Figure 1: Two examples of misoriented honeycomb lattices. | Nature

Figure 1: Two examples of misoriented honeycomb lattices.

From: Graphene moiré mystery solved?

Figure 1

a, The two lattices are overlaid at an angle of about 27.8°. The resulting atomic arrangement is precisely periodic, but has more atoms per period than has perfectly oriented (no rotation) Bernal stacking. b, Lattices rotated by 9°. Although the atomic arrangement never precisely repeats, there is a periodic pattern of points in space at which atoms from the two layers are nearly on top of each other, making the structure appear more open in this top view. When the local stacking arrangement varies slowly in space, electronic properties are insensitive to the atomic details that distinguish commensurate and nearby incommensurate rotation angles.

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