METAL-INSULATOR-TRANSITION IN 1D HUBBARD-MODEL

For the one-dimensional Hubbard model we extended the bosonization tec hnique, away from half filling, in such a way that a general formula i s obtained for the zero temperature single-particle Green function wit h validity over the whole doping range. Our method allows us to calcul ate, for the first time, the one-body Green function in both Tomonaga- Luttinger and Luther-Emery universality classes, to characterize the c rossover between these two behaviors and thus, to describe the metal-i nsulator transition. We have found that the transition can be characte rized as a Brinkman-Rice transition with a diverging effective mass.