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

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

2007-04-11

arxiv.org/abs/0704.1434v2

Phys. Rev. B 76, 155102 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

added figures, improved discussion

Scientific paper

10.1103/PhysRevB.76.155102

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. Non-diagonal 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).

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