Peculiarities of interaction of the p(z)-, pi- electrons and the sigma(p)-holes at the top 1-6 layers of HOPG

摘要

The present work continues the analysis of results of Dementjev et al. (2015) in order to identify the interlayer interactions of the pi-bands. Analysis of the N(E) C KVV Auger spectra of highly-ordered pyrographite showed the absence of the electron exchange between the pi-bands in 1-6 layers. Since the pi-bands are formed by the p(z) -> pi transitions, one can suggest that the pi-band occupation at each graphene layer is formed by the p(z)-electrons of this layer. Since the p(z), electrons belong to the sigma(p)-bands, the p(z) -> pi transitions in the sigma(p-)bands in each of 2-6 graphene layers result in formation of holes H, whose concentration is equal to the concentration of electrons in the pi-bands [H-i] [pi(i)]. This shows the origin of the ambipolar conductivity in graphene.