Magnetism in graphene nanoislands
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Título: | Magnetism in graphene nanoislands |
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Autor/es: | Fernández-Rossier, Joaquín | Palacios Burgos, Juan José |
Grupo/s de investigación o GITE: | Grupo de Nanofísica |
Centro, Departamento o Servicio: | Universidad de Alicante. Departamento de Física Aplicada |
Palabras clave: | Magnetic properties | Graphene | Nanoislands | Zigzag edges |
Área/s de conocimiento: | Física de la Materia Condensada |
Fecha de publicación: | 26-oct-2007 |
Editor: | American Physical Society |
Cita bibliográfica: | FERNÁNDEZ-ROSSIER, J.; PALACIOS, J.J. “Magnetism in graphene nanoislands”. Physical Review Letters. Vol. 99, No. 17 (26 Oct. 2007). ISSN 0031-9007, pp. 177204-1/4 |
Resumen: | We study the magnetic properties of nanometer-sized graphene structures with triangular and hexagonal shapes terminated by zigzag 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 ≈1.5 nm. |
Patrocinador/es: | This work has been financially supported by MEC-Spain (Grant No. FIS200402356 and Ramon y Cajal Program), by Generalitat Valenciana (No. Accomp07-054), by Consolider No. CSD2007-0010 and, in part, by FEDER funds. |
URI: | http://hdl.handle.net/10045/25254 |
ISSN: | 0031-9007 (Print) | 1079-7114 (Online) |
DOI: | 10.1103/PhysRevLett.99.177204 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | © 2007 The American Physical Society |
Revisión científica: | si |
Versión del editor: | http://dx.doi.org/10.1103/PhysRevLett.99.177204 |
Aparece en las colecciones: | INV - Grupo de Nanofísica - Artículos de Revistas |
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