Charge susceptibility in the t-J model

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dc.creatorAristov, D. N.
dc.creatorKhaliullin, G.
dc.date2006-03-07
dc.date2006-07-10
dc.date.accessioned2026-07-07T07:02:12Z
dc.date.available2026-07-07T07:02:12Z
dc.descriptionMomentum and doping dependence of the static charge susceptibility χ(q) in the t-t'-J model is investigated. Correlations lead to a strongly momentum dependent renormalization of χ(q). The charge susceptibility near (π,π) region of the Brillouin zone is strongly suppressed as the hole density δis decreased. However, contrary to naive expectations, χ(q) around q = (π,0) and (0,π) remains large and practically unchanged at δ\sim 0.1-0.5. This effect is consistent with a tendency towards low-energy charge fluctuations with the wave vectors along the Γ-X direction, reported in earlier studies. Our main finding is that the above trends are amplified by J-driven pairing effects, indicating that the pseudogap formation may promote the charge inhomogeneity. The next-nearest hopping t' leads to weakening of the above momentum-selective renormalizations of χ(q). We analyze the effects of long-range Coulomb interaction, taking into account a layered structure of cuprates. As an application, the results are discussed in the context of bond-stretching phonon softening in hole-doped cuprates. In particular, a peculiar doping and momentum dependence of the electron-phonon coupling constant is found.
dc.description12 pages, 11 figures, references added, explanations provided on the meaning and limitations of our formalism
dc.identifierhttps://arxiv.org/abs/cond-mat/0603161
dc.identifierhttp://arxiv.org/abs/cond-mat/0603161
dc.identifierPhys. Rev. B 74, 045124 (2006)
dc.identifierdoi:10.1103/PhysRevB.74.045124
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/108518
dc.subjectStrongly Correlated Electrons
dc.titleCharge susceptibility in the t-J model
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