Interplay between charge density wave and superconductivity in multiband systems with interband Coulomb interaction
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/235082 |
Resumo: | In this work we study the competition or coexistence between charge density wave (CDW) and superconductivity (SC) in a two-band model system in a square lattice. One of the bands has a net attractive interaction (Jd) that is responsible for SC. The model includes on-site Coulomb repulsion between quasiparticles in different bands (Udc) and the hybridization (V) between them. We are interested in describing intermetallic systems with a d-band of moderately correlated electrons, for which a mean-field approximation is adequate, coexisting with a large sp-band. For simplicity, all interactions and the hybridization V are considered site-independent. We obtain the eigenvalues of the Hamiltonian numerically and minimize the free energy density with respect to the relevant parameters to obtain the phase diagrams as function of Jd, Udc, V, band-filling (ntot), and the relative depth of the bands (εd0). We consider two types of superconducting ground states coexisting with the CDW. One is a homogeneous ground state and the other is a pair density wave where the SC order parameter has the same spatial modulation of the CDW. Our results show that the CDW and SC orders compete, but depending on the parameters of the model these phases may coexist. The model reproduces most of the experimental features of high dimensionality (d>1) metals with competing CDW and SC states, including the existence of first- and second-order phase transitions in their phase diagrams. |
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Silva Júnior, Nei Lopes daReyes, DanielContinentino, Mucio AmadoThomas, Christopher2022-02-12T04:51:49Z20211098-0121http://hdl.handle.net/10183/235082001130572In this work we study the competition or coexistence between charge density wave (CDW) and superconductivity (SC) in a two-band model system in a square lattice. One of the bands has a net attractive interaction (Jd) that is responsible for SC. The model includes on-site Coulomb repulsion between quasiparticles in different bands (Udc) and the hybridization (V) between them. We are interested in describing intermetallic systems with a d-band of moderately correlated electrons, for which a mean-field approximation is adequate, coexisting with a large sp-band. For simplicity, all interactions and the hybridization V are considered site-independent. We obtain the eigenvalues of the Hamiltonian numerically and minimize the free energy density with respect to the relevant parameters to obtain the phase diagrams as function of Jd, Udc, V, band-filling (ntot), and the relative depth of the bands (εd0). We consider two types of superconducting ground states coexisting with the CDW. One is a homogeneous ground state and the other is a pair density wave where the SC order parameter has the same spatial modulation of the CDW. Our results show that the CDW and SC orders compete, but depending on the parameters of the model these phases may coexist. The model reproduces most of the experimental features of high dimensionality (d>1) metals with competing CDW and SC states, including the existence of first- and second-order phase transitions in their phase diagrams.application/pdfengPhysical review. B, Condensed matter and materials physics. Woodbury. Vol. 103, no. 19 (May 2021), 195150, 10 p.SupercondutividadeOndas de densidade de cargaDiagrama de fasesInterplay between charge density wave and superconductivity in multiband systems with interband Coulomb interactionEstrangeiroinfo: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:UFRGSTEXT001130572.pdf.txt001130572.pdf.txtExtracted Texttext/plain52581http://www.lume.ufrgs.br/bitstream/10183/235082/2/001130572.pdf.txt10e52b3cb1556c40c2176c6a0cfe2e93MD52ORIGINAL001130572.pdfTexto completo (inglês)application/pdf1231101http://www.lume.ufrgs.br/bitstream/10183/235082/1/001130572.pdf93a0645eb2c43ba8c88ce2d99ce8345dMD5110183/2350822023-04-02 03:24:38.221337oai:www.lume.ufrgs.br:10183/235082Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-04-02T06:24:38Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Interplay between charge density wave and superconductivity in multiband systems with interband Coulomb interaction |
title |
Interplay between charge density wave and superconductivity in multiband systems with interband Coulomb interaction |
spellingShingle |
Interplay between charge density wave and superconductivity in multiband systems with interband Coulomb interaction Silva Júnior, Nei Lopes da Supercondutividade Ondas de densidade de carga Diagrama de fases |
title_short |
Interplay between charge density wave and superconductivity in multiband systems with interband Coulomb interaction |
title_full |
Interplay between charge density wave and superconductivity in multiband systems with interband Coulomb interaction |
title_fullStr |
Interplay between charge density wave and superconductivity in multiband systems with interband Coulomb interaction |
title_full_unstemmed |
Interplay between charge density wave and superconductivity in multiband systems with interband Coulomb interaction |
title_sort |
Interplay between charge density wave and superconductivity in multiband systems with interband Coulomb interaction |
author |
Silva Júnior, Nei Lopes da |
author_facet |
Silva Júnior, Nei Lopes da Reyes, Daniel Continentino, Mucio Amado Thomas, Christopher |
author_role |
author |
author2 |
Reyes, Daniel Continentino, Mucio Amado Thomas, Christopher |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Silva Júnior, Nei Lopes da Reyes, Daniel Continentino, Mucio Amado Thomas, Christopher |
dc.subject.por.fl_str_mv |
Supercondutividade Ondas de densidade de carga Diagrama de fases |
topic |
Supercondutividade Ondas de densidade de carga Diagrama de fases |
description |
In this work we study the competition or coexistence between charge density wave (CDW) and superconductivity (SC) in a two-band model system in a square lattice. One of the bands has a net attractive interaction (Jd) that is responsible for SC. The model includes on-site Coulomb repulsion between quasiparticles in different bands (Udc) and the hybridization (V) between them. We are interested in describing intermetallic systems with a d-band of moderately correlated electrons, for which a mean-field approximation is adequate, coexisting with a large sp-band. For simplicity, all interactions and the hybridization V are considered site-independent. We obtain the eigenvalues of the Hamiltonian numerically and minimize the free energy density with respect to the relevant parameters to obtain the phase diagrams as function of Jd, Udc, V, band-filling (ntot), and the relative depth of the bands (εd0). We consider two types of superconducting ground states coexisting with the CDW. One is a homogeneous ground state and the other is a pair density wave where the SC order parameter has the same spatial modulation of the CDW. Our results show that the CDW and SC orders compete, but depending on the parameters of the model these phases may coexist. The model reproduces most of the experimental features of high dimensionality (d>1) metals with competing CDW and SC states, including the existence of first- and second-order phase transitions in their phase diagrams. |
publishDate |
2021 |
dc.date.issued.fl_str_mv |
2021 |
dc.date.accessioned.fl_str_mv |
2022-02-12T04:51:49Z |
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/10183/235082 |
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1098-0121 |
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001130572 |
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1098-0121 001130572 |
url |
http://hdl.handle.net/10183/235082 |
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. 103, no. 19 (May 2021), 195150, 10 p. |
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info:eu-repo/semantics/openAccess |
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openAccess |
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