Interactions and magnetism in graphene boundary states.
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.
Wunsch
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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.
Stauber
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Sols
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Guinea
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