title: Interactions and magnetism in graphene boundary states.
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 a function of the momentum parallel to the edge, induced by the interactions. Away from half filling the wave function 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.
authors.affiliation: Departamento de Física de Materiales, Universidad Complutense de Madrid, E-28040 Madrid, Spain and Instituto de Ciencia de Materiales de Madrid, CSIC, E-28049 Madrid, Spain.
authors.forename: B
authors.initials: B
authors.lastname: Wunsch
authors.forename: T
authors.initials: T
authors.lastname: Stauber
authors.forename: F
authors.initials: F
authors.lastname: Sols
authors.forename: F
authors.initials: F
authors.lastname: Guinea