Phase diagrams of half-filled 1D and 2D extended Hubbard model within COM

Details Phase diagrams of half-filled 1D and 2D extended Hubbard model within COM Phase diagrams of half-filled 1D and 2D extended Hubbard model within COM

2006-05-05

arxiv.org/abs/cond-mat/0605132v1

J. Phys. Chem. Sol. 67, 142 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1016/j.jpcs.2005.10.040

The half-filled extended Hubbard model, in one and two dimensions, is studied by means of the 2-pole approximation within the Composite Operator Method with the aim at 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.

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