Intra-Landau-level magnetoexcitons and the transition between quantum Hall states in undoped bilayer graphene

Csaba Toke, Vladimir I. Fal'Ko

    Research output: Contribution to journalArticlepeer-review

    Abstract

    We study the collective modes of the quantum Hall states in undoped bilayer graphene in a strong perpendicular magnetic and electric field. Both for the well-known ferromagnetic state that is relevant for small electric field E and the analogous layer polarized one suitable for large E, the low-energy physics is dominated by magnetoexcitons with zero angular momentum that are even combinations of excitons that conserve Landau orbitals. We identify a long-wavelength instability in both states, and argue that there is an intermediate range of the electric field Ec(1)<E<Ec(2) where a gapless phase interpolates between the incompressible quantum Hall states. The experimental relevance of this crossover via a gapless state is discussed.

    Original languageEnglish
    Article number115455
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume83
    Issue number11
    DOIs
    Publication statusPublished - 29 Mar 2011

    Research Beacons, Institutes and Platforms

    • National Graphene Institute

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