The finite-difference parquet method: Enhanced electron-paramagnon scattering opens a pseudogap.
basic_science · Level V
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- Record sourced from PubMed, PMID 41774791.
- Also identified by DOI 10.1073/pnas.2525308123 and PMC identifier 12974451.
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Abstract
We present the finite-difference parquet method that greatly improves the applicability and accuracy of two-particle correlation approaches to interacting electron systems. This method incorporates the nonperturbative local physics from a reference solution and builds all parquet diagrams while circumventing potentially divergent irreducible vertices. Its unbiased treatment of different fluctuations is crucial for reproducing the strong-coupling pseudogap in the underdoped Hubbard model, consistent with diagrammatic Monte Carlo calculations. We reveal a strong-coupling spin-fluctuation mechanism of the pseudogap with decisive vertex corrections that encode the enhanced, energy-dependent scattering amplitude between electrons and antiferromagnetic spin fluctuations.