Figure 1

(Color online) Bilayer of $AB$ stacked graphene with the four different sublattices indicated by different shades (colors). The A and ${\text{B}}^{\prime }$ sublattices are situated on top of each other as illustrated by the dotted lines. The carbon atoms at the corners of the light triangles indicate the six neighbors to be hydrogenated.Reuse & Permissions

Figure 2

(Color online) Formation of a chemical bond between the two layers in bilayer graphene in (a) a $2\times 2$, (b) a $4\times 4$, and [(c) and (d)] a $3\times 3$ supercell. The light colored atoms are H and the others C.Reuse & Permissions

Figure 3

(Color online) Hydrogenation of $2\times 2$ supercell of bilayer graphene. The formation energy per hydrogen atom is shown for increasing H concentration. The three curves show three different ways of distributing the H atoms: according to dimer configuration $a$ [inset (a)], $b$ [inset (b)], and by placing the H atoms only on sublattices B and ${\text{A}}^{\prime }$. Inset (c) shows the trimer configuration which is a combination of dimer $a$ and $b$. The curves of the two different dimer configurations are the same if the trimer is formed because the trimer is a combination of these two dimers.Reuse & Permissions

Figure 4

(Color online) Top (a) and side (b) view of a bilayer of graphane. The carbon atoms of the two layers are given different colors for clarity.Reuse & Permissions

Figure 5

(Color online) The electronic band structure of (a) monolayer and (b) bilayer graphane. The energies are relative to the Fermi level $\left(E_F=0\right)$.Reuse & Permissions