Effects of band filling in the Anderson-Falicov-Kimball model
Autor(a) principal: | |
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Data de Publicação: | 2013 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/104559 |
Resumo: | In this work, we study the Anderson-Falicov-Kimball model within the dynamical mean field theory for the Bethe lattice, restricting our analysis to the nonmagnetic case. The one-particle density of states is obtained by both arithmetic and geometric averages over disorder, since only the latter can detect localization in the absence of an energy gap. Varying the strengths of Coulomb interaction and disorder at zero temperature, we construct phase diagrams for this model, where we distinguish spectral regions with localized states, with extended states, or with a correlation-induced gap. With this, we identify metal-insulator transitions driven by correlation and disorder, as well as the competition between these effects. This is done for various band fillings, since our main interest here is to study how the variation of the electron density affects the phase diagrams previously obtained for half-filling. The picture revealed by the density of states is further checked by evaluating the static and dynamic conductivities, including temperature effects. |
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Carvalho, Rubens Diego Barbosa deGusmao, Miguel Angelo Cavalheiro2014-10-15T02:12:38Z20131098-0121http://hdl.handle.net/10183/104559000900727In this work, we study the Anderson-Falicov-Kimball model within the dynamical mean field theory for the Bethe lattice, restricting our analysis to the nonmagnetic case. The one-particle density of states is obtained by both arithmetic and geometric averages over disorder, since only the latter can detect localization in the absence of an energy gap. Varying the strengths of Coulomb interaction and disorder at zero temperature, we construct phase diagrams for this model, where we distinguish spectral regions with localized states, with extended states, or with a correlation-induced gap. With this, we identify metal-insulator transitions driven by correlation and disorder, as well as the competition between these effects. This is done for various band fillings, since our main interest here is to study how the variation of the electron density affects the phase diagrams previously obtained for half-filling. The picture revealed by the density of states is further checked by evaluating the static and dynamic conductivities, including temperature effects.application/pdfengPhysical review. B, Condensed matter and materials physics. Woodbury. Vol. 87, no. 8 (Feb. 2013), 085122, 7 p.Modelo de AndersonDensidade de estados eletronicosIntervalo proibido de energiaDiagramas de faseEffects of band filling in the Anderson-Falicov-Kimball modelEstrangeiroinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSORIGINAL000900727.pdf000900727.pdfTexto completo (inglês)application/pdf877968http://www.lume.ufrgs.br/bitstream/10183/104559/1/000900727.pdf824ed40b3c400908aaf5d3670776a261MD51TEXT000900727.pdf.txt000900727.pdf.txtExtracted Texttext/plain30904http://www.lume.ufrgs.br/bitstream/10183/104559/2/000900727.pdf.txte406d0415f1ae50a6949f8a8906c6f6dMD52THUMBNAIL000900727.pdf.jpg000900727.pdf.jpgGenerated Thumbnailimage/jpeg2124http://www.lume.ufrgs.br/bitstream/10183/104559/3/000900727.pdf.jpg8f826159bf6c08034314e5effaaacc9fMD5310183/1045592018-10-10 08:12:27.356oai:www.lume.ufrgs.br:10183/104559Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2018-10-10T11:12:27Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Effects of band filling in the Anderson-Falicov-Kimball model |
title |
Effects of band filling in the Anderson-Falicov-Kimball model |
spellingShingle |
Effects of band filling in the Anderson-Falicov-Kimball model Carvalho, Rubens Diego Barbosa de Modelo de Anderson Densidade de estados eletronicos Intervalo proibido de energia Diagramas de fase |
title_short |
Effects of band filling in the Anderson-Falicov-Kimball model |
title_full |
Effects of band filling in the Anderson-Falicov-Kimball model |
title_fullStr |
Effects of band filling in the Anderson-Falicov-Kimball model |
title_full_unstemmed |
Effects of band filling in the Anderson-Falicov-Kimball model |
title_sort |
Effects of band filling in the Anderson-Falicov-Kimball model |
author |
Carvalho, Rubens Diego Barbosa de |
author_facet |
Carvalho, Rubens Diego Barbosa de Gusmao, Miguel Angelo Cavalheiro |
author_role |
author |
author2 |
Gusmao, Miguel Angelo Cavalheiro |
author2_role |
author |
dc.contributor.author.fl_str_mv |
Carvalho, Rubens Diego Barbosa de Gusmao, Miguel Angelo Cavalheiro |
dc.subject.por.fl_str_mv |
Modelo de Anderson Densidade de estados eletronicos Intervalo proibido de energia Diagramas de fase |
topic |
Modelo de Anderson Densidade de estados eletronicos Intervalo proibido de energia Diagramas de fase |
description |
In this work, we study the Anderson-Falicov-Kimball model within the dynamical mean field theory for the Bethe lattice, restricting our analysis to the nonmagnetic case. The one-particle density of states is obtained by both arithmetic and geometric averages over disorder, since only the latter can detect localization in the absence of an energy gap. Varying the strengths of Coulomb interaction and disorder at zero temperature, we construct phase diagrams for this model, where we distinguish spectral regions with localized states, with extended states, or with a correlation-induced gap. With this, we identify metal-insulator transitions driven by correlation and disorder, as well as the competition between these effects. This is done for various band fillings, since our main interest here is to study how the variation of the electron density affects the phase diagrams previously obtained for half-filling. The picture revealed by the density of states is further checked by evaluating the static and dynamic conductivities, including temperature effects. |
publishDate |
2013 |
dc.date.issued.fl_str_mv |
2013 |
dc.date.accessioned.fl_str_mv |
2014-10-15T02:12:38Z |
dc.type.driver.fl_str_mv |
Estrangeiro info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10183/104559 |
dc.identifier.issn.pt_BR.fl_str_mv |
1098-0121 |
dc.identifier.nrb.pt_BR.fl_str_mv |
000900727 |
identifier_str_mv |
1098-0121 000900727 |
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http://hdl.handle.net/10183/104559 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Physical review. B, Condensed matter and materials physics. Woodbury. Vol. 87, no. 8 (Feb. 2013), 085122, 7 p. |
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info:eu-repo/semantics/openAccess |
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openAccess |
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application/pdf |
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