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Dispersion relation of the collective excitations in a resonantly driven polariton fluid

Author

Listed:
  • Petr Stepanov

    (Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel)

  • Ivan Amelio

    (INO-CNR BEC Center and Dipartimento di Fisica, Universita` di Trento)

  • Jean-Guy Rousset

    (Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel
    Institute of Experimental Physics, Faculty of Physics, University of Warsaw)

  • Jacqueline Bloch

    (Centre de Nanosciences et de Nanotechnologies, CNRS, Université Paris-Sud, Université Paris-Saclay)

  • Aristide Lemaître

    (Centre de Nanosciences et de Nanotechnologies, CNRS, Université Paris-Sud, Université Paris-Saclay)

  • Alberto Amo

    (Univ. Lille, CNRS, Physique des Lasers Atomes et Molécules)

  • Anna Minguzzi

    (Univ. Grenoble Alpes, CNRS, LPMMC)

  • Iacopo Carusotto

    (INO-CNR BEC Center and Dipartimento di Fisica, Universita` di Trento)

  • Maxime Richard

    (Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel)

Abstract

Exciton-polaritons in semiconductor microcavities constitute the archetypal realization of a quantum fluid of light. Under coherent optical drive, remarkable effects such as superfluidity, dark solitons or the nucleation of vortices have been observed, and can be all understood as specific manifestations of the condensate collective excitations. In this work, we perform a Brillouin scattering experiment to measure their dispersion relation $$\omega ({\bf{k}})$$ ω ( k ) directly. The results, such as a speed of sound which is apparently twice too low, cannot be explained upon considering the polariton condensate alone. In a combined theoretical and experimental analysis, we demonstrate that the presence of an excitonic reservoir alongside the polariton condensate has a dramatic influence on the characteristics of the quantum fluid, and explains our measurement quantitatively. This work clarifies the role of such a reservoir in polariton quantum hydrodynamics. It also provides an unambiguous tool to determine the condensate-to-reservoir fraction in the quantum fluid, and sets an accurate framework to approach ideas for polariton-based quantum-optical applications.

Suggested Citation

  • Petr Stepanov & Ivan Amelio & Jean-Guy Rousset & Jacqueline Bloch & Aristide Lemaître & Alberto Amo & Anna Minguzzi & Iacopo Carusotto & Maxime Richard, 2019. "Dispersion relation of the collective excitations in a resonantly driven polariton fluid," Nature Communications, Nature, vol. 10(1), pages 1-8, December.
  • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-11886-3
    DOI: 10.1038/s41467-019-11886-3
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    Cited by:

    1. 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.
    2. 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.

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