Exploring interlayer Dirac cone coupling in commensurately rotated few-layer graphene on SiC(000-1)

Abstract : We investigate electronic band-structure images in reciprocal space of few-layer graphene epitaxially grown on SiC(000-1). In addition to the observation of commensurate rotation angles of the graphene layers, the k-space images recorded near the Fermi edge highlight structures originating from diffraction of the Dirac cones due to the relative rotation of adjacent layers. The 21.9° and 27° rotation angles between two sheets of graphene are responsible for a periodic pattern that can be described with a superlattice unit cells. The superlattice generates replicas of Dirac cones with smaller wave vectors, because of a Brillouin zone folding. Copyright © 2014 John Wiley & Sons, Ltd.
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Claire Mathieu, Edward H. Conrad, Feng Wang, Julien E. Rault, Vitaliy Feyer, et al.. Exploring interlayer Dirac cone coupling in commensurately rotated few-layer graphene on SiC(000-1). Surface and Interface Analysis, Wiley-Blackwell, 2014, 46 (12-13), pp.1268 - 1272. ⟨10.1002/sia.5541⟩. ⟨cea-01376753⟩

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