The paper derives analytic corrections that let fermion-boson vertices and Bethe-Salpeter equations be solved with a small frequency box, improving convergence from 1/ν_max to 1/ν_max^4.
Interplay between magnetic and superconducting fluctuations in the doped 2d Hubbard model
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abstract
We study the Hubbard model on a square lattice, using the dynamical vertex approximation and the parquet approximation. These methods allow us to describe the mutual interference of spin-fluctuations in the particle-hole channel and superconducting fluctuations in the cooperon channel in an unbiased way. For small dopings we find predominant commensurable antiferromagnetic spin- and d-wave superconducting fluctuations; for larger doping incommensurate antiferromagnetic spin fluctuations are concomitant to triplet s-wave superconducting fluctuations.
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Improved treatment of fermion-boson vertices and Bethe-Salpeter equations in non-local extensions of dynamical mean field theory
The paper derives analytic corrections that let fermion-boson vertices and Bethe-Salpeter equations be solved with a small frequency box, improving convergence from 1/ν_max to 1/ν_max^4.