Renormalization Group calculations with k|| dependent couplings in a ladder

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dc.creatorAbramovici, G.
dc.creatorNickel, J. C.
dc.creatorHeritier, M.
dc.date2005-05-16
dc.date.accessioned2026-07-07T03:05:14Z
dc.date.available2026-07-07T03:05:14Z
dc.descriptionWe calculate the phase diagram of a ladder system, with a Hubbard interaction and an interchain coupling $t_\perp$. We use a Renormalization Group method, in a one loop expansion, introducing an original method to include $k_{||}$ dependence of couplings. We also classify the order parameters corresponding to ladder instabilities. We obtain different results, depending on whether we include $k_{||}$ dependence or not. When we do so, we observe a region with large antiferromagnetic fluctuations, in the vicinity of small $t_\perp$, followed by a superconducting region with a simultaneous divergence of the Spin Density Waves channel. We also investigate the effect of a non local backward interchain scattering : we observe, on one hand, the suppression of singlet superconductivity and of Spin Density Waves, and, on the other hand, the increase of Charge Density Waves and, for some values of $t_\perp$, of triplet superconductivity. Our results eventually show that $k_{||}$ is an influential variable in the Renormalization Group flow, for this kind of systems.
dc.description20 pages, 19 figures, accepted in Phys. Rev. B 71 v. 24
dc.identifierhttps://arxiv.org/abs/cond-mat/0505385
dc.identifierhttp://arxiv.org/abs/cond-mat/0505385
dc.identifierPhysical Review B 72, 045120 (2005)
dc.identifierdoi:10.1103/PhysRevB.72.045120
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/26371
dc.subjectStrongly Correlated Electrons
dc.subjectSuperconductivity
dc.titleRenormalization Group calculations with k|| dependent couplings in a ladder
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