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

Band and filling controlled transitions in exactly solved electronic models / Dolcini, Fabrizio; Montorsi, Arianna. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - STAMPA. - 63:12(2001), pp. 121103-1-121103-4. [10.1103/PhysRevB.63.121103]

Band and filling controlled transitions in exactly solved electronic models

DOLCINI, FABRIZIO;MONTORSI, Arianna
2001

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 Uc=6t; the second one is characterized by a filling-controlled metal-insulator transition between two finite regions of the diagram.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2303765
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