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Dynamique cohérente des polaritons de microcavité de semiconducteurs

Abstract : Semiconductor microcavity polaritons coherent dynamics In semiconductor microcavities, a strong coupling regime can be achieved between the Fabry-Pérot cavity mode and the confined exciton of the quantum well. It results in new eigenstates, which are mixed photon-exciton states, the microcavity polaritons. As compared to bare excitons, microcavity polaritons have a very different dispersion and density of states, which induce a strong modification of the nonlinearities and the optical properties of the system. This work is devoted to the study of the coherent nonlinear dynamics by means of four wave mixing experiments. Due to their excitonic component, polaritons can interact via Coulomb interaction as well as phase space filling (Pauli blocking). First, we determine the contribution of these intrinsic nonlinearities to the coherent response of the system, by analysing our measurements thanks to the numerical resolution of the Maxwell-Bloch equations. Then, in order to study the influence of the dispersion on the polaritons dynamics, we have performed an angle-resolved four wave mixing experiment. We show an inhibition of the loss of the coherence in the center of the Brillouin zone. These results are in very good agreement with a model describing the collision broadening due to polariton-polariton scattering, which remains weak as long as the excitonic reservoir is not accessible. Additionnaly, in the parametric oscillation regime, when the polariton-polariton scattering can be stimulated by final state occupation, we study the dynamics of the pump polaritons. We find a very strong quenching of the coherence under excitation at the « magic angle ».
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Contributor : Agnes Huynh <>
Submitted on : Wednesday, February 26, 2003 - 12:52:41 AM
Last modification on : Monday, December 14, 2020 - 9:50:47 AM
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  • HAL Id : tel-00002490, version 1


Agnès Huynh. Dynamique cohérente des polaritons de microcavité de semiconducteurs. Matière Condensée [cond-mat]. Université Pierre et Marie Curie - Paris VI, 2002. Français. ⟨tel-00002490⟩



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