The edge states of the quantum Hall and fractional quantum Hall effect of atwo-dimensional electron gas provide key access to the excitations of the bulk.Here we demonstrate controlled transmission of edge states in bilayer graphene.Controlled by an independent gate, the backscattering rate of the edge modes iscontinuously tuned from 0 to close to 1, with fractional quantized valuescorresponding to the sequential complete backscattering of individual modes.Our experiments demonstrate the feasibility to controllably manipulate edgestates in bilayer graphene, thus opening the door to more complex experiments.
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