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Relaxation des polaritons dans une microcavité contenant un gaz d'électrons

Abstract : We have studied the relaxation of polaritons in a microcavity containing an electron gas of tunable density. The electron density, which has been directly measured, can be varied between 0 and 10^11 cm-2, independently of the polariton density. We were thus able to study a new relaxation mechanism: relaxation by polariton-electron collisions, which was scarcely understood before. Thanks to this mechanism, the occupation factors in polariton states near k//=0 can be increased of one order of magnitude. Contrary to a theoretical proposal, we have found that polariton-electron collisions are a relaxation mechanism as efficient as polariton-polariton collisions. The observed difference between theory and experiment is discussed in the manuscript. Finally, we have studied the time resolved photoluminescence of the polaritons, and showed that the observed accelerations of the dynamics come in great part from the physics of exciton formation.
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Contributor : Mathieu Perrin <>
Submitted on : Friday, December 8, 2006 - 9:23:04 PM
Last modification on : Wednesday, December 9, 2020 - 3:14:00 PM
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  • HAL Id : tel-00119378, version 1


Mathieu Perrin. Relaxation des polaritons dans une microcavité contenant un gaz d'électrons. Matière Condensée [cond-mat]. Université Pierre et Marie Curie - Paris VI, 2006. Français. ⟨tel-00119378⟩



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