Berry phase 2π quasiparticles, Landau level degeneracy and quantum Hall effect in a bilayer of graphene

Edward McCann, Vladimir I. Fal'ko

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The low energy electronic states of bilayer graphene correspond to chiral quasiparticles with a parabolic dispersion and Berry phase 2π in the vicinity of two inequivalent valleys. At high magnetic field, the Landau level spectrum consists of almost equidistant groups of spin and valley degenerate states at finite energy with eight degenerate states at zero energy. Thus, the carrier density dependence of the Hall conductivity exhibits plateaus at integer values of 4e2/h and has a step of 8e2/h across zero density.
    Original languageEnglish
    Pages (from-to)617-618
    Number of pages2
    JournalAIP Conference Proceedings
    Volume893
    DOIs
    Publication statusPublished - 1 Dec 2007

    Keywords

    • Berry phase
    • Graphene
    • Quantum Hall effect

    Research Beacons, Institutes and Platforms

    • National Graphene Institute

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