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

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.