An extension of the cell-construction method for the flat-band ferromagnetism
Strongly Correlated Electrons
2020-08-26 v2
Abstract
We present an extension of the cell-construction method for the flat-band ferromagnetism. In a rather general setting, we construct Hubbard models with highly degenerate single-electron ground states and obtain a formal representation of these single-electron ground states. By our version of the cell-construction method, various types of flat-band Hubbard models, including the one on line graphs, can be designed and shown to have the unique ferromagnetic ground states when the electron number is equal to the degeneracy of the single-electron ground states.
Keywords
Cite
@article{arxiv.2004.07516,
title = {An extension of the cell-construction method for the flat-band ferromagnetism},
author = {Akinori Tanaka},
journal= {arXiv preprint arXiv:2004.07516},
year = {2020}
}
Comments
23 pages, 8 figures. Ver2: minor revision, typos corrected