Renormalization of the electron-spin-fluctuation interaction in the t-t'-U Hubbard model

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dc.creatorHuang, Z. B.
dc.creatorHanke, W.
dc.creatorArrigoni, E.
dc.creatorChubukov, A. V.
dc.date2006-03-01
dc.date2006-11-08
dc.date.accessioned2026-07-07T07:02:03Z
dc.date.available2026-07-07T07:02:03Z
dc.descriptionWe study the renormalization of the electron-spin-fluctuation (el-sp) vertex in a two-dimensional Hubbard model with nearest-neighbor (t) and next-nearest-neighbor (t') hopping by a Quantum-Monte-Carlo calculation. Our results show that for t'=0, the renormalized el-sp vertex decreases quite generally with decreasing temperature at all spin-fluctuation momentum transfers. The suppression of the el-sp vertex results in a substantial reduction of the effective pairing interaction mediated by antiferromagnetic spin fluctuations in both the intermediate- and strong-correlation regimes. The inclusion of a finite t'/t<0, increases the Landau damping rate of spin fluctuations, especially in the overdoped region. The increased damping rate leads to smaller vertex corrections, in agreement with earlier diagrammatic calculations. Still, the vertex correction reduces the spin-fermion vertex, as at t'=0.
dc.description7 pages, 7 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0603014
dc.identifierhttp://arxiv.org/abs/cond-mat/0603014
dc.identifierPhys. Rev. B 74, 184508 (2006)
dc.identifierdoi:10.1103/PhysRevB.74.184508
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/108469
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titleRenormalization of the electron-spin-fluctuation interaction in the t-t'-U Hubbard model
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