  Van der Waals heterostructures of graphene and hexagonal boron nitride
feature a moir\'e superlattice for graphene's Dirac electrons. Here, we review
the effects generated by this superlattice, including a specific miniband
structure featuring gaps and secondary Dirac points, and a fractal spectrum of
magnetic minibands known as Hofstadter's butterfly.

Mesoscale and Nanoscale Physics