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dc.contributor.authorRibeiro, André Neves-
dc.contributor.authorMacedo, Cláudio Andrade-
dc.date.accessioned2025-04-16T15:23:15Z-
dc.date.available2025-04-16T15:23:15Z-
dc.date.issued2010-
dc.identifier.citationRIBEIRO, A. N.; MACEDO, C. A. On the validity of the dynamical mean-field approximation for studying the two-dimensional Hubbard model on a square lattice. Advances in Condensed Matter Physics, v. 2010, n. 1, 2010. Disponível em: https://onlinelibrary.wiley.com/doi/epdf/10.1155/2010/487381. Acesso em: 16 abr. 2025.pt_BR
dc.identifier.issn1687-8108-
dc.identifier.issn1687-8124-
dc.identifier.urihttps://ri.ufs.br/jspui/handle/riufs/21801-
dc.languageengpt_BR
dc.publisherHindawi Publishing Corporationpt_BR
dc.relation.ispartofAdvances in Condensed Matter Physicspt_BR
dc.subjectDynamical mean-field approximation (DMFA)eng
dc.subjectHubbard modeleng
dc.subjectQuantum Monte Carlo (QMC)eng
dc.titleOn the validity of the dynamical mean-field approximation for studying the two-dimensional Hubbard model on a square latticept_BR
dc.typeArtigopt_BR
dc.identifier.licenseCreative Commons Atribuição 3.0 Não Adaptada (CC BY 3.0)pt_BR
dc.description.resumoThe dynamical mean-field approximation (DMFA) becomes exact in the limit of infinite dimensions, and allows results to beobtained in a nonperturbative regime without the limitations normally found with exact diagonalization (ED) and quantum Monte Carlo (QMC) methods. In this paper, we investigate the applicability of the method to lattices with small coordinationnumber in special situations. Specifically we use this approximation to study the two-dimensional (2D) Hubbard model on asquare lattice far from half filling. In this situation, we calculate the specific heat and find that when the filling decreases, thatis, antiferromagnetic correlations become less important, the agreement between DMFA and QMC results increases. Our resultsshow that the DMFA can be a valuable technique for studying the thermodynamic properties of the Hubbard model also on asquare lattice, but within a parameter range in which the antiferromagnetic correlations are not important.pt_BR
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