期刊
PHYSICAL REVIEW B
卷 102, 期 19, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.102.195131
关键词
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资金
- Slovenian Research Agency [N1-0088]
- Austrian Science Fund (FWF) [P31631, P32044, I 2794-N35]
- Ministero dell'Istruzione, dell'Universita e della Ricerca under PRIN
- H2020 Framework Programme, under ERC [692670]
- Austrian Science Fund (FWF) [P31631, P32044] Funding Source: Austrian Science Fund (FWF)
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- 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.
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