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Revealing the dark side of a bright exciton–polariton condensate

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  • J. -M. Ménard

    (University of Regensburg)

  • C. Poellmann

    (University of Regensburg)

  • M. Porer

    (University of Regensburg)

  • U. Leierseder

    (University of Regensburg)

  • E. Galopin

    (CNRS-Laboratoire de Photonique et Nanostructures, Route de Nozay)

  • A. Lemaître

    (CNRS-Laboratoire de Photonique et Nanostructures, Route de Nozay)

  • A. Amo

    (CNRS-Laboratoire de Photonique et Nanostructures, Route de Nozay)

  • J. Bloch

    (CNRS-Laboratoire de Photonique et Nanostructures, Route de Nozay)

  • R. Huber

    (University of Regensburg)

Abstract

Condensation of bosons causes spectacular phenomena such as superfluidity or superconductivity. Understanding the nature of the condensed particles is crucial for active control of such quantum phases. Fascinating possibilities emerge from condensates of light–matter-coupled excitations, such as exciton–polaritons, photons hybridized with hydrogen-like bound electron–hole pairs. So far, only the photon component has been resolved, while even the mere existence of excitons in the condensed regime has been challenged. Here we trace the matter component of polariton condensates by monitoring intra-excitonic terahertz transitions. We study how a reservoir of optically dark excitons forms and feeds the degenerate state. Unlike atomic gases, the atom-like transition in excitons is dramatically renormalized on macroscopic ground state population. Our results establish fundamental differences between polariton condensation and photon lasing and open possibilities for coherent control of condensates.

Suggested Citation

  • J. -M. Ménard & C. Poellmann & M. Porer & U. Leierseder & E. Galopin & A. Lemaître & A. Amo & J. Bloch & R. Huber, 2014. "Revealing the dark side of a bright exciton–polariton condensate," Nature Communications, Nature, vol. 5(1), pages 1-5, December.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms5648
    DOI: 10.1038/ncomms5648
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    Cited by:

    1. Anna Grudinina & Maria Efthymiou-Tsironi & Vincenzo Ardizzone & Fabrizio Riminucci & Milena De Giorgi & Dimitris Trypogeorgos & Kirk Baldwin & Loren Pfeiffer & Dario Ballarini & Daniele Sanvitto & Nin, 2023. "Collective excitations of a bound-in-the-continuum condensate," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
    2. Kai Peng & Renjie Tao & Louis Haeberlé & Quanwei Li & Dafei Jin & Graham R. Fleming & Stéphane Kéna-Cohen & Xiang Zhang & Wei Bao, 2022. "Room-temperature polariton quantum fluids in halide perovskites," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    3. Ke Wei & Qirui Liu & Yuxiang Tang & Yingqian Ye & Zhongjie Xu & Tian Jiang, 2023. "Charged biexciton polaritons sustaining strong nonlinearity in 2D semiconductor-based nanocavities," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    4. Philip A. Thomas & Kishan S. Menghrajani & William L. Barnes, 2022. "All-optical control of phase singularities using strong light-matter coupling," Nature Communications, Nature, vol. 13(1), pages 1-6, December.

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