Effects of two-site composite excitations in the Hubbard model

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dc.creatorAvella, A.
dc.creatorMancini, F.
dc.creatorOdashima, S.
dc.date2004-01-07
dc.date.accessioned2026-07-07T02:55:47Z
dc.date.available2026-07-07T02:55:47Z
dc.descriptionThe electronic states of the Hubbard model are investigated by use of the Composite Operator Method. In addition to the Hubbard operators, two other operators related with two-site composite excitations are included in the basis. Within the present formulation, higher-order composite excitations are reduced to the chosen operatorial basis by means of a procedure preserving the particle-hole symmetry. The positive comparison with numerical simulations for the double occupancy indicates that such approximation improves over the two-pole approximation.
dc.description2 pages, 1 figure
dc.identifierhttps://arxiv.org/abs/cond-mat/0401083
dc.identifierhttp://arxiv.org/abs/cond-mat/0401083
dc.identifierJ. Magn. Magn. Mater. 272, E311 (2004)
dc.identifierdoi:10.1016/j.jmmm.2003.12.1206
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/23071
dc.subjectStrongly Correlated Electrons
dc.titleEffects of two-site composite excitations in the Hubbard model
dc.typetext

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