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We describe effects of weak localization of exciton polaritons (EP's) and induced scattering of EP's into the zero-wave-vector mode in a planar semiconductor microcavity containing quantum wells (QW's). Coherent light emission in the direction normal to the surface under the tilted pumping can be explained in terms of the weak localization of EP's in QW's.
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Hanamura et al. (1996) studied this question.
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