The Mott Metal-Insulator Transition
Exact solutions not only allow us to test our basic ideas, but also help to assess the quality of approxin~ate theories for correlated electron systems. In his view, a Motk insulator displays a gap for charge-carrying excitations due to electron cowelations, whose importance is expressed by the presence of local magnetic moments regardless of whether or not they are ordered. This book naturally embodies my own understanding of the phenomenon, inspired by the work of the late Sir Kevill Mott. For this purpose the Hubbard model and some of its derivatives are best suited.