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(a) The switching behavior as a function of bottom-gate voltage with various benzyl viologen doping amount in single bottom-gated bilayer graphene device. Energy band structure and doping schematics of of bilayer graphene with (b) top layer p-doped by oxygen, (c) top layer n-doped by benzyl viologen, (d) additional bottom layer n-doped by a positive bottom-gate voltage, and (e) additional bottom layer p-doped by a negative bottom-gate voltage.
