Competition between spin and charge polarized states in nanographene ribbons with zigzag edges

Details Competition between spin and charge polarized states in nanographene ribbons with zigzag edges Competition between spin and charge polarized states in nanographene ribbons with zigzag edges

2003-09-26

arxiv.org/abs/cond-mat/0309600v1

Phys. Rev. B vol. 68, 193410 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages; 4 figures; accepted for publication in Phys. Rev. B; related Web site: http://staff.aist.go.jp/k.harigaya/index_E.htm

Scientific paper

10.1103/PhysRevB.68.193410

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.

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