Interplay between tightly focused excitation and ballistic propagation of polariton condensates in a ZnO microcavity
The formation and propagation of a polariton condensate under tightly focused excitation is investigated in a ZnO microcavity both experimentally and theoretically. Two-dimensional (2D) near-field and far-field images of the condensate are measured under quasicontinuous nonresonant excitation. The c...
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Veröffentlicht in: | Physical review. B 2015-12, Vol.92 (23), Article 235308 |
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Hauptverfasser: | , , , , , , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | The formation and propagation of a polariton condensate under tightly focused excitation is investigated in a ZnO microcavity both experimentally and theoretically. Two-dimensional (2D) near-field and far-field images of the condensate are measured under quasicontinuous nonresonant excitation. The corresponding spatial profiles are compared to a model based on the Gross-Pitaevskii equation under cylindrical geometry. This paper allows one 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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ISSN: | 1098-0121 2469-9950 1550-235X 2469-9969 |
DOI: | 10.1103/PhysRevB.92.235308 |