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- W4379919387 abstract "The development of patterned multi-quantum well heterostructures in GaAs/AlGaAs waveguides has recently allowed to achieve exciton-polariton condensation in a topologically protected bound state in the continuum (BIC). Remarkably, condensation occurred above a saddle point of the polariton dispersion. A rigorous analysis of the condensation phenomenon in these systems, as well as the role of the BIC, is still missing. In the present Letter we theoretically and experimentally fill this gap, by showing that polariton confinement resulting from the negative effective mass and the photonic energy gap in the dispersion play a key role in enhancing the relaxation towards the condensed state. In fact, our results show that low-threshold polariton condensation is achieved within the effective trap created by the exciting laser spot regardless of whether the resulting confined mode is long-lived (polariton BIC) or short-lived (lossy mode). In both cases, the spatial quantization of the polariton condensate and the threshold differences associated to the corresponding state lifetime are measured and characterized. For a given negative mass, a slightly lower condensation threshold from the polariton BIC mode is found and associated to its suppressed radiative losses as compared to the lossy one." @default.
- W4379919387 created "2023-06-09" @default.
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- W4379919387 date "2023-06-05" @default.
- W4379919387 modified "2023-09-27" @default.
- W4379919387 title "Bose-Einstein Condensation in Gap-Confined Exciton-Polariton States" @default.
- W4379919387 doi "https://doi.org/10.48550/arxiv.2306.03309" @default.
- W4379919387 hasPublicationYear "2023" @default.
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