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Tuning field-induced energy gap of bilayer graphene via interlayer spacing
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View: Figures


Image of FIG. 1.
FIG. 1.

The valence and conduction band near the point of the Brillouin zone (shown in the upper-left panel) of the bilayer graphene with interlayer distances , 0.334, 0.37, 0.4, and in the presence of electric fields (a) 0, (b) 2, and (c) . The Fermi energy is set to zero. The insets in (b) and (c) show close-up views of the bands near at .

Image of FIG. 2.
FIG. 2.

(a) Variation of the energy gap with the electric field at different interlayer spacings . The gray line on the left side of the curves indicates a universal linear scaling of the gap at low fields (below ) with a slope of per V/nm for . (b) Variation of the energy gap with the interlayer spacing at different electric fields. The shaded/clear regions on the left/right side correspond to compression/expansion of the interlayer spacing from the equilibrium . The inset in (b) shows the variation of the force between the two graphene layers.

Image of FIG. 3.
FIG. 3.

Contour plots of the charge density difference (defined in text) at (a) 1 and (b) . The black dots denote the carbon atoms. The value and location of the largest charge density difference (in units of ) are shown in each panel. The contour step is set to be of the largest value in each case.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Tuning field-induced energy gap of bilayer graphene via interlayer spacing