Atomic structure and electronic density of states around the Fermi level in amorphous carbon models

Abstract

There are topologically determined energy levels concentrated around the Fermi level. Graph theory is used to estimate the density of states near the Fermi level ( E F ) of amorphous carbon ( a-C) structure. Within the ab initio Hartree-Fock calculations these states have lower energies than E F , but they remain the highest occupied states in the electronic density of states.