Barnes slave boson approach to the two-site single impurity Anderson model with non-local interaction

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dc.creatorFresard, Raymond
dc.creatorOuerdane, Henni
dc.creatorKopp, Thilo
dc.date2008-01-29
dc.date2008-04-30
dc.date.accessioned2026-07-07T09:35:44Z
dc.date.available2026-07-07T09:35:44Z
dc.descriptionThe Barnes slave boson approach to the $U=\infty$ single impurity Anderson model extended by a non-local Coulomb interaction is revisited. We demonstrate first that the radial gauge representation facilitates the treatment of such a non-local interaction by performing the \emph{exact} evaluation of the path integrals representing the partition function, the impurity hole density and the impurity hole density autocorrelation function for a two-site cluster. The free energy is also obtained on the same footing. Next, the exact results are compared to their approximations at saddle-point level, and it is shown that the saddle point evaluation recovers the exact answer in the limit of strong non-local Coulomb interaction, while the agreement between both schemes remains satisfactory in a large parameter range.
dc.description6 pages, 2 figures, published version
dc.identifierhttps://arxiv.org/abs/0801.4496
dc.identifierhttp://arxiv.org/abs/0801.4496
dc.identifierEurophys. Lett. 82, 31001 (2008)
dc.identifierdoi:10.1209/0295-5075/82/31001
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/159929
dc.subjectStrongly Correlated Electrons
dc.titleBarnes slave boson approach to the two-site single impurity Anderson model with non-local interaction
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