Band and filling controlled transitions in exactly solved electronic models

Abstract

We describe a general method to study the ground state phase diagram of electronic models on chains whose extended Hubbard hamiltonian is formed by a generalized permutator plus a band-controlling term. The method, based on the appropriate interpretation of Sutherland's species, yields under described conditions a reduction of the effective Hilbert space. In particular, we derive the phase diagrams of two new models; the first one exhibits a band-controlled insulator-superconductor transition at half-filling for the unusually high value $U_c=6t$; the second one is characterized by a filling-controlled metal-insulator transition between two finite regions of the diagram.

5 pages, REVTEX, 2 eps figures

References in corpus (1)

• Superconductivity in the Hubbard model with pair hopping

Cited by in corpus (8)

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