A modified form of the polar model of crystals
Abstract
Description
A model for description of materials with narrow energy bands is proposed. It is shown that in narrow-band materials electron-hole symmetry is absent in contrast to the Hubbard model. In this paper metal-insulator transition is studied. The obtained results are compared with experimental data for narrow-band materials. Some specific narrow-band effects are discussed.
17 pages, 4 eps figures, Latex 2.09
17 pages, 4 eps figures, Latex 2.09