Spontaneous persistent currents in a quantum spin Hall insulator
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Título: | Spontaneous persistent currents in a quantum spin Hall insulator |
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Autor/es: | Soriano, David | Fernández-Rossier, Joaquín |
Grupo/s de investigación o GITE: | Grupo de Nanofísica |
Centro, Departamento o Servicio: | Universidad de Alicante. Departamento de Física Aplicada |
Palabras clave: | Persistent charge current | Quantum spin Hall insulators | Graphene |
Área/s de conocimiento: | Física de la Materia Condensada |
Fecha de publicación: | 7-oct-2010 |
Editor: | American Physical Society |
Cita bibliográfica: | SORIANO, D.; FERNÁNDEZ-ROSSIER, J. “Spontaneous persistent currents in a quantum spin Hall insulator”. Physical Review B. Vol. 82, No. 16 (2010). ISSN 1098-0121, pp. 161302(R)-1/4 |
Resumen: | We present a mechanism for persistent charge current. Quantum spin Hall insulators hold dissipationless spin currents in their edges so that, for a given spin orientation, a net charge current flows which is exactly compensated by the counterflow of the opposite spin. Here we show that ferromagnetic order in the edge upgrades the spin currents into persistent charge currents without applied fields. For that matter, we study the Hubbard model including Haldane-Kane-Mele spin-orbit coupling in a zigzag ribbon and consider the case of graphene. We find three electronic phases with magnetic edges that carry currents reaching 0.4 nA, comparable to persistent currents in metallic rings, for the small spin-orbit coupling in graphene. One of the phases is a valley half metal. |
Patrocinador/es: | This work has been financially supported by MEC-Spain (Grants No. MAT07-67845 and CONSOLIDER No. CSD2007-0010). |
URI: | http://hdl.handle.net/10045/25238 |
ISSN: | 1098-0121 (Print) | 1550-235X (Online) |
DOI: | 10.1103/PhysRevB.82.161302 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | © 2010 The American Physical Society |
Revisión científica: | si |
Versión del editor: | http://dx.doi.org/10.1103/PhysRevB.82.161302 |
Aparece en las colecciones: | INV - Grupo de Nanofísica - Artículos de Revistas |
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