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- Title
Different orderings in the narrow-band limit of the extended Hubbard model on the Bethe lattice.
- Authors
Mancini, F.; Mancini, F. P.
- Abstract
We present the exact solution of a system of Fermi particles living on the sites of a Bethe lattice with coordination number z and interacting through on-site U and nearest-neighbor V interactions. This is a physical realization of the extended Hubbard model in the atomic limit. Within the Green’s function and equations of motion formalism, we provide a comprehensive analysis of the model and we study the phase diagram at finite temperature in the whole model’s parameter space, allowing for the on-site and nearest-neighbor interactions to be either repulsive or attractive. We find the existence of critical regions where charge ordering (V > 0) and phase separation (V < 0) are observed. This scenario is endorsed by the study of several thermodynamic quantities.
- Subjects
FERMIONS; PARTICLES; THERMODYNAMICS; GREEN'S functions; LATTICE theory
- Publication
European Physical Journal B: Condensed Matter, 2010, Vol 73, Issue 4, p581
- ISSN
1434-6028
- Publication type
Article
- DOI
10.1140/epjb/e2010-00031-8