Flat-band ferromagnetism induced by off-site repulsions
Condensed Matter
2009-10-31 v1
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.
Keywords
Cite
@article{arxiv.cond-mat/9801242,
title = {Flat-band ferromagnetism induced by off-site repulsions},
author = {Ryotaro Arita and Yukihiro Shimoi and Kazuhiko Kuroki and Hideo Aoki},
journal= {arXiv preprint arXiv:cond-mat/9801242},
year = {2009}
}
Comments
4 pages, RevTex, 6 figures in Postscript, to be published in Phys. Rev. B