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

Claire Mathieu 1 Edward H. Conrad 2 Feng Wang 3 Julien E. Rault 4 Vitaliy Feyer 5 Claus M. Schneider 6 Olivier Renault 7 Nick Barrett 8, 9
1 IDEDH - Institut de Droit Européen des Droits de l'Homme - EA 3976
2 Georgia Institute of Technology [Atlanta]
3 IPGS-GE - Géophysique expérimentale (IPGS)
IPGS - Institut de physique du globe de Strasbourg
4 SSOLEIL - Synchrotron SOLEIL
5 Peter Grünberg Institut
6 CLILLAC-ARP (EA_3967) - Centre de Linguistique Inter-langues, de Lexicologie, de Linguistique Anglaise et de Corpus
7 CEA-LETI - Laboratoire d'Electronique et des Technologies de l'Information
8 LENSIS - Laboratoire d'Etude des NanoStructures et Imagerie de Surface
SPEC - UMR3680 - Service de physique de l'état condensé, IRAMIS - Institut Rayonnement Matière de Saclay
9 SPEC - UMR3680 - Service de physique de l'état condensé
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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https://hal-cea.archives-ouvertes.fr/cea-01376753
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Submitted on : Wednesday, October 5, 2016 - 3:30:16 PM
Last modification on : Thursday, November 14, 2019 - 10:18:03 AM

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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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