Phonon-mediated tuning of instabilities in the Hubbard model at half-filling

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dc.creatorKlironomos, F. D.
dc.creatorTsai, S. -W.
dc.date2006-04-15
dc.date2006-09-10
dc.date.accessioned2026-07-07T07:05:32Z
dc.date.available2026-07-07T07:05:32Z
dc.descriptionWe obtain the phase diagram of the half-filled two-dimensional Hubbard model on a square lattice in the presence of Einstein phonons. We find that the interplay between the instantaneous electron-electron repulsion and electron-phonon interaction leads to new phases. In particular, a d$_{x^2-y^2}$-wave superconducting phase emerges when both anisotropic phonons and repulsive Hubbard interaction are present. For large electron-phonon couplings, charge-density-wave and s-wave superconducting regions also appear in the phase diagram, and the widths of these regions are strongly dependent on the phonon frequency, indicating that retardation effects play an important role. Since at half-filling the Fermi surface is nested, spin-density-wave is recovered when the repulsive interaction dominates. We employ a functional multiscale renormalization-group method that includes both electron-electron and electron-phonon interactions, and take retardation effects fully into account.
dc.description8 pages, 5 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0604386
dc.identifierhttp://arxiv.org/abs/cond-mat/0604386
dc.identifierPhys. Rev. B 74, 205109 (2006)
dc.identifierdoi:10.1103/PhysRevB.74.205109
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/109703
dc.subjectStrongly Correlated Electrons
dc.titlePhonon-mediated tuning of instabilities in the Hubbard model at half-filling
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