Parquet dual fermion approach for the Falicov-Kimball model

@article{Astleithner2019ParquetDF,
  title={Parquet dual fermion approach for the Falicov-Kimball model},
  author={Katharina Astleithner and Anna Kauch and Tin Ribic and Karsten Held},
  journal={Physical Review B},
  year={2019}
}
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… 

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