Figure 4.

(a) Band structure of graphene calculated with a tight-binding method with ${ϵ}_{2p}=0eV$, ${\gamma }_0=3.033eV$ and $s_0=0.129eV$. (b) Cross-section through the band structure, where the energy bands are plotted as a function of wave vector component $k_x$ along the line $k_y=0$.