Data for: Unusual magnetotransport in twisted bilayer graphene

We present transport measurements of bilayer graphene with 1.38° interlayer twist and apparent
additional alignment to its hexagonal boron nitride cladding. As with other devices with twist
angles substantially larger than the magic angle of 1.1°, we do not observe correlated insulating
states or band reorganization. However, we do observe several highly unusual behaviors in magne-
totransport. For a large range of densities around half filling of the moire bands, magnetoresistance
is large and quadratic. Over these same densities, the magnetoresistance minima corresponding
to gaps between Landau levels split and bend as a function of density and field. We reproduce
the same splitting and bending behavior in a simple tight-binding model of Hofstadter’s butterfly
on a square lattice with anisotropic hopping terms. These features appear to be a generic class of
experimental manifestations of Hofstadter’s butterfly and may provide insight into the emergent
states of twisted bilayer graphene.