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Abstract: We study the influence of an external magnetic field h on the phase diagramof a system of Fermi particles living on the sites of a Bethe lattice withcoordination number z and interacting through on-site U and nearest-neighbor Vinteractions. This is a physical realization of the extended Hubbard model inthe narrow-band limit. Our results establish that the magnetic field maydramatically affect the critical temperature below which a long-range chargeordered phase is observed, as well as the behavior of physical quantities,inducing, for instance, magnetization plateaus in the magnetization curves.Relevant thermodynamic quantities - such as the specific heat and thesusceptibility - are also investigated at finite temperature by varying theon-site potential, the particle density and the magnetic field.



Autor: F. P. Mancini

Fuente: https://arxiv.org/







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