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- W3047875061 abstract "We present and implement a parquet approximation within the dual-fermion formalism based on a partial bosonization of the dual vertex function which substantially reduces the computational cost of the calculation. The method relies on splitting the vertex exactly into single-boson exchange contributions and a residual four-fermion vertex, which physically embody respectively long-range and short-range spatial correlations. After recasting the parquet equations in terms of the residual vertex, these are solved using the truncated unity method of Eckhardt et al. [Phys. Rev. B 101, 155104 (2020)], which allows for a rapid convergence with the number of form factors in different regimes. While our numerical treatment of the parquet equations can be restricted to only a few Matsubara frequencies, reminiscent of Astretsov et al. [Phys. Rev. B 101, 075109 (2020)], the one- and two-particle spectral information is fully retained. In applications to the two-dimensional Hubbard model the method agrees quantitatively with a stochastic summation of diagrams over a wide range of parameters." @default.
- W3047875061 created "2020-08-13" @default.
- W3047875061 creator A5016192597 @default.
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- W3047875061 creator A5057489212 @default.
- W3047875061 creator A5072510071 @default.
- W3047875061 creator A5087010021 @default.
- W3047875061 date "2020-11-18" @default.
- W3047875061 modified "2023-10-17" @default.
- W3047875061 title "Boson-exchange parquet solver for dual fermions" @default.
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