The half-filled extended Hubbard model, in one and two dimensions, is studied by means of the two-pole approximation within the Composite Operator Method with the aim of improving the possibilities to describe some of the experimental features observed for quasi-1D organic superconductors and Cu-O planes of cuprates. The phase diagrams (T-V and V-U) are analyzed with respect to the paramagnetic metal - paramagnetic insulator - charge ordered phase transitions. The relevant features of the diagrams (rank of the phase transitions, critical points, reentrant behavior) are discussed in detail. © 2005 Elsevier Ltd. All rights reserved.
Phase diagrams of half-filled 1D and 2D extended Hubbard model within COM
AVELLA, Adolfo;MANCINI, Ferdinando
2006-01-01
Abstract
The half-filled extended Hubbard model, in one and two dimensions, is studied by means of the two-pole approximation within the Composite Operator Method with the aim of improving the possibilities to describe some of the experimental features observed for quasi-1D organic superconductors and Cu-O planes of cuprates. The phase diagrams (T-V and V-U) are analyzed with respect to the paramagnetic metal - paramagnetic insulator - charge ordered phase transitions. The relevant features of the diagrams (rank of the phase transitions, critical points, reentrant behavior) are discussed in detail. © 2005 Elsevier Ltd. All rights reserved.File in questo prodotto:
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