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dc.contributor.authorBernhard, Ben Hurpt_BR
dc.contributor.authorIglesias, Jose Robertopt_BR
dc.date.accessioned2014-09-23T02:12:20Zpt_BR
dc.date.issued1993pt_BR
dc.identifier.issn0163-1829pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/103614pt_BR
dc.description.abstractA Green-function formalism is presented to study a Peierls-Hubbard Hamiltonian in two dimensions. The 1attice consists of parallel dimerized chains with alternating nearest-neighbor hoppings t and t 11 and another hopping t 1 between different chains. The method treats the interdimer hopping as a perturbation and yields exact results in the uncorre1ated case and for isolated dimers. The calculated spectral functions exhibit a number of narrow subbands with typical low-dimensional singularities. The dependence of the gap at the Fermi levei on the electron-electron interaction U agrees qualitatively with the exact result in the known one-dimensional nondimerized limit. The paramagnetic susceptibility shows a maximum structure at low temperatures that is enhanced by U and by dimerization anda Curie-Weiss behavior at high temperatures.en
dc.format.mimetypeapplication/pdf
dc.language.isoengpt_BR
dc.relation.ispartofPhysical review. B, Condensed matter. New York. Vol. 47, no. 19 (May 1993), p. 12408-12414pt_BR
dc.rightsOpen Accessen
dc.subjectFísica da matéria condensadapt_BR
dc.subjectModelo de hubbardpt_BR
dc.subjectMetodos de funcoes de greenpt_BR
dc.subjectMateria condensadapt_BR
dc.titleApproximate Treatment of a Two-Dimensional Anisotropic Peierls-Hubbard Modelpt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb000056645pt_BR
dc.type.originEstrangeiropt_BR


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