The Role of the Exchange Interaction in the One-Dimensional $n$-Component Hubbard Model
Strongly Correlated Electrons
2008-05-08 v1
Abstract
The commensurate -filled -component Hubbard chain was investigated by bosonization and high-precision density-matrix renormalization-group analysis. It was found that depending on the relation between the number of components , and the filling parameter , the system shows metallic or insulating behavior, and for special fillings bond-ordered (dimerized, trimerized, tetramerized etc.) ground state develops in the insulating phase. A mean-field analysis shows that this bond ordering is a direct consequence of the spin-exchange interaction, which plays a crucial role in the one-parameter Hubbard model -- not only for infinite Coulomb repulsion, but for intermediate values as well.
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Cite
@article{arxiv.0805.0982,
title = {The Role of the Exchange Interaction in the One-Dimensional $n$-Component Hubbard Model},
author = {E. Szirmai and Ö. Legeza and J. Sólyom},
journal= {arXiv preprint arXiv:0805.0982},
year = {2008}
}
Comments
3 pages