Modelo de Hubbard extendido para fermiones con tres grados de libertad internos

dc.contributor.advisorSilva Valencia, Jeresonspa
dc.contributor.authorPérez Romero, Arturospa
dc.contributor.researchgroupSistemas Correlacionados (SISCO)spa
dc.date.accessioned2020-08-08T17:56:53Zspa
dc.date.available2020-08-08T17:56:53Zspa
dc.date.issued2019-04-20spa
dc.description.abstractEn la presente tesis se considera fermiones con tres grados de libertad internos en una dimensión, sistema que puede ser descritos por un modelo de Fermi-Hubbard SU(3), al cual se adiciona un término de interacción a primeros vecinos. El modelo obtenido no tiene solución exacta, pero usando el método de grupo de renormalización de la matriz densidad (DMRG) se evidencia la presencia de seis fases: onda de densidad de espín (SDW), onda de densidad de carga (CDW), separación de fase (PS), metalica, apareamiento de pares (PP) y una fase que se denominó como Beat. Además, usando la entropía de von Neumann y el parámetro de Luttinger se determinó los puntos críticos entre algunas de estas fases. De tal modo que se construyó un diagrama de fases para un modelo de Hubbard extendido SU(3), el cual presenta diferencias con el mismo modelo con dos grados de libertad internos.spa
dc.description.abstractIn the present work we consider three-color fermions in a one-dimensional lattice. The system not only can be described by a SU(3) Fermi-Hubbard model but also is expressed by an extended model version. In our case, we add a next-neighbor interaction term at SU(3) Fermi-Hubbard model. The model obtained doesn’t have an exact solution, but we used the density matrix renormalization group method (DMRG) to find some model features. Our results reveal six different phases: spin density wave (SDW), charge density wave (CDW), phase separation (PS), metallic phase, pairing phase (PP), and a new phase which we call it Beat phase. Furthermore, we used Luttinger parameter and von Neumann entropy that worked well in determining transition points. With these results, we create the extended SU(3) Fermi-Hubbard model phases diagram, which has different from the same SU(2) model.spa
dc.description.additionalLínea de investigación: Materia Condensadaspa
dc.description.degreelevelMaestríaspa
dc.format.extent80spa
dc.format.mimetypeapplication/pdfspa
dc.identifier.urihttps://repositorio.unal.edu.co/handle/unal/77982
dc.language.isospaspa
dc.publisher.branchUniversidad Nacional de Colombia - Sede Bogotáspa
dc.publisher.departmentDepartamento de Físicaspa
dc.publisher.programBogotá - Ciencias - Maestría en Ciencias - Físicaspa
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dc.subject.ddc530 - Físicaspa
dc.subject.ddc621 - Física aplicadaspa
dc.subject.ddc301 - Sociología y antropologíaspa
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dc.subject.proposalextended Hubbard modeleng
dc.subject.proposalmodelo de Hubbard extendidospa
dc.subject.proposalredes ópticasspa
dc.subject.proposaloptic latticeeng
dc.subject.proposalphase diagrameng
dc.subject.proposaldiagrama de fasesspa
dc.subject.proposaltres grados de libertadspa
dc.subject.proposalthree coloreng
dc.subject.proposalone dimensioneng
dc.subject.proposalunidimensionalspa
dc.titleModelo de Hubbard extendido para fermiones con tres grados de libertad internosspa
dc.title.alternativeExtended three-color Fermi Hubbardspa
dc.typeTrabajo de grado - Maestríaspa
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