work reveals an appealing fundamental scattering which corresponds to a photon-assisted exchange -- in the absence of Coulomb process. This scattering being dominant when one of the scattered polaritons has a strong photon character, it should be directly accessible to experiment. In the case of microcavity polaritons, it produces a significant enhancement of the polariton transition rate when compared to the one coming from Coulomb interaction. This paper also contains the crucial tools to securely tackle the many-body physics of polaritons, in particular towards its possible BEC.

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