Competition between spin and charge polarized states in nanographene ribbons with zigzag edges
Strongly Correlated Electrons
2007-05-23 v1 Soft Condensed Matter
Chemical Physics
Quantum Physics
Abstract
Effects of the nearest neighbor Coulomb interaction on nanographene ribbons with zigzag edges are investigated using the extended Hubbard model within the unrestricted Hartree-Fock approximation. The nearest Coulomb interaction stabilizes a novel electronic state with the opposite electric charges separated and localized along both edges, resulting in a finite electric dipole moment pointing from one edge to the other. This charge-polarized state competes with the peculiar spin-polarized state caused by the on-site Coulomb interaction and is stabilized by an external electric field.
Cite
@article{arxiv.cond-mat/0309600,
title = {Competition between spin and charge polarized states in nanographene ribbons with zigzag edges},
author = {Atsushi Yamashiro and Yukihiro Shimoi and Kikuo Harigaya and Katsunori Wakabayashi},
journal= {arXiv preprint arXiv:cond-mat/0309600},
year = {2007}
}
Comments
4 pages; 4 figures; accepted for publication in Phys. Rev. B; related Web site: http://staff.aist.go.jp/k.harigaya/index_E.html