Observation of multi Dirac fermion cloning induced by moir\'e potential in graphene-SiC heterostructure

We reexamine the electronic structure of graphene on SiC substrate by angle-resolved photoemission spectroscopy. We directly observed multiply cloning of Dirac cone, in addition to ones previously attributed to reconstruction. The locations, relative distances and anisotropy of Dirac cone replicas fully agree with the moir'e pattern of graphene-SiC heterostructure. Our results provide a straightforward example of moir'e potential modulation in engineering electronic structure with Dirac fermions.