Savvidis, P.G., Baumberg, J.J., Porras, D., Whittaker, D., Skolnick, M. and Roberts, J.S.
Ring emission and exciton-pair scattering in semiconductor microcavities
PHYSICAL REVIEW B, 65, (73309), .
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Polariton microemitters are semiconductor devices that take advantage of the strong coupling of light and matter to produce efficient optical sources. Injecting an exciton gas into such a semiconductor microcavity can produce annular optical emission of a specific cone angle. We demonstrate that at higher exciton densities or temperatures, this ring continuously decreases in diameter due to the greater energy that can be carried off in exciton-pair scattering processes. These Coulomb-mediated exciton-exciton scatterings are shown to dominate the polariton relaxation and optical emission.
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