(left) Preparation of N-graphene samples; (right) ARPES of N-graphene/Au/Ni(111)/W(110), measured at the photon energy of 35 eV, through the K-point, few degrees off the direction, perpendicular to the ΓK. The Dirac cone is shifted by ~0.3 eV toward higher binding energies with respect to the π-band of undoped graphene/Au/Ni(111)/W(110), which has Dirac point directly at (or slightly above) the EF, and a band gap of ~0.2 eV appears at the K-point.
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