Modulated phases of graphene quantum Hall polariton fluids

Francesco M. D. Pellegrino (), Vittorio Giovannetti, Allan H. MacDonald and Marco Polini
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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

Nature Communications, 2016, vol. 7, issue 1, 1-9

Abstract: 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.

Date: 2016
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DOI: 10.1038/ncomms13355

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