Figure 32.

(A) Graphene has two hexagonal sublattices (A and B) in its honeycomb structure with translation vectors a₁ and a₂. (B) The Brillouin zone is hexagonal with two symmetry inequivalent corners labeled K and K′. (C) Near the Dirac points at K and K′, the dispersion is linear. The band structure is computed at the PBE level and taken from the Computational 2D Materials Database (Haastrup et al., 2018) with Fermi energy set to zero.