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

Claire Mathieu; Edward H. Conrad; Feng Wang; Julien E. Rault; Vitaliy Feyer; Claus M. Schneider; Olivier Renault; Nick Barrett

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.

Document type :

Journal articles

Domain :

Physics [physics]

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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 : Wednesday, July 31, 2019 - 3:24:02 PM

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

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

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