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Modulated phases of graphene quantum Hall polariton fluids

Author

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  • Francesco M. D. Pellegrino

    (NEST, Scuola Normale Superiore and Istituto Nanoscienze-CNR)

  • Vittorio Giovannetti

    (NEST, Scuola Normale Superiore and Istituto Nanoscienze-CNR)

  • Allan H. MacDonald

    (University of Texas at Austin)

  • Marco Polini

    (Istituto Italiano di Tecnologia, Graphene Labs)

Abstract

There is a growing experimental interest in coupling cavity photons to the cyclotron resonance excitations of electron liquids in high-mobility semiconductor quantum wells or graphene sheets. These media offer unique platforms to carry out fundamental studies of exciton-polariton condensation and cavity quantum electrodynamics in a regime, in which electron–electron interactions are expected to play a pivotal role. Here, focusing on graphene, we present a theoretical study of the impact of electron–electron interactions on a quantum Hall polariton fluid, that is a fluid of magneto-excitons resonantly coupled to cavity photons. We show that electron–electron interactions are responsible for an instability of graphene integer quantum Hall polariton fluids towards a modulated phase. We demonstrate that this phase can be detected by measuring the collective excitation spectra, which is often at a characteristic wave vector of the order of the inverse magnetic length.

Suggested Citation

  • Francesco M. D. Pellegrino & Vittorio Giovannetti & Allan H. MacDonald & Marco Polini, 2016. "Modulated phases of graphene quantum Hall polariton fluids," Nature Communications, Nature, vol. 7(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms13355
    DOI: 10.1038/ncomms13355
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