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Universal condensation threshold dependence on pump beam size for exciton-polaritons.

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Titel: Universal condensation threshold dependence on pump beam size for exciton-polaritons.
Autoren: Utesov, Oleg I., Park, Min, Choi, Daegwang, Choi, Soohong, Park, Suk In, Kang, Sooseok, Song, Jin Dong, Osipov, Alexey N., Yulin, Alexey V., Cho, Yong-Hoon, Choi, Hyoungsoon, Aranson, Igor S., Koniakhin, Sergei V.
Quelle: Communications Physics; 7/10/2025, Vol. 8 Issue 1, p1-9, 9p
Schlagwörter: BOSE-Einstein condensation, QUANTUM coherence, OPTICAL pumping, POLARITONS, OPTICAL properties, PHOTONS
Abstract: Exciton-polariton Bose-Einstein condensates (BECs) in semiconductor microcavities represent a peculiar example of a quantum coherent state on macroscopic length scales created by all-optical excitation. Current studies and applications of polariton BECs include quantum simulators, topology, coherent light sources engineering, information processing, and controllable energy transferring. However, many fundamental aspects of condensation are still not comprehensively understood. Here, we perform experimental and theoretical studies of probably the most popular setup – condensation due to a single Gaussian incoherent laser pumping profile. We have shown that the pumping intensity threshold, a crucial condensation characteristic, is explicitly related to the polariton spectral line properties. The latter are dependent only on several combinations of the respective microstructure parameters. This study paves the way toward controllable condensate creation and utilization. It also provides insights into the characterization of out-of-equilibrium quantum light-matter coherent states. Exciton-polariton Bose-Einstein condensates in semiconductor microcavities are a unique manifestation of quantum coherence on a macroscopic scale. By examining the relationship between pumping intensity and polariton spectral properties, the authors demonstrate the cavity parameter space collapse and fundamental limit on the minimal power required for Bose-Einstein condensation. [ABSTRACT FROM AUTHOR]
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Abstract:Exciton-polariton Bose-Einstein condensates (BECs) in semiconductor microcavities represent a peculiar example of a quantum coherent state on macroscopic length scales created by all-optical excitation. Current studies and applications of polariton BECs include quantum simulators, topology, coherent light sources engineering, information processing, and controllable energy transferring. However, many fundamental aspects of condensation are still not comprehensively understood. Here, we perform experimental and theoretical studies of probably the most popular setup – condensation due to a single Gaussian incoherent laser pumping profile. We have shown that the pumping intensity threshold, a crucial condensation characteristic, is explicitly related to the polariton spectral line properties. The latter are dependent only on several combinations of the respective microstructure parameters. This study paves the way toward controllable condensate creation and utilization. It also provides insights into the characterization of out-of-equilibrium quantum light-matter coherent states. Exciton-polariton Bose-Einstein condensates in semiconductor microcavities are a unique manifestation of quantum coherence on a macroscopic scale. By examining the relationship between pumping intensity and polariton spectral properties, the authors demonstrate the cavity parameter space collapse and fundamental limit on the minimal power required for Bose-Einstein condensation. [ABSTRACT FROM AUTHOR]
ISSN:23993650
DOI:10.1038/s42005-025-02198-8