Ferromagnetism in the Hubbard model with long-range and correlated hopping
arXiv:cond-mat/0312486 · doi:10.1007/s10582-004-0110-7
Abstract
The extrapolation of small-cluster exact-diagonalization calculations is used to examine ferromagnetism in the one-dimensional Hubbard model with long-range and correlated hopping. It is found that the correlated hopping term stabilizes the ferromagnetic state for a wide range of electron interactions and electron concentrations . The critical value of the interaction strength above which the ferromagnetic state becomes stable is calculated numerically and the ground-state phase diagram of the model is presented for physically the most interesting cases.
8 pages, 2 figures, latex