Moiré minibands in graphene heterostructures with almost commensurate √3×√3 hexagonal crystals

J. R. Wallbank, M. Mucha-Kruczyński, V. I. Fal'Ko

    Research output: Contribution to journalArticlepeer-review

    Abstract

    We present a phenomenological theory of the low-energy moiré minibands of Dirac electrons in graphene placed on an almost commensurate hexagonal underlay with a unit cell approximately three times larger than that of graphene. A slight incommensurability results in a periodically modulated intervalley scattering for electrons in graphene. In contrast to the perfectly commensurate Kekulé distortion of graphene, such superlattice perturbation leaves the zero-energy Dirac cones intact, but is able to open a band gap at the edge of the first moiré subbands, asymmetrically in the conduction and valence bands.

    Original languageEnglish
    Article number155415
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume88
    Issue number15
    DOIs
    Publication statusPublished - 14 Oct 2013

    Research Beacons, Institutes and Platforms

    • National Graphene Institute

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