Fig. 1. Top views of (a) ABC- and (b) ABA-stacked trilayer graphene, where green, red, and blue balls represent carbon atoms in the bottom, middle, and top layers, denoted by 1, 2, and 3, respectively. A and B denote carbon sublattices in each graphene layer that are colored by dark and light balls. Side views of (c) ABC- and (d) ABA-stacked trilayer graphene. Dashed arrows indicate tight-binding hopping parameters of trilayer graphene, denoted by γ0, γ 1, γ 3, and γ 4. Calculated electron band structure of (e) ABC- and (f) ABA-stacked trilayer graphene along the Γ-K-M direction using the tight-binding model.
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