Band and filling controlled transitions in exactly solved electronic models

Details Band and filling controlled transitions in exactly solved electronic models Band and filling controlled transitions in exactly solved electronic models

2000-05-05

arxiv.org/abs/cond-mat/0005106v2

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, REVTEX, 2 eps figures

Scientific paper

10.1103/PhysRevB.63.121103

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 $U_c=6 t$; the second one is characterized by a filling-controlled metal-insulator transition between two finite regions of the diagram.

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