Figure 2
From: Facile band gap tuning in graphene–brucite heterojunctions
Crystallographic relations between graphene, brucite and bruphene space groups. In the upper panel, the hexagonal/trigonal lattices of graphene (panel a, s.g. \(P\overline{6 }m2\)) and brucite Mg(OH)2 (panel c, s.g.\(P\overline{3 }m1\)) are shown, together with their common subgroup \(P3m1\) (panel b) that is the space group of brucite/graphene (“bruphene”) heterojunction. The graphs are projections along the [001] direction. White, red and yellow circles highlight high-symmetry (Wyckoff) sites, with their labels inside the shape. Note that sites with more than one letter (e.g., ‘a’ and ‘b’ in the circle) indicate Wyckoff positions at different heights (z fractional coordinate) in the crystallographic cell. In the lower panel, the three smallest, non-equivalent graphene/brucite (BG) models with \(P3m1\) symmetry, as viewed from the [001] direction. The blue dashed lines represent the unit cell of the heterojunction.
