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dc.contributor.authorGarcía Ramos, José Enrique 
dc.contributor.authorDukelsky, J.
dc.contributor.authorPérez Fernández, Pedro
dc.date.accessioned2019-02-26T10:26:45Z
dc.date.available2019-02-26T10:26:45Z
dc.date.issued2019
dc.identifier.citationGarcía-Ramos, J. E., Dukelsky, J., Pérez-Fernández, P., & Arias, J. (2019). An extended Agassi model: algebraic structure, phase diagram, and large size limit. Physica Scripta, 94(4), 44003. https://doi.org/10.1088/1402-4896/aafc6d
dc.identifier.issn0031-8949
dc.identifier.issn1402-4896 (electrónico)
dc.identifier.urihttp://hdl.handle.net/10272/16020
dc.description.abstractThe Agassi model (Agassi 1968 Nucl. Phys. A 116 49) is a schematic two-level model that involves pairing and monopole–monopole interactions. It is, therefore, an extension of the well known Lipkin–Meshkov–Glick model (Lipkin et al 1965 Nucl. Phys. 62 188). In this paper we review the algebraic formulation of an extension of the Agassi model as well as its bosonic realization through the Schwinger representation. Moreover, a mean-field approximation for the model is presented and its phase diagram discussed. Finally, a 1/j analysis, with j proportional to the degeneracy of each level, is worked out to obtain the thermodynamic limit of the ground state energy and some order parameters from the exact Hamiltonian diagonalization for finite—j.es_ES
dc.description.sponsorshipThis work has been supported by the Spanish Ministerio de Economia y Competitividad and the European regional development fund (FEDER) under Projects No. FIS2017-88410-88410-P, FIS2014-53448-C2-2-P and FIS2015-63770-P, and by Consejeria de Economia, Innovacion, Ciencia y Empleo de la Junta de Andalucia (Spain) under Group FQM-160 and FQM-370.
dc.language.isoenges_ES
dc.publisherIOP Publishinges_ES
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/es/*
dc.subject.otherAgassi modeles_ES
dc.subject.otherQuantum phase transitiones_ES
dc.subject.otherPhase diagrames_ES
dc.subject.other1/Nexpansiones_ES
dc.titleAn extended Agassi model: algebraic structure, phase diagram, and large size limites_ES
dc.typeinfo:eu-repo/semantics/articlees_ES
dc.relation.publisherversionhttps://doi.org/10.1088/1402-4896/aafc6des_ES
dc.identifier.doi10.1088/1402-4896/aafc6d
dc.rights.accessRightsinfo:eu-repo/semantics/openAccesses_ES
dc.relation.projectIDinfo:eu-repo/grantAgreement/Consejeria de Economia, Innovacion, Ciencia y Empleo de la Junta de Andalucia (Spain) [FQM-160 and FQM-370]


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