Flat-band ferromagnetism induced by off-site repulsions

Details Flat-band ferromagnetism induced by off-site repulsions Flat-band ferromagnetism induced by off-site repulsions

1998-01-23

arxiv.org/abs/cond-mat/9801242v1

Physics

Condensed Matter

4 pages, RevTex, 6 figures in Postscript, to be published in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.57.10609

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.

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