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Moire minibands in graphene heterostructures with almost commensurate sqrt3 x sqrt3 hexagonal crystals

Research output: Contribution to journalJournal article

Published

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Journal publication date14/10/2013
JournalPhysical Review B
Journal number15
Volume88
Number of pages5
Original languageEnglish

Abstract

We present a phenomenological theory of the low energy moir\'e 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 Kekul\'e 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 moir\'e subband, asymmetrically in the conduction and valence bands.

Bibliographic note

©2013 American Physical Society