Transition between SU(4) and SU(2) Kondo effect

Autores
Tosi, Leandro; Roura Bas, Pablo Gines; Aligia, Armando Angel
Año de publicación
2012
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Motivated by experiments in nanoscopic systems, we study a generalized Anderson, which consist of two spin degenerate doublets hybridized to a singlet by the promotion of an electron to two conduction bands, as a function of the energy separation d between both doublets. For d¼0 or very large, the model is equivalent to a one-level SU(N) Anderson model, with N¼4 and 2 respectively. We study the evolution of the spectral density for both doublets (r 1s ðoÞ and r 2s ðoÞ) and their width in the Kondo limit as d is varied, using the non-crossing approximation (NCA). As d increases, the peak at the Fermi energy in the spectral density (Kondo peak) splits and the density of the doublet of higher energy r 2s ðoÞ shifts above the Ferrmi energy. The Kondo temperature T K (determined by the half-width at half maximum of the Kondo peak in density of the doublet of lower energy r 1s ðoÞ) decreases dramatically. The variation of T K with d is reproduced by a simple variational calculation.
Fil: Tosi, Leandro. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro. Archivo Histórico del Centro Atómico Bariloche e Instituto Balseiro | Universidad Nacional de Cuyo. Instituto Balseiro. Archivo Histórico del Centro Atómico Bariloche e Instituto Balseiro; Argentina
Fil: Roura Bas, Pablo Gines. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Aligia, Armando Angel. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro. Archivo Histórico del Centro Atómico Bariloche e Instituto Balseiro | Universidad Nacional de Cuyo. Instituto Balseiro. Archivo Histórico del Centro Atómico Bariloche e Instituto Balseiro; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Materia
ANDERSON MODEL
KONDO TEMPERATURE
NON-CROSSING APPROXIMATION
SPECTRAL DENSITY
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/196930
Acceder
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repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Transition between SU(4) and SU(2) Kondo effectTosi, LeandroRoura Bas, Pablo GinesAligia, Armando AngelANDERSON MODELKONDO TEMPERATURENON-CROSSING APPROXIMATIONSPECTRAL DENSITYhttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1Motivated by experiments in nanoscopic systems, we study a generalized Anderson, which consist of two spin degenerate doublets hybridized to a singlet by the promotion of an electron to two conduction bands, as a function of the energy separation d between both doublets. For d¼0 or very large, the model is equivalent to a one-level SU(N) Anderson model, with N¼4 and 2 respectively. We study the evolution of the spectral density for both doublets (r 1s ðoÞ and r 2s ðoÞ) and their width in the Kondo limit as d is varied, using the non-crossing approximation (NCA). As d increases, the peak at the Fermi energy in the spectral density (Kondo peak) splits and the density of the doublet of higher energy r 2s ðoÞ shifts above the Ferrmi energy. The Kondo temperature T K (determined by the half-width at half maximum of the Kondo peak in density of the doublet of lower energy r 1s ðoÞ) decreases dramatically. The variation of T K with d is reproduced by a simple variational calculation.Fil: Tosi, Leandro. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro. Archivo Histórico del Centro Atómico Bariloche e Instituto Balseiro | Universidad Nacional de Cuyo. Instituto Balseiro. Archivo Histórico del Centro Atómico Bariloche e Instituto Balseiro; ArgentinaFil: Roura Bas, Pablo Gines. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Aligia, Armando Angel. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro. Archivo Histórico del Centro Atómico Bariloche e Instituto Balseiro | Universidad Nacional de Cuyo. Instituto Balseiro. Archivo Histórico del Centro Atómico Bariloche e Instituto Balseiro; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaElsevier Science2012-08info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/196930Tosi, Leandro; Roura Bas, Pablo Gines; Aligia, Armando Angel; Transition between SU(4) and SU(2) Kondo effect; Elsevier Science; Physica B: Condensed Matter; 407; 16; 8-2012; 3259-32620921-4526CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0921452611012749#info:eu-repo/semantics/altIdentifier/doi/10.1016/j.physb.2011.12.081info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:32:26Zoai:ri.conicet.gov.ar:11336/196930instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 09:32:26.286CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Transition between SU(4) and SU(2) Kondo effect
title Transition between SU(4) and SU(2) Kondo effect
spellingShingle Transition between SU(4) and SU(2) Kondo effect
Tosi, Leandro
ANDERSON MODEL
KONDO TEMPERATURE
NON-CROSSING APPROXIMATION
SPECTRAL DENSITY
title_short Transition between SU(4) and SU(2) Kondo effect
title_full Transition between SU(4) and SU(2) Kondo effect
title_fullStr Transition between SU(4) and SU(2) Kondo effect
title_full_unstemmed Transition between SU(4) and SU(2) Kondo effect
title_sort Transition between SU(4) and SU(2) Kondo effect
dc.creator.none.fl_str_mv Tosi, Leandro
Roura Bas, Pablo Gines
Aligia, Armando Angel
author Tosi, Leandro
author_facet Tosi, Leandro
Roura Bas, Pablo Gines
Aligia, Armando Angel
author_role author
author2 Roura Bas, Pablo Gines
Aligia, Armando Angel
author2_role author
author
dc.subject.none.fl_str_mv ANDERSON MODEL
KONDO TEMPERATURE
NON-CROSSING APPROXIMATION
SPECTRAL DENSITY
topic ANDERSON MODEL
KONDO TEMPERATURE
NON-CROSSING APPROXIMATION
SPECTRAL DENSITY
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Motivated by experiments in nanoscopic systems, we study a generalized Anderson, which consist of two spin degenerate doublets hybridized to a singlet by the promotion of an electron to two conduction bands, as a function of the energy separation d between both doublets. For d¼0 or very large, the model is equivalent to a one-level SU(N) Anderson model, with N¼4 and 2 respectively. We study the evolution of the spectral density for both doublets (r 1s ðoÞ and r 2s ðoÞ) and their width in the Kondo limit as d is varied, using the non-crossing approximation (NCA). As d increases, the peak at the Fermi energy in the spectral density (Kondo peak) splits and the density of the doublet of higher energy r 2s ðoÞ shifts above the Ferrmi energy. The Kondo temperature T K (determined by the half-width at half maximum of the Kondo peak in density of the doublet of lower energy r 1s ðoÞ) decreases dramatically. The variation of T K with d is reproduced by a simple variational calculation.
Fil: Tosi, Leandro. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro. Archivo Histórico del Centro Atómico Bariloche e Instituto Balseiro | Universidad Nacional de Cuyo. Instituto Balseiro. Archivo Histórico del Centro Atómico Bariloche e Instituto Balseiro; Argentina
Fil: Roura Bas, Pablo Gines. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Aligia, Armando Angel. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro. Archivo Histórico del Centro Atómico Bariloche e Instituto Balseiro | Universidad Nacional de Cuyo. Instituto Balseiro. Archivo Histórico del Centro Atómico Bariloche e Instituto Balseiro; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
description Motivated by experiments in nanoscopic systems, we study a generalized Anderson, which consist of two spin degenerate doublets hybridized to a singlet by the promotion of an electron to two conduction bands, as a function of the energy separation d between both doublets. For d¼0 or very large, the model is equivalent to a one-level SU(N) Anderson model, with N¼4 and 2 respectively. We study the evolution of the spectral density for both doublets (r 1s ðoÞ and r 2s ðoÞ) and their width in the Kondo limit as d is varied, using the non-crossing approximation (NCA). As d increases, the peak at the Fermi energy in the spectral density (Kondo peak) splits and the density of the doublet of higher energy r 2s ðoÞ shifts above the Ferrmi energy. The Kondo temperature T K (determined by the half-width at half maximum of the Kondo peak in density of the doublet of lower energy r 1s ðoÞ) decreases dramatically. The variation of T K with d is reproduced by a simple variational calculation.
publishDate 2012
dc.date.none.fl_str_mv 2012-08
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/196930
Tosi, Leandro; Roura Bas, Pablo Gines; Aligia, Armando Angel; Transition between SU(4) and SU(2) Kondo effect; Elsevier Science; Physica B: Condensed Matter; 407; 16; 8-2012; 3259-3262
0921-4526
CONICET Digital
CONICET
url http://hdl.handle.net/11336/196930
identifier_str_mv Tosi, Leandro; Roura Bas, Pablo Gines; Aligia, Armando Angel; Transition between SU(4) and SU(2) Kondo effect; Elsevier Science; Physica B: Condensed Matter; 407; 16; 8-2012; 3259-3262
0921-4526
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0921452611012749#
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.physb.2011.12.081
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier Science
publisher.none.fl_str_mv Elsevier Science
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.070432

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