Coulomb Interactions and Ferromagnetism in Pure and Doped Graphene
Autor(a) principal: | |
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Data de Publicação: | 2005 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/1822/5179 |
Resumo: | We study the presence of ferromagnetism in the phase diagram of the two-dimensional honeycomb lattice close to half-filling (graphene) as a function of the strength of the Coulomb interaction and doping. We show that exchange interactions between Dirac fermions can stabilize a ferromagnetic phase at low doping when the coupling is sufficiently large. In clean systems the zero temperature phase diagram shows both first order and second order transition lines and two distinct ferromagnetic phases: one phase with only one type of carriers (either electrons or holes) and another with two types of carriers (electrons and holes). Using the coherent potential approximation we argue that disorder further stabilizes the ferromagnetic phase. This work should estimulate Monte Carlo calculations in graphene dealing with the long-range nature of the Coulomb potencial. |
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Coulomb Interactions and Ferromagnetism in Pure and Doped GrapheneScience & TechnologyWe study the presence of ferromagnetism in the phase diagram of the two-dimensional honeycomb lattice close to half-filling (graphene) as a function of the strength of the Coulomb interaction and doping. We show that exchange interactions between Dirac fermions can stabilize a ferromagnetic phase at low doping when the coupling is sufficiently large. In clean systems the zero temperature phase diagram shows both first order and second order transition lines and two distinct ferromagnetic phases: one phase with only one type of carriers (either electrons or holes) and another with two types of carriers (electrons and holes). Using the coherent potential approximation we argue that disorder further stabilizes the ferromagnetic phase. This work should estimulate Monte Carlo calculations in graphene dealing with the long-range nature of the Coulomb potencial.American Physical SocietyUniversidade do MinhoPeres, N. M. R.Guinea, F.Castro Neto, A. H.20052005-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/1822/5179eng"Physical Review B: Condensed Matter and Materials Physics". 72:174406 (2005)1098-01211550-235X10.1103/PhysRevB.72.174406http://prb.aps.org/info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-07-21T11:57:07ZPortal AgregadorONG |
dc.title.none.fl_str_mv |
Coulomb Interactions and Ferromagnetism in Pure and Doped Graphene |
title |
Coulomb Interactions and Ferromagnetism in Pure and Doped Graphene |
spellingShingle |
Coulomb Interactions and Ferromagnetism in Pure and Doped Graphene Peres, N. M. R. Science & Technology |
title_short |
Coulomb Interactions and Ferromagnetism in Pure and Doped Graphene |
title_full |
Coulomb Interactions and Ferromagnetism in Pure and Doped Graphene |
title_fullStr |
Coulomb Interactions and Ferromagnetism in Pure and Doped Graphene |
title_full_unstemmed |
Coulomb Interactions and Ferromagnetism in Pure and Doped Graphene |
title_sort |
Coulomb Interactions and Ferromagnetism in Pure and Doped Graphene |
author |
Peres, N. M. R. |
author_facet |
Peres, N. M. R. Guinea, F. Castro Neto, A. H. |
author_role |
author |
author2 |
Guinea, F. Castro Neto, A. H. |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
Universidade do Minho |
dc.contributor.author.fl_str_mv |
Peres, N. M. R. Guinea, F. Castro Neto, A. H. |
dc.subject.por.fl_str_mv |
Science & Technology |
topic |
Science & Technology |
description |
We study the presence of ferromagnetism in the phase diagram of the two-dimensional honeycomb lattice close to half-filling (graphene) as a function of the strength of the Coulomb interaction and doping. We show that exchange interactions between Dirac fermions can stabilize a ferromagnetic phase at low doping when the coupling is sufficiently large. In clean systems the zero temperature phase diagram shows both first order and second order transition lines and two distinct ferromagnetic phases: one phase with only one type of carriers (either electrons or holes) and another with two types of carriers (electrons and holes). Using the coherent potential approximation we argue that disorder further stabilizes the ferromagnetic phase. This work should estimulate Monte Carlo calculations in graphene dealing with the long-range nature of the Coulomb potencial. |
publishDate |
2005 |
dc.date.none.fl_str_mv |
2005 2005-01-01T00:00:00Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/1822/5179 |
url |
http://hdl.handle.net/1822/5179 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
"Physical Review B: Condensed Matter and Materials Physics". 72:174406 (2005) 1098-0121 1550-235X 10.1103/PhysRevB.72.174406 http://prb.aps.org/ |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
American Physical Society |
publisher.none.fl_str_mv |
American Physical Society |
dc.source.none.fl_str_mv |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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