Rights statement: ©2013 American Physical Society
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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Moire minibands in graphene heterostructures with almost commensurate sqrt3 x sqrt3 hexagonal crystals
AU - Wallbank, John
AU - Mucha Kruczynski, Marcin
AU - Falko, Vladimir
N1 - ©2013 American Physical Society
PY - 2013/10/14
Y1 - 2013/10/14
N2 - 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.
AB - 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.
U2 - 10.1103/PhysRevB.88.155415
DO - 10.1103/PhysRevB.88.155415
M3 - Journal article
VL - 88
JO - Physical review B
JF - Physical review B
SN - 1550-235X
IS - 15
M1 - 155415
ER -