Effects of Boson Dispersion in Fermion-Boson Coupled Systems

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dc.creatorMotome, Yukitoshi
dc.creatorKotliar, Gabriel
dc.date2000-05-24
dc.date.accessioned2026-07-07T02:37:43Z
dc.date.available2026-07-07T02:37:43Z
dc.descriptionWe study the nonlinear feedback in a fermion-boson system using an extension of dynamical mean-field theory and the quantum Monte Carlo method. In the perturbative regimes (weak-coupling and atomic limits) the effective interaction among fermions increases as the width of the boson dispersion increases. In the strong coupling regime away from the anti-adiabatic limit, the effective interaction decreases as we increase the width of the boson dispersion. This behavior is closely related with complete softening of the boson field. We elucidate the parameters that control this nonperturbative region where fluctuations of the dispersive bosons enhance the delocalization of fermions.
dc.description14 pages RevTeX including 12 PS figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0005395
dc.identifierhttp://arxiv.org/abs/cond-mat/0005395
dc.identifierPhys. Rev. B 62, 12800 (2000)
dc.identifierdoi:10.1103/PhysRevB.62.12800
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/16396
dc.subjectStrongly Correlated Electrons
dc.titleEffects of Boson Dispersion in Fermion-Boson Coupled Systems
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