Flat band ferromagnetism without connectivity conditions in the flat band
Strongly Correlated Electrons
2014-11-25 v1 Mesoscale and Nanoscale Physics
Soft Condensed Matter
Abstract
It is known that a system which exhibits a half filled lowest flat band and the localized one-particle Wannier states on the flat band satisfy the connectivity conditions, is always ferromagnetic. Without the connectivity conditions on the flat band, the system is non-magnetic. We show that this is not always true. The reason is connected to a peculiar behavior of the band situated just above the flat band.
Keywords
Cite
@article{arxiv.1411.6477,
title = {Flat band ferromagnetism without connectivity conditions in the flat band},
author = {Miklos Gulacsi and Gyorgy Kovacs and Zsolt Gulacsi},
journal= {arXiv preprint arXiv:1411.6477},
year = {2014}
}
Comments
15 pages, 4 figures