Interactions and magnetism in graphene boundary states
Strongly Correlated Electrons
2008-07-17 v1 Mesoscale and Nanoscale Physics
Abstract
We analyze interaction effects on boundary states of single layer graphene. Near a half filled band, both short and long-ranged interactions lead to a fully spin polarized configuration. In addition, the band of boundary states acquires a finite dispersion as function of the momentum parallel to the edge, induced by the interactions. Away from half filling the wavefunction develops charge correlations similar to those in a Wigner crystal, and the spin strongly alternates with the occupation of the boundary states. For certain fillings the ground state has a finite linear momentum, leading to the formation of persistent currents.
Cite
@article{arxiv.0803.1050,
title = {Interactions and magnetism in graphene boundary states},
author = {B. Wunsch and T. Stauber and F. Sols and F. Guinea},
journal= {arXiv preprint arXiv:0803.1050},
year = {2008}
}
Comments
5 pages, 4 figures