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- W4295679042 abstract "An unambiguous observation of the Bose-Einstein condensation (BEC) of excitons in a photoexcited bulk semiconductor and elucidation of its inherent nature have been longstanding problems in condensed matter physics. Here, we observe the quantum phase transition and a Bose-Einstein condensate appearing in a trapped gas of 1s paraexcitons in bulk Cu2O below 400 mK, by directly visualizing the exciton cloud in real space using mid-infrared induced absorption imaging that we realized in a dilution refrigerator. Our study shows that the paraexciton condensate is undetectable by conventional luminescence spectroscopy. We find an unconventionally small condensate fraction of 0.016 with the spatial profile of the condensate well described by mean-field theory. Our discovery of this new type of BEC in the purely matter-like exciton system interacting with a cold phonon bath could pave the way for the classification of its long-range order, and for essential understanding of quantum statistical mechanics of non-equilibrium open systems." @default.
- W4295679042 created "2022-09-14" @default.
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- W4295679042 date "2022-09-14" @default.
- W4295679042 modified "2023-10-10" @default.
- W4295679042 title "Observation of Bose-Einstein condensates of excitons in a bulk semiconductor" @default.
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- W4295679042 doi "https://doi.org/10.1038/s41467-022-33103-4" @default.
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