Competition between spin exchange and correlated hopping
Abstract
The ground-state phase diagram is numerically studied for an electronic model consisting of the spin exchange term (J) and the correlated hopping term (t_3: the three-site term). This model has no single-particle hopping and the ratio of the two terms is controlled by a parameter \alpha \equiv 4 t_3 / J. The case of \alpha=1 corresponds to complete suppression of single-particle hopping in the strong-coupling limit of the Hubbard model. In one dimension, phase separation takes place below a critical value \alpha_c = 0.36-0.63 which depends on the electron density. Spin gap opens in the whole region except the phase-separated one. For \alpha \gsim 1.2 and low hole densities, charge-density-wave correlations are the most dominant, whereas singlet-pairing correlations are the most dominant in the remaining region. The possibility of superconductivity in the two-dimensional case is also discussed, based on equal-time pairing correlations.
Cite
@article{arxiv.cond-mat/0110458,
title = {Competition between spin exchange and correlated hopping},
author = {Y. Saiga and M. Imada},
journal= {arXiv preprint arXiv:cond-mat/0110458},
year = {2009}
}
Comments
4 pages including 5 figures. Proceedings of ISSP-Kashiwa 2001 (submitted to J. Phys. Chem. Solids)