▎ 摘　　要

We report the first experimental study of continuous sheets of graphene possessing both one-layer and two-layer portions. In a bulk hybrid structure featuring two large-area one-layer and two-layer graphene areas, our measurements in a magnetic field revealed the formation of two independent sets of Landau levels with drastically different energy scales and level spacings as expected as well as new features in the quantum oscillation originating from the interface and device configuration. In edge hybrids featuring large two-layer graphene with two narrow one-layer graphene edges, we observed an anomalous suppression in the amplitude of the quantum oscillation of two-layer graphene. The suppression is interpreted as a consequence of the locking of the one-layer and two-layer graphene Fermi energies, the associated charge imbalance, and the emergence of chiral interface states, whose physical consequences are yet to be fully understood.