Finite-temperature properties of the Hubbard chain with bond-charge interaction
Strongly Correlated Electrons
2009-11-07 v2 Statistical Mechanics
Abstract
We investigate the one-dimensional Hubbard model with an additional bond-charge interaction, recently considered in the description of compounds that exhibit strong 1D features above the temperature of ordered phases. The partition function of the model is exactly calculated for a value of the bond-charge coupling; the behavior of the specific heat and spin susceptibility as a function of temperature is derived at arbitrary filling, and particularly discussed across the occurring metal-insulator transition. The results show that the bond-charge terms weaken the spin excitations of the system.
Keywords
Cite
@article{arxiv.cond-mat/0201391,
title = {Finite-temperature properties of the Hubbard chain with bond-charge interaction},
author = {Fabrizio Dolcini and Arianna Montorsi},
journal= {arXiv preprint arXiv:cond-mat/0201391},
year = {2009}
}
Comments
5 pages, 3 eps figures