The finite-difference parquet method: Enhanced electron–paramagnon scattering opens a pseudogap
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.
Fields of Study & Subjects
Semiconductor materials and devices
Optical Coatings and Gratings
Electron and X-Ray Spectroscopy Techniques
Publication details
- Journal / source
- Proceedings of the National Academy of Sciences
- Publisher
- National Academy of Sciences
- Volume
- 123
- Issue
- 10
- Pages
- e2525308123–e2525308123
- Publication date
- 3 March 2026
- Language
- EN