1201.5045 (E. Kogan et al.)

Symmetry classification of energy bands in graphene    [PDF]

E. Kogan, V. U. Nazarov

We present the results of the first principle calculations of the energy
bands in graphene and their symmetry classification. The valence bands and four
lowest conduction bands are classified according to their symmetry at the
points $\Gamma$ and $K$. The obtained results in general, and merging of the
bands at the points $\Gamma$ and $K$ in particular, are interpreted both in the
tight binding and nearly free electrons models. It is shown that in the
framework of the tight binding model merging of the $\pi$ and $\pi^*$ bands at
the point $K$ is obligatory.

View original: http://arxiv.org/abs/1201.5045