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arXiv · 1510.06716

Interplay between tightly focused excitation and ballistic propagation of polariton condensates in a ZnO microcavity

Rereao Hahe·Christelle Brimont·Pierre Valvin·Thierry Guillet·Feng Li·Mathieu Leroux·Jesus Zuniga-Perez·Xavier Lafosse·Gilles Patriarche·Sophie Bouchoule
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Abstract

The formation and propagation of a polariton condensate under tightly focused excitation is investigated in a ZnO microcavity both experimentally and theoretically. 2D near-field and far-field images of the condensate are measured under quasi-continuous non-resonant excitation. The corresponding spatial profiles are compared to a model based on the Gross-Pitaevskii equation under cylindrical geometry. This work allows to connect the experiments performed with a small excitation laser spot and the previous kinetic models of condensation in a 2D infinite microcavity, and to determine the relevant parameters of both the interaction and the relaxation between the reservoir and the condensate. Two main parameters are identified: the exciton-photon detuning through the polariton effective mass and the temperature, which determines the efficiency of the relaxation from the reservoir to the condensate.

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Rereao Hahe, Christelle Brimont, Pierre Valvin, Thierry Guillet, Feng Li, Mathieu Leroux, Jesus Zuniga-Perez, Xavier Lafosse, Gilles Patriarche, Sophie Bouchoule. 2016-01-05. Interplay between tightly focused excitation and ballistic propagation of polariton condensates in a ZnO microcavity. https://doi.org/10.1103/physrevb.92.235308

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