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

J. R. Wallbank, M Mucha-Kruczynski, V. I. Fal'ko

Research output: Contribution to journalArticle

19 Citations (Scopus)

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
Number of pages5
JournalPhysical Review B
Volume88
Issue number15
DOIs
Publication statusPublished - 14 Oct 2013

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