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According to electronic structure theory, bilayer graphene is expected tohave anomalous electronic properties when it has long-period moir\'e patternsproduced by small misalignments between its individual layer honeycomblattices. We have realized bilayer graphene moir\'e crystals with accuratelycontrolled twist angles smaller than 1 degree and studied their propertiesusing scanning probe microscopy and electron transport. We observe conductivityminima at charge neutrality, satellite gaps that appear at anomalous carrierdensities for twist angles smaller than 1 degree, and tunnelingdensities-of-states that are strongly dependent on carrier density. Thesefeatures are robust up to large transverse electric fields. In perpendicularmagnetic fields, we observe the emergence of a Hofstadter butterfly in theenergy spectrum, with four-fold degenerate Landau levels, and broken symmetryquantum Hall states at filling factors 1, 2, 3. These observations demonstratethat at small twist angles, the electronic properties of bilayer graphenemoir\'e crystals are strongly altered by electron-electron interactions.

Tunable Moir\'e Bands and Strong Correlations in Small-Twist-Angle Bilayer Graphene