A new model of a graphene---C60 composite is constructed to explore its electronic structure and field-emission characteristics. We investigate the structural stability, energy levels, local electron density distribution, work function, ionization potential, and Mulliken, Hirshfeld, and electrostatic potential fitting (ESP) charges of this composite by using first-principles methods. The results indicate that the electronic structure of the composite can be modulated obviously by applying an external electric field. The energy gap decreases as the electric field is increased, and the change in...
