The half-filled Hubbard chain in the Composite Operator Method: A comparison with Bethe Ansatz

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dc.creatorSanchez, M. M.
dc.creatorAvella, A.
dc.creatorMancini, F.
dc.date1998-07-28
dc.date.accessioned2026-07-07T03:11:09Z
dc.date.available2026-07-07T03:11:09Z
dc.descriptionThe one-dimensional Hubbard model at half-filling is studied in the framework of the Composite Operator Method using a static approximation. A solution characterized by strong antiferromagnetic correlations and a gap for any nonzero on-site interaction U is found. The corresponding ground-state energy, double occupancy and specific heat are in excellent agreement with those obtained within the Bethe Ansatz. These results show that the Composite Operator Method is an appropriate framework for the half-filled Hubbard chain and can be applied to evaluate properties, like the correlation functions, which cannot be obtained by means of the Bethe Ansatz, except for some limiting cases.
dc.description7 pages, 3 embedded Postscript figures, EuroTeX, submitted to EuroPhysics Letters
dc.identifierhttps://arxiv.org/abs/cond-mat/9807368
dc.identifierhttp://arxiv.org/abs/cond-mat/9807368
dc.identifierEurophys. Lett. 44, 328 (1998)
dc.identifierdoi:10.1209/epl/i1998-00478-8
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/28467
dc.subjectStrongly Correlated Electrons
dc.titleThe half-filled Hubbard chain in the Composite Operator Method: A comparison with Bethe Ansatz
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