| dc.description |
So as to clearly understand the energy band gap of graphene, we study the energy band of tight-binding electrons on a honeycomb lattice with on-site potentials ε<sub>A</sub> and ε<sub>B</sub> on sublattices A and B, nearest-neighbor transfer integrals t<sub>a</sub>, t<sub>b</sub> and t<sub>c</sub>, and next-nearest-neighbor transfer integrals t<sub>2a</sub>, t<sub>2b</sub>, t<sub>2c</sub>, t<sub>2d</sub>, t<sub>2e</sub> and t<sub>2f</sub>, where t<sub>2a</sub>, t<sub>2b</sub> and t<sub>2C</sub> are transfer integrals between sublattice A, and t<sub>2d</sub>, t<sub>2e</sub> and t<sub>2f</sub> are transfer integrals between sublattice B. |
