Graphene flakes placed on hexagonal boron nitride feature in the presence of
a magnetic field a complex electronic structure due to a hexagonal moir\'e
potential resulting from the van der Waals interaction with the substrate. The
slight lattice mismatch gives rise to a periodic supercell potential. Zone
folding is expected to create replica of the original Dirac cone and Hofstadter
butterflies. Our large-scale tight binding simulation reveals an unexpected
coexistence of a relativistic and non-relativistic Landau level structure. The
presence of the zeroth Landau level and its associated butterfly is shown to be
the unambiguous signature for the occurrence of Dirac cone replica.Comment: 8 pages, 6 figure
