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The energetic and electronic structure of bilayered graphene(BLG) with AA stacking arrangement on a SiO2 substrate is investigated in the presence of an electric field F of different intensities by ab initio density functional calculations.The AA-stacked bilayer graphene is stable on the SiO2 substrate in the absence of an electric field.However, as F increases, the AA-stacked bilayer graphenes are gradually shifted with each other and finally transfers into AB-stacked bilayer graphenes.The bandgap is accordingly changed.