Orbital-selective crossover and Mott transitions in an asymmetric Hubbard model of cold atoms in optical lattices

Autores
Winograd, Emilio Andres; Chitra, R.; Rozenberg, Marcelo Javier
Año de publicación
2011
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We study the asymmetric Hubbard model at half filling as a generic model to describe the physics of two species of repulsively interacting fermionic cold atoms in optical lattices. We use dynamical mean-field theory to obtain the paramagnetic phase diagram of the model as a function of temperature, interaction strength, and hopping asymmetry. A Mott transition with a region of two coexistent solutions is found for all nonzero values of the hopping asymmetry. At low temperatures the metallic phase is a heavy Fermi liquid, qualitatively analogous to the Fermi-liquid state of the symmetric Hubbard model. Above a coherence temperature, an orbital-selective crossover takes place, wherein one fermionic species effectively localizes, and the resulting bad metallic state resembles the non-Fermi-liquid state of the Falicov-Kimball model. We compute observables relevant to cold atom systems such as the double occupation, the specific heat, and entropy, and characterize their behavior in the different phases. © 2011 American Physical Society.
Fil: Winograd, Emilio Andres. Universite Paris-sud Xi; Francia
Fil: Chitra, R.. Universite Pierre et Marie Curie; Francia
Fil: Rozenberg, Marcelo Javier. Universite Paris-sud Xi; Francia. Universidad de Buenos Aires; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Física de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Física de Buenos Aires; Argentina
Materia
Strongly Correlated Electrons
Optical Lattices
Cold Atoms
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:11336/56618
Acceder
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network_name_str CONICET Digital (CONICET)
spelling Orbital-selective crossover and Mott transitions in an asymmetric Hubbard model of cold atoms in optical latticesWinograd, Emilio AndresChitra, R.Rozenberg, Marcelo JavierStrongly Correlated ElectronsOptical LatticesCold Atomshttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1We study the asymmetric Hubbard model at half filling as a generic model to describe the physics of two species of repulsively interacting fermionic cold atoms in optical lattices. We use dynamical mean-field theory to obtain the paramagnetic phase diagram of the model as a function of temperature, interaction strength, and hopping asymmetry. A Mott transition with a region of two coexistent solutions is found for all nonzero values of the hopping asymmetry. At low temperatures the metallic phase is a heavy Fermi liquid, qualitatively analogous to the Fermi-liquid state of the symmetric Hubbard model. Above a coherence temperature, an orbital-selective crossover takes place, wherein one fermionic species effectively localizes, and the resulting bad metallic state resembles the non-Fermi-liquid state of the Falicov-Kimball model. We compute observables relevant to cold atom systems such as the double occupation, the specific heat, and entropy, and characterize their behavior in the different phases. © 2011 American Physical Society.Fil: Winograd, Emilio Andres. Universite Paris-sud Xi; FranciaFil: Chitra, R.. Universite Pierre et Marie Curie; FranciaFil: Rozenberg, Marcelo Javier. Universite Paris-sud Xi; Francia. Universidad de Buenos Aires; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Física de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Física de Buenos Aires; ArgentinaAmerican Physical Society2011-11info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/56618Winograd, Emilio Andres; Chitra, R.; Rozenberg, Marcelo Javier; Orbital-selective crossover and Mott transitions in an asymmetric Hubbard model of cold atoms in optical lattices; American Physical Society; Physical Review B: Condensed Matter and Materials Physics; 84; 23; 11-2011; 233102-2331051098-0121CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://journals.aps.org/prb/abstract/10.1103/PhysRevB.84.233102info:eu-repo/semantics/altIdentifier/doi/10.1103/PhysRevB.84.233102info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-15T14:28:36Zoai:ri.conicet.gov.ar:11336/56618instacron: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:34982025-10-15 14:28:36.739CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Orbital-selective crossover and Mott transitions in an asymmetric Hubbard model of cold atoms in optical lattices
title Orbital-selective crossover and Mott transitions in an asymmetric Hubbard model of cold atoms in optical lattices
spellingShingle Orbital-selective crossover and Mott transitions in an asymmetric Hubbard model of cold atoms in optical lattices
Winograd, Emilio Andres
Strongly Correlated Electrons
Optical Lattices
Cold Atoms
title_short Orbital-selective crossover and Mott transitions in an asymmetric Hubbard model of cold atoms in optical lattices
title_full Orbital-selective crossover and Mott transitions in an asymmetric Hubbard model of cold atoms in optical lattices
title_fullStr Orbital-selective crossover and Mott transitions in an asymmetric Hubbard model of cold atoms in optical lattices
title_full_unstemmed Orbital-selective crossover and Mott transitions in an asymmetric Hubbard model of cold atoms in optical lattices
title_sort Orbital-selective crossover and Mott transitions in an asymmetric Hubbard model of cold atoms in optical lattices
dc.creator.none.fl_str_mv Winograd, Emilio Andres
Chitra, R.
Rozenberg, Marcelo Javier
author Winograd, Emilio Andres
author_facet Winograd, Emilio Andres
Chitra, R.
Rozenberg, Marcelo Javier
author_role author
author2 Chitra, R.
Rozenberg, Marcelo Javier
author2_role author
author
dc.subject.none.fl_str_mv Strongly Correlated Electrons
Optical Lattices
Cold Atoms
topic Strongly Correlated Electrons
Optical Lattices
Cold Atoms
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 study the asymmetric Hubbard model at half filling as a generic model to describe the physics of two species of repulsively interacting fermionic cold atoms in optical lattices. We use dynamical mean-field theory to obtain the paramagnetic phase diagram of the model as a function of temperature, interaction strength, and hopping asymmetry. A Mott transition with a region of two coexistent solutions is found for all nonzero values of the hopping asymmetry. At low temperatures the metallic phase is a heavy Fermi liquid, qualitatively analogous to the Fermi-liquid state of the symmetric Hubbard model. Above a coherence temperature, an orbital-selective crossover takes place, wherein one fermionic species effectively localizes, and the resulting bad metallic state resembles the non-Fermi-liquid state of the Falicov-Kimball model. We compute observables relevant to cold atom systems such as the double occupation, the specific heat, and entropy, and characterize their behavior in the different phases. © 2011 American Physical Society.
Fil: Winograd, Emilio Andres. Universite Paris-sud Xi; Francia
Fil: Chitra, R.. Universite Pierre et Marie Curie; Francia
Fil: Rozenberg, Marcelo Javier. Universite Paris-sud Xi; Francia. Universidad de Buenos Aires; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Física de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Física de Buenos Aires; Argentina
description We study the asymmetric Hubbard model at half filling as a generic model to describe the physics of two species of repulsively interacting fermionic cold atoms in optical lattices. We use dynamical mean-field theory to obtain the paramagnetic phase diagram of the model as a function of temperature, interaction strength, and hopping asymmetry. A Mott transition with a region of two coexistent solutions is found for all nonzero values of the hopping asymmetry. At low temperatures the metallic phase is a heavy Fermi liquid, qualitatively analogous to the Fermi-liquid state of the symmetric Hubbard model. Above a coherence temperature, an orbital-selective crossover takes place, wherein one fermionic species effectively localizes, and the resulting bad metallic state resembles the non-Fermi-liquid state of the Falicov-Kimball model. We compute observables relevant to cold atom systems such as the double occupation, the specific heat, and entropy, and characterize their behavior in the different phases. © 2011 American Physical Society.
publishDate 2011
dc.date.none.fl_str_mv 2011-11
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/11336/56618
Winograd, Emilio Andres; Chitra, R.; Rozenberg, Marcelo Javier; Orbital-selective crossover and Mott transitions in an asymmetric Hubbard model of cold atoms in optical lattices; American Physical Society; Physical Review B: Condensed Matter and Materials Physics; 84; 23; 11-2011; 233102-233105
1098-0121
CONICET Digital
CONICET
url http://hdl.handle.net/11336/56618
identifier_str_mv Winograd, Emilio Andres; Chitra, R.; Rozenberg, Marcelo Javier; Orbital-selective crossover and Mott transitions in an asymmetric Hubbard model of cold atoms in optical lattices; American Physical Society; Physical Review B: Condensed Matter and Materials Physics; 84; 23; 11-2011; 233102-233105
1098-0121
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://journals.aps.org/prb/abstract/10.1103/PhysRevB.84.233102
info:eu-repo/semantics/altIdentifier/doi/10.1103/PhysRevB.84.233102
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 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 13.22299

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