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We observe resonant enhancement of the microcavity exciton-polariton emission by more than three orders of magnitude when the excitation laser is tuned to a single longitudinal-optical-phonon energy above the polariton energies. Our finding provides a scheme to efficiently populate k_=0 polaritons which bypasses the slow-acoustic-phonon thermalization process.
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Pau et al. (1997) studied this question.
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