Parquet dual fermion approach for the Falicov-Kimball model

Abstract

In the Falicov-Kimball model, a model for (annealed) disorder, we expect weak localization corrections to the optical conductivity. However, we get such weak localization effects only when employing a pp-ladder approximation in the dual fermion approach. In the full parquet approach these pp-contributions are suppressed by ph-reducible diagrams. For the optical conductivity, we find that the pht-channel yields the main contribution, even in the region where weak localization in the pp-ladder was indicated.

11 pages, 17 figures

References in corpus (7)

• Dynamical vertex approximation - a step beyond dynamical mean field theory
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• Influence of Spatial Correlations in Strongly Correlated Electron Systems: Extension to Dynamical Mean Field Approximation
• Dual parquet scheme for the two-dimensional Hubbard model: modelling low-energy physics of high-$T_c$ cuprates with high momentum resolution
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• Extended Falicov-Kimball model: Exact solution for finite temperatures
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Cited by in corpus (14)

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• Single boson exchange representation of the functional renormalization group for strongly interacting many-electron systems
• Single-boson exchange functional renormalization group application to the two-dimensional Hubbard model at weak coupling
• Consistency of potential energy in the dynamical vertex approximation
• Second-order dual fermion for multi-orbital systems
• Extended Falicov-Kimball model: Hartree-Fock vs DMFT approach
• Displaced Drude peak from $\pi$-ton vertex corrections
• Broadening and sharpening of the Drude peak through antiferromagnetic fluctuations
• Extended Falicov-Kimball model at weak onsite and intersite Coulomb interactions
• Analytical expression for $\pi$-ton vertex contributions to the optical conductivity