Prediction of hidden multiferroic order in graphene zigzag ribbons
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Title: | Prediction of hidden multiferroic order in graphene zigzag ribbons |
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Authors: | Fernández-Rossier, Joaquín |
Research Group/s: | Grupo de Nanofísica |
Center, Department or Service: | Universidad de Alicante. Departamento de Física Aplicada |
Keywords: | Electronic structure | Hidden multiferroic order | Graphene ribbons | Zigzag edges |
Knowledge Area: | Física de la Materia Condensada |
Issue Date: | 27-Feb-2008 |
Publisher: | American Physical Society |
Citation: | FERNÁNDEZ-ROSSIER, J. “Prediction of hidden multiferroic order in graphene zigzag ribbons”. Physical Review B. Vol. 77, No. 7 (2008). ISSN 1098-0121, pp. 075430-1/5 |
Abstract: | An electronic phase with coexisting magnetic and ferroelectric order is predicted for graphene ribbons with zigzag edges. The electronic structure of the system is described with a mean-field Hubbard model that yields results very similar to those of density functional calculations. Without further approximations, the mean-field theory is recasted in terms of a BCS wave function for electron-hole pairs in the edge bands. The BCS coherence present in each spin channel is related to spin-resolved electric polarization. Although the total electric polarization vanishes, due to an internal phase locking of the BCS state, strong magnetoelectric effects are expected in this system. The formulation naturally accounts for the two gaps in the quasiparticle spectrun, Δ0 and Δ1, and relates them to the intraband and interband self-energies. |
Sponsor: | This work has been financially supported by MEC-Spain (Grant No. MAT2007-65487 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/10045/25230 |
ISSN: | 1098-0121 (Print) | 1550-235X (Online) |
DOI: | 10.1103/PhysRevB.77.075430 |
Language: | eng |
Type: | info:eu-repo/semantics/article |
Rights: | © 2008 The American Physical Society |
Peer Review: | si |
Publisher version: | http://dx.doi.org/10.1103/PhysRevB.77.075430 |
Appears in Collections: | INV - Grupo de Nanofísica - Artículos de Revistas |
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2008_PhysRevB.77.075430.pdf | 359,49 kB | Adobe PDF | Open Preview | |
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