Rotationally invariant slave-boson formalism and momentum dependence of the quasiparticle weight

Frank Lechermann, Antoine Georges, Gabriel Kotliar, Olivier Parcollet

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110 Scopus citations

Abstract

We generalize the rotationally invariant formulation of the slave-boson formalism to multiorbital models, with arbitrary interactions, crystal fields, and multiplet structure. This allows for the study of multiplet effects on the nature of low-energy quasiparticles. Nondiagonal components of the matrix of quasiparticle weights can be calculated within this framework. When combined with cluster extensions of dynamical mean-field theory, this method allows us to address the effects of spatial correlations, such as the generation of the superexchange and the momentum dependence of the quasiparticle weight. We illustrate the method on a two-band Hubbard model, a Hubbard model made of two coupled layers, and a two-dimensional single-band Hubbard model (within a two-site cellular dynamical mean-field approximation).

Original languageEnglish (US)
Article number155102
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume76
Issue number15
DOIs
StatePublished - Oct 1 2007

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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