Ferromagnetism without flat bands in thin armchair nanoribbons
Strongly Correlated Electrons
2015-05-18 v1 Mesoscale and Nanoscale Physics
Abstract
Describing by a Hubbard type of model a thin armchair graphene ribbon in the armchair hexagon chain limit, one shows in exact terms, that even if the system does not have flat bands at all, at low concentration a mesoscopic sample can have ferromagnetic ground state, being metallic in the same time. The mechanism is connected to a common effect of correlations and confinement.
Cite
@article{arxiv.1005.2126,
title = {Ferromagnetism without flat bands in thin armchair nanoribbons},
author = {R. Trencsenyi and Z. Gulacsi},
journal= {arXiv preprint arXiv:1005.2126},
year = {2015}
}
Comments
37 pages, 12 figures, in press at Eur. Phys. Jour. B