Effective spinless fermions in the strong coupling Kondo model

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Starting from the two-orbital Kondo-lattice model with classical t_2g spins, an effective spinless fermion model is derived for strong Hund coupling J_H with a projection technique. The model is studied by Monte Carlo simulations and analytically using a uniform hopping approximation. The results for the spinless fermion model are in remarkable agreement with those of the original Kondo-lattice model, independent of the carrier concentration, and even for moderate Hund coupling J_H. Phase separation, the phase diagram in uniform hopping approximation, as well as spectral properties including the formation of a pseudo-gap are discussed for both the Kondo-lattice and the effective spinless fermion model in one and three dimensions.
Revtex4, 10 pages, 15 figures, typos corrected

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Strongly Correlated Electrons

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http://salesiana.dossiersoluciones.com/handle/123456789/19408

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0206049
 http://arxiv.org/abs/cond-mat/0206049
 Phys. Rev. B 66, 144425 (2002)
 doi:10.1103/PhysRevB.66.144425

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arXiv