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Observation of Bose-Einstein condensates of excitons in a bulk semiconductor

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  • Yusuke Morita

    (The University of Tokyo)

  • Kosuke Yoshioka

    (The University of Tokyo
    The University of Tokyo)

  • Makoto Kuwata-Gonokami

    (The University of Tokyo)

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.

Suggested Citation

  • Yusuke Morita & Kosuke Yoshioka & Makoto Kuwata-Gonokami, 2022. "Observation of Bose-Einstein condensates of excitons in a bulk semiconductor," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-33103-4
    DOI: 10.1038/s41467-022-33103-4
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    2. Kosuke Yoshioka & Eunmi Chae & Makoto Kuwata-Gonokami, 2011. "Transition to a Bose–Einstein condensate and relaxation explosion of excitons at sub-Kelvin temperatures," Nature Communications, Nature, vol. 2(1), pages 1-5, September.
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