Flat-band ferromagnetism induced by off-site repulsions
arXiv:cond-mat/9801242 · doi:10.1103/PhysRevB.57.10609
Abstract
Density matrix renormalization group method is used to analyze how the nearest-neighbor repulsion V added to the Hubbard model on 1D triangular lattice and a railway trestle (t-t') model will affect the electron-correlation dominated ferromagnetism arising from the interference (frustration). Obtained phase diagram shows that there is a region in smaller-t' side where the critical on-site repulsion above which the system becomes ferromagnetic is reduced when the off-site repulsion is introduced.
4 pages, RevTex, 6 figures in Postscript, to be published in Phys. Rev. B
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