Graphene Bandgaps (IMAGE)

DOE/Lawrence Berkeley National Laboratory

Graphene Bandgaps

Caption

One of the most unusual features of single-layer graphene (top) is that its conical conduction and valence bands meet at a point -- it has no bandgap. Symmetrical bilayer graphene (middle) also lacks a bandgap. Electrical fields (arrows) introduce asymmetry into the bilayer structure (bottom), yielding a bandgap (Δ) that can be selectively tuned.

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Lawrence Berkeley National Laboratory

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