Thermal decay of two-spinon bound states in quasi-two-dimensional triangular antiferromagnets

Autores
Pomponio, Ignacio Luciano; Ghioldi, Esteban Agustín; Gazza, Claudio Javier; Manuel, Luis Oscar; Trumper, Adolfo Emilio
Año de publicación
2024
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We analyze the temperature evolution of the anomalous magnetic spectrum of the spin-1/2 triangular quantum Heisenberg antiferromagnet, which is proximate to a quantum phase transition leading to a spin-liquid phase. Recently, its low-energy excitations have been identified with two-spinon bound states, well defined in an ample region of the Brillouin zone. In this work, we compute the thermal magnetic spectrum within a Schwinger boson approach, incorporating Gaussian fluctuations around the saddle-point approximation. In order to account for a finite Néel temperature TN , we incorporate an exchange interaction between triangular layers. As temperature rises, the dispersion relation of the two-spinon bound states, representing single-magnon excitations, remains unchanged but becomes mixed with the thermally activated spinon continuum. Consequently, a crossover occurs at a temperature T∗ ≃ 0.75TN , defining a terminated Goldstone regime between T ∗ and TN , where only the magnons close to the Goldstone modes survive as well-defined excitations, up to the Néel temperature. Our results support the idea that the fractionalization of magnons near a transition to a disordered phase can be extended to more realistic quasi-two-dimensional frustrated antiferromagnets.
Fil: Pomponio, Ignacio Luciano. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto de Física de Rosario. Universidad Nacional de Rosario. Instituto de Física de Rosario; Argentina
Fil: Ghioldi, Esteban Agustín. University of Tennessee; Estados Unidos. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto de Física de Rosario. Universidad Nacional de Rosario. Instituto de Física de Rosario; Argentina
Fil: Gazza, Claudio Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto de Física de Rosario. Universidad Nacional de Rosario. Instituto de Física de Rosario; Argentina
Fil: Manuel, Luis Oscar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto de Física de Rosario. Universidad Nacional de Rosario. Instituto de Física de Rosario; Argentina
Fil: Trumper, Adolfo Emilio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto de Física de Rosario. Universidad Nacional de Rosario. Instituto de Física de Rosario; Argentina
Materia
Heisenberg model
Triangular antiferromagnet
Schwinger Boson Theory
Two spinon bound state
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:11336/264188
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/264188
network_acronym_str CONICETDig
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network_name_str CONICET Digital (CONICET)
spelling Thermal decay of two-spinon bound states in quasi-two-dimensional triangular antiferromagnetsPomponio, Ignacio LucianoGhioldi, Esteban AgustínGazza, Claudio JavierManuel, Luis OscarTrumper, Adolfo EmilioHeisenberg modelTriangular antiferromagnetSchwinger Boson TheoryTwo spinon bound statehttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1We analyze the temperature evolution of the anomalous magnetic spectrum of the spin-1/2 triangular quantum Heisenberg antiferromagnet, which is proximate to a quantum phase transition leading to a spin-liquid phase. Recently, its low-energy excitations have been identified with two-spinon bound states, well defined in an ample region of the Brillouin zone. In this work, we compute the thermal magnetic spectrum within a Schwinger boson approach, incorporating Gaussian fluctuations around the saddle-point approximation. In order to account for a finite Néel temperature TN , we incorporate an exchange interaction between triangular layers. As temperature rises, the dispersion relation of the two-spinon bound states, representing single-magnon excitations, remains unchanged but becomes mixed with the thermally activated spinon continuum. Consequently, a crossover occurs at a temperature T∗ ≃ 0.75TN , defining a terminated Goldstone regime between T ∗ and TN , where only the magnons close to the Goldstone modes survive as well-defined excitations, up to the Néel temperature. Our results support the idea that the fractionalization of magnons near a transition to a disordered phase can be extended to more realistic quasi-two-dimensional frustrated antiferromagnets.Fil: Pomponio, Ignacio Luciano. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto de Física de Rosario. Universidad Nacional de Rosario. Instituto de Física de Rosario; ArgentinaFil: Ghioldi, Esteban Agustín. University of Tennessee; Estados Unidos. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto de Física de Rosario. Universidad Nacional de Rosario. Instituto de Física de Rosario; ArgentinaFil: Gazza, Claudio Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto de Física de Rosario. Universidad Nacional de Rosario. Instituto de Física de Rosario; ArgentinaFil: Manuel, Luis Oscar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto de Física de Rosario. Universidad Nacional de Rosario. Instituto de Física de Rosario; ArgentinaFil: Trumper, Adolfo Emilio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto de Física de Rosario. Universidad Nacional de Rosario. Instituto de Física de Rosario; ArgentinaAmerican Physical Society2024-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/264188Pomponio, Ignacio Luciano; Ghioldi, Esteban Agustín; Gazza, Claudio Javier; Manuel, Luis Oscar; Trumper, Adolfo Emilio; Thermal decay of two-spinon bound states in quasi-two-dimensional triangular antiferromagnets; American Physical Society; Physical Review B; 110; 22; 12-2024; 1-132469-9950CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://link.aps.org/doi/10.1103/PhysRevB.110.224402info:eu-repo/semantics/altIdentifier/doi/10.1103/PhysRevB.110.224402info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-11-05T09:58:51Zoai:ri.conicet.gov.ar:11336/264188instacron: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:34982025-11-05 09:58:51.368CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Thermal decay of two-spinon bound states in quasi-two-dimensional triangular antiferromagnets
title Thermal decay of two-spinon bound states in quasi-two-dimensional triangular antiferromagnets
spellingShingle Thermal decay of two-spinon bound states in quasi-two-dimensional triangular antiferromagnets
Pomponio, Ignacio Luciano
Heisenberg model
Triangular antiferromagnet
Schwinger Boson Theory
Two spinon bound state
title_short Thermal decay of two-spinon bound states in quasi-two-dimensional triangular antiferromagnets
title_full Thermal decay of two-spinon bound states in quasi-two-dimensional triangular antiferromagnets
title_fullStr Thermal decay of two-spinon bound states in quasi-two-dimensional triangular antiferromagnets
title_full_unstemmed Thermal decay of two-spinon bound states in quasi-two-dimensional triangular antiferromagnets
title_sort Thermal decay of two-spinon bound states in quasi-two-dimensional triangular antiferromagnets
dc.creator.none.fl_str_mv Pomponio, Ignacio Luciano
Ghioldi, Esteban Agustín
Gazza, Claudio Javier
Manuel, Luis Oscar
Trumper, Adolfo Emilio
author Pomponio, Ignacio Luciano
author_facet Pomponio, Ignacio Luciano
Ghioldi, Esteban Agustín
Gazza, Claudio Javier
Manuel, Luis Oscar
Trumper, Adolfo Emilio
author_role author
author2 Ghioldi, Esteban Agustín
Gazza, Claudio Javier
Manuel, Luis Oscar
Trumper, Adolfo Emilio
author2_role author
author
author
author
dc.subject.none.fl_str_mv Heisenberg model
Triangular antiferromagnet
Schwinger Boson Theory
Two spinon bound state
topic Heisenberg model
Triangular antiferromagnet
Schwinger Boson Theory
Two spinon bound state
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv We analyze the temperature evolution of the anomalous magnetic spectrum of the spin-1/2 triangular quantum Heisenberg antiferromagnet, which is proximate to a quantum phase transition leading to a spin-liquid phase. Recently, its low-energy excitations have been identified with two-spinon bound states, well defined in an ample region of the Brillouin zone. In this work, we compute the thermal magnetic spectrum within a Schwinger boson approach, incorporating Gaussian fluctuations around the saddle-point approximation. In order to account for a finite Néel temperature TN , we incorporate an exchange interaction between triangular layers. As temperature rises, the dispersion relation of the two-spinon bound states, representing single-magnon excitations, remains unchanged but becomes mixed with the thermally activated spinon continuum. Consequently, a crossover occurs at a temperature T∗ ≃ 0.75TN , defining a terminated Goldstone regime between T ∗ and TN , where only the magnons close to the Goldstone modes survive as well-defined excitations, up to the Néel temperature. Our results support the idea that the fractionalization of magnons near a transition to a disordered phase can be extended to more realistic quasi-two-dimensional frustrated antiferromagnets.
Fil: Pomponio, Ignacio Luciano. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto de Física de Rosario. Universidad Nacional de Rosario. Instituto de Física de Rosario; Argentina
Fil: Ghioldi, Esteban Agustín. University of Tennessee; Estados Unidos. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto de Física de Rosario. Universidad Nacional de Rosario. Instituto de Física de Rosario; Argentina
Fil: Gazza, Claudio Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto de Física de Rosario. Universidad Nacional de Rosario. Instituto de Física de Rosario; Argentina
Fil: Manuel, Luis Oscar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto de Física de Rosario. Universidad Nacional de Rosario. Instituto de Física de Rosario; Argentina
Fil: Trumper, Adolfo Emilio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto de Física de Rosario. Universidad Nacional de Rosario. Instituto de Física de Rosario; Argentina
description We analyze the temperature evolution of the anomalous magnetic spectrum of the spin-1/2 triangular quantum Heisenberg antiferromagnet, which is proximate to a quantum phase transition leading to a spin-liquid phase. Recently, its low-energy excitations have been identified with two-spinon bound states, well defined in an ample region of the Brillouin zone. In this work, we compute the thermal magnetic spectrum within a Schwinger boson approach, incorporating Gaussian fluctuations around the saddle-point approximation. In order to account for a finite Néel temperature TN , we incorporate an exchange interaction between triangular layers. As temperature rises, the dispersion relation of the two-spinon bound states, representing single-magnon excitations, remains unchanged but becomes mixed with the thermally activated spinon continuum. Consequently, a crossover occurs at a temperature T∗ ≃ 0.75TN , defining a terminated Goldstone regime between T ∗ and TN , where only the magnons close to the Goldstone modes survive as well-defined excitations, up to the Néel temperature. Our results support the idea that the fractionalization of magnons near a transition to a disordered phase can be extended to more realistic quasi-two-dimensional frustrated antiferromagnets.
publishDate 2024
dc.date.none.fl_str_mv 2024-12
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/11336/264188
Pomponio, Ignacio Luciano; Ghioldi, Esteban Agustín; Gazza, Claudio Javier; Manuel, Luis Oscar; Trumper, Adolfo Emilio; Thermal decay of two-spinon bound states in quasi-two-dimensional triangular antiferromagnets; American Physical Society; Physical Review B; 110; 22; 12-2024; 1-13
2469-9950
CONICET Digital
CONICET
url http://hdl.handle.net/11336/264188
identifier_str_mv Pomponio, Ignacio Luciano; Ghioldi, Esteban Agustín; Gazza, Claudio Javier; Manuel, Luis Oscar; Trumper, Adolfo Emilio; Thermal decay of two-spinon bound states in quasi-two-dimensional triangular antiferromagnets; American Physical Society; Physical Review B; 110; 22; 12-2024; 1-13
2469-9950
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://link.aps.org/doi/10.1103/PhysRevB.110.224402
info:eu-repo/semantics/altIdentifier/doi/10.1103/PhysRevB.110.224402
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
application/pdf
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 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 13.121305

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