Magnetism in graphene nano-islands

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dc.creatorFernandez-Rossier, J.
dc.creatorPalacios, J. J.
dc.date2007-07-19
dc.date2007-10-30
dc.date.accessioned2026-07-07T08:39:01Z
dc.date.available2026-07-07T08:39:01Z
dc.descriptionWe study the magnetic properties of nanometer-sized graphene structures with triangular and hexagonal shapes terminated by zig-zag edges. We discuss how the shape of the island, the imbalance in the number of atoms belonging to the two graphene sublattices, the existence of zero-energy states, and the total and local magnetic moment are intimately related. We consider electronic interactions both in a mean-field approximation of the one-orbital Hubbard model and with density functional calculations. Both descriptions yield values for the ground state total spin, $S$, consistent with Lieb's theorem for bipartite lattices. Triangles have a finite $S$ for all sizes whereas hexagons have S=0 and develop local moments above a critical size of $\approx 1.5$ nm.
dc.descriptionPublished version
dc.identifierhttps://arxiv.org/abs/0707.2964
dc.identifierhttp://arxiv.org/abs/0707.2964
dc.identifierPhys. Rev. Lett. 99, 177204 (2007)
dc.identifierdoi:10.1103/PhysRevLett.99.177204
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/140934
dc.subjectMesoscale and Nanoscale Physics
dc.subjectStrongly Correlated Electrons
dc.titleMagnetism in graphene nano-islands
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