Approximate Treatment of a Two-Dimensional Anisotropic Peierls-Hubbard Model
Autor(a) principal: | |
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Data de Publicação: | 1993 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/103614 |
Resumo: | A Green-function formalism is presented to study a Peierls-Hubbard Hamiltonian in two dimensions. The 1attice consists of parallel dimerized chains with alternating nearest-neighbor hoppings t and t 11 and another hopping t 1 between different chains. The method treats the interdimer hopping as a perturbation and yields exact results in the uncorre1ated case and for isolated dimers. The calculated spectral functions exhibit a number of narrow subbands with typical low-dimensional singularities. The dependence of the gap at the Fermi levei on the electron-electron interaction U agrees qualitatively with the exact result in the known one-dimensional nondimerized limit. The paramagnetic susceptibility shows a maximum structure at low temperatures that is enhanced by U and by dimerization anda Curie-Weiss behavior at high temperatures. |
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Bernhard, Ben HurIglesias, Jose Roberto2014-09-23T02:12:20Z19930163-1829http://hdl.handle.net/10183/103614000056645A Green-function formalism is presented to study a Peierls-Hubbard Hamiltonian in two dimensions. The 1attice consists of parallel dimerized chains with alternating nearest-neighbor hoppings t and t 11 and another hopping t 1 between different chains. The method treats the interdimer hopping as a perturbation and yields exact results in the uncorre1ated case and for isolated dimers. The calculated spectral functions exhibit a number of narrow subbands with typical low-dimensional singularities. The dependence of the gap at the Fermi levei on the electron-electron interaction U agrees qualitatively with the exact result in the known one-dimensional nondimerized limit. The paramagnetic susceptibility shows a maximum structure at low temperatures that is enhanced by U and by dimerization anda Curie-Weiss behavior at high temperatures.application/pdfengPhysical review. B, Condensed matter. New York. Vol. 47, no. 19 (May 1993), p. 12408-12414Física da matéria condensadaModelo de hubbardMetodos de funcoes de greenMateria condensadaApproximate Treatment of a Two-Dimensional Anisotropic Peierls-Hubbard 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:UFRGSORIGINAL000056645.pdf000056645.pdfTexto completo (inglês)application/pdf731306http://www.lume.ufrgs.br/bitstream/10183/103614/1/000056645.pdf1bb19e24bd53118b09ca7fc3a53e115fMD51TEXT000056645.pdf.txt000056645.pdf.txtExtracted Texttext/plain23782http://www.lume.ufrgs.br/bitstream/10183/103614/2/000056645.pdf.txt774769933fa593c2bf4de0695acd8a1aMD52THUMBNAIL000056645.pdf.jpg000056645.pdf.jpgGenerated Thumbnailimage/jpeg1840http://www.lume.ufrgs.br/bitstream/10183/103614/3/000056645.pdf.jpgd43a54ff52f6841bc725418beb21f0f4MD5310183/1036142018-10-05 08:43:37.77oai:www.lume.ufrgs.br:10183/103614Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2018-10-05T11:43:37Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Approximate Treatment of a Two-Dimensional Anisotropic Peierls-Hubbard Model |
title |
Approximate Treatment of a Two-Dimensional Anisotropic Peierls-Hubbard Model |
spellingShingle |
Approximate Treatment of a Two-Dimensional Anisotropic Peierls-Hubbard Model Bernhard, Ben Hur Física da matéria condensada Modelo de hubbard Metodos de funcoes de green Materia condensada |
title_short |
Approximate Treatment of a Two-Dimensional Anisotropic Peierls-Hubbard Model |
title_full |
Approximate Treatment of a Two-Dimensional Anisotropic Peierls-Hubbard Model |
title_fullStr |
Approximate Treatment of a Two-Dimensional Anisotropic Peierls-Hubbard Model |
title_full_unstemmed |
Approximate Treatment of a Two-Dimensional Anisotropic Peierls-Hubbard Model |
title_sort |
Approximate Treatment of a Two-Dimensional Anisotropic Peierls-Hubbard Model |
author |
Bernhard, Ben Hur |
author_facet |
Bernhard, Ben Hur Iglesias, Jose Roberto |
author_role |
author |
author2 |
Iglesias, Jose Roberto |
author2_role |
author |
dc.contributor.author.fl_str_mv |
Bernhard, Ben Hur Iglesias, Jose Roberto |
dc.subject.por.fl_str_mv |
Física da matéria condensada Modelo de hubbard Metodos de funcoes de green Materia condensada |
topic |
Física da matéria condensada Modelo de hubbard Metodos de funcoes de green Materia condensada |
description |
A Green-function formalism is presented to study a Peierls-Hubbard Hamiltonian in two dimensions. The 1attice consists of parallel dimerized chains with alternating nearest-neighbor hoppings t and t 11 and another hopping t 1 between different chains. The method treats the interdimer hopping as a perturbation and yields exact results in the uncorre1ated case and for isolated dimers. The calculated spectral functions exhibit a number of narrow subbands with typical low-dimensional singularities. The dependence of the gap at the Fermi levei on the electron-electron interaction U agrees qualitatively with the exact result in the known one-dimensional nondimerized limit. The paramagnetic susceptibility shows a maximum structure at low temperatures that is enhanced by U and by dimerization anda Curie-Weiss behavior at high temperatures. |
publishDate |
1993 |
dc.date.issued.fl_str_mv |
1993 |
dc.date.accessioned.fl_str_mv |
2014-09-23T02:12:20Z |
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/10183/103614 |
dc.identifier.issn.pt_BR.fl_str_mv |
0163-1829 |
dc.identifier.nrb.pt_BR.fl_str_mv |
000056645 |
identifier_str_mv |
0163-1829 000056645 |
url |
http://hdl.handle.net/10183/103614 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Physical review. B, Condensed matter. New York. Vol. 47, no. 19 (May 1993), p. 12408-12414 |
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info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
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application/pdf |
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