Competition between spin exchange and correlated hopping

Details Competition between spin exchange and correlated hopping Competition between spin exchange and correlated hopping

2001-10-22

arxiv.org/abs/cond-mat/0110458v2

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages including 5 figures. Proceedings of ISSP-Kashiwa 2001 (submitted to J. Phys. Chem. Solids)

Scientific paper

10.1016/S0022-3697(02)00037-9

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.

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