Thermal BCS-BEC Crossovers in Finite Systems

Autores
Plastino, Ángel Luis; Pennini, Flavia Catalina; Apel, Victor
Año de publicación
2025
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We investigate the thermal evolution of fermionic pairings in a finite-size SU(2) × SU(2)complex model, drawing an analogy to the BCS-BEC crossover in interacting quantumgases. Unlike the conventional crossover, which is driven by tuning the interaction strength,our study suggests that temperature alone can induce a smooth transition from weaklybound Cooper pairs (BCS-like state) to tightly bound dimers (BEC-like state). Using anexactly solvable model with a finite number of fermions, we analyze the structure ofeigenstates, pairing correlations, and thermodynamic response functions. We demonstratethat different multiplet structures, characterized by distinct quasi-spin quantum numbers,become thermally accessible, effectively mimicking the crossover behavior seen in ultracoldFermi gases. Our results provide new insights into the role of thermal fluctuations inquantum pairing phenomena and suggest alternative routes for exploring crossover physicsin mesoscopic and strongly correlated systems.
Fil: Plastino, Ángel Luis. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Física La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Física La Plata; Argentina
Fil: Pennini, Flavia Catalina. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Departamento de Física; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata; Argentina
Fil: Apel, Victor. Universidad Católica del Norte; Chile
Materia
BCS-BEC crossover
fermionic pairing correlations
statistical quantifiers
finite-size systems
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:11336/276807
Acceder
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network_name_str CONICET Digital (CONICET)
spelling Thermal BCS-BEC Crossovers in Finite SystemsPlastino, Ángel LuisPennini, Flavia CatalinaApel, VictorBCS-BEC crossoverfermionic pairing correlationsstatistical quantifiersfinite-size systemshttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1We investigate the thermal evolution of fermionic pairings in a finite-size SU(2) × SU(2)complex model, drawing an analogy to the BCS-BEC crossover in interacting quantumgases. Unlike the conventional crossover, which is driven by tuning the interaction strength,our study suggests that temperature alone can induce a smooth transition from weaklybound Cooper pairs (BCS-like state) to tightly bound dimers (BEC-like state). Using anexactly solvable model with a finite number of fermions, we analyze the structure ofeigenstates, pairing correlations, and thermodynamic response functions. We demonstratethat different multiplet structures, characterized by distinct quasi-spin quantum numbers,become thermally accessible, effectively mimicking the crossover behavior seen in ultracoldFermi gases. Our results provide new insights into the role of thermal fluctuations inquantum pairing phenomena and suggest alternative routes for exploring crossover physicsin mesoscopic and strongly correlated systems.Fil: Plastino, Ángel Luis. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Física La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Física La Plata; ArgentinaFil: Pennini, Flavia Catalina. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Departamento de Física; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata; ArgentinaFil: Apel, Victor. Universidad Católica del Norte; ChileMolecular Diversity Preservation International2025-10info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/276807Plastino, Ángel Luis; Pennini, Flavia Catalina; Apel, Victor; Thermal BCS-BEC Crossovers in Finite Systems; Molecular Diversity Preservation International; Entropy; 27; 11; 10-2025; 1116-11341099-4300CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.mdpi.com/1099-4300/27/11/1116info:eu-repo/semantics/altIdentifier/doi/10.3390/e27111116info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-12-23T14:52:52Zoai:ri.conicet.gov.ar:11336/276807instacron: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:34982025-12-23 14:52:53.233CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Thermal BCS-BEC Crossovers in Finite Systems
title Thermal BCS-BEC Crossovers in Finite Systems
spellingShingle Thermal BCS-BEC Crossovers in Finite Systems
Plastino, Ángel Luis
BCS-BEC crossover
fermionic pairing correlations
statistical quantifiers
finite-size systems
title_short Thermal BCS-BEC Crossovers in Finite Systems
title_full Thermal BCS-BEC Crossovers in Finite Systems
title_fullStr Thermal BCS-BEC Crossovers in Finite Systems
title_full_unstemmed Thermal BCS-BEC Crossovers in Finite Systems
title_sort Thermal BCS-BEC Crossovers in Finite Systems
dc.creator.none.fl_str_mv Plastino, Ángel Luis
Pennini, Flavia Catalina
Apel, Victor
author Plastino, Ángel Luis
author_facet Plastino, Ángel Luis
Pennini, Flavia Catalina
Apel, Victor
author_role author
author2 Pennini, Flavia Catalina
Apel, Victor
author2_role author
author
dc.subject.none.fl_str_mv BCS-BEC crossover
fermionic pairing correlations
statistical quantifiers
finite-size systems
topic BCS-BEC crossover
fermionic pairing correlations
statistical quantifiers
finite-size systems
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 investigate the thermal evolution of fermionic pairings in a finite-size SU(2) × SU(2)complex model, drawing an analogy to the BCS-BEC crossover in interacting quantumgases. Unlike the conventional crossover, which is driven by tuning the interaction strength,our study suggests that temperature alone can induce a smooth transition from weaklybound Cooper pairs (BCS-like state) to tightly bound dimers (BEC-like state). Using anexactly solvable model with a finite number of fermions, we analyze the structure ofeigenstates, pairing correlations, and thermodynamic response functions. We demonstratethat different multiplet structures, characterized by distinct quasi-spin quantum numbers,become thermally accessible, effectively mimicking the crossover behavior seen in ultracoldFermi gases. Our results provide new insights into the role of thermal fluctuations inquantum pairing phenomena and suggest alternative routes for exploring crossover physicsin mesoscopic and strongly correlated systems.
Fil: Plastino, Ángel Luis. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Física La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Física La Plata; Argentina
Fil: Pennini, Flavia Catalina. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Departamento de Física; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata; Argentina
Fil: Apel, Victor. Universidad Católica del Norte; Chile
description We investigate the thermal evolution of fermionic pairings in a finite-size SU(2) × SU(2)complex model, drawing an analogy to the BCS-BEC crossover in interacting quantumgases. Unlike the conventional crossover, which is driven by tuning the interaction strength,our study suggests that temperature alone can induce a smooth transition from weaklybound Cooper pairs (BCS-like state) to tightly bound dimers (BEC-like state). Using anexactly solvable model with a finite number of fermions, we analyze the structure ofeigenstates, pairing correlations, and thermodynamic response functions. We demonstratethat different multiplet structures, characterized by distinct quasi-spin quantum numbers,become thermally accessible, effectively mimicking the crossover behavior seen in ultracoldFermi gases. Our results provide new insights into the role of thermal fluctuations inquantum pairing phenomena and suggest alternative routes for exploring crossover physicsin mesoscopic and strongly correlated systems.
publishDate 2025
dc.date.none.fl_str_mv 2025-10
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/11336/276807
Plastino, Ángel Luis; Pennini, Flavia Catalina; Apel, Victor; Thermal BCS-BEC Crossovers in Finite Systems; Molecular Diversity Preservation International; Entropy; 27; 11; 10-2025; 1116-1134
1099-4300
CONICET Digital
CONICET
url http://hdl.handle.net/11336/276807
identifier_str_mv Plastino, Ángel Luis; Pennini, Flavia Catalina; Apel, Victor; Thermal BCS-BEC Crossovers in Finite Systems; Molecular Diversity Preservation International; Entropy; 27; 11; 10-2025; 1116-1134
1099-4300
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://www.mdpi.com/1099-4300/27/11/1116
info:eu-repo/semantics/altIdentifier/doi/10.3390/e27111116
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
dc.publisher.none.fl_str_mv Molecular Diversity Preservation International
publisher.none.fl_str_mv Molecular Diversity Preservation International
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 12.952241

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