Effective spinless fermions in the strong coupling Kondo model
Abstract
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.
Cite
@article{arxiv.cond-mat/0206049,
title = {Effective spinless fermions in the strong coupling Kondo model},
author = {Winfried Koller and Alexander Pruell and Hans Gerd Evertz and Wolfgang von der Linden},
journal= {arXiv preprint arXiv:cond-mat/0206049},
year = {2007}
}
Comments
Revtex4, 10 pages, 15 figures, typos corrected