11. They all have different energy band structures. 12. The size of this energy band gap serves as an arbitrary dividing line ( roughly 4 insulators. 13. The resulting probability of occupation of energy states in each energy band is given by Fermi Dirac statistics. 14. Graphene does not have an energy band -gap, which presents a hurdle for its applications in digital logic gates. 15. Free electrons are in the conduction band of energy levels, while holes are in the valence energy band . 16. InSb is a narrow-gap semiconductor with an energy band gap of 0.17 zincblende with a 0.648 nm lattice constant. 17. The energy of adjacent levels is so close together that they can be considered as a continuum, an energy band . 18. Despite Slade's reputation as one of the great high energy bands of their day, in this environment Slade had become irrelevant. 19. Electrons in bulk dielectric material ( larger than 10 nm ) can be described by energy bands or electron energy levels. 20. He used the k�p�perturbation method to determine what became known as the "'Kane model "'of the structure of energy bands of semiconductors.