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Observation of an Electric-Field-Induced Band Gap in Bilayer Graphene by Infrared Spectroscopy
It has been predicted that application of a strong electric field perpendicular to the plane of bilayer graphene can induce a significant band gap. We have measured the optical conductivity of bilayer graphene with an efficient electrolyte top gate for a photon energy range of 0.2--0.7 eV. We see the …