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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2505.20116 |
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| _version_ | 1866917319885717504 |
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| author | Lihm, Jae-Mo Kiese, Dominik Lee, Seung-Sup B. Kugler, Fabian B. |
| author_facet | Lihm, Jae-Mo Kiese, Dominik Lee, Seung-Sup B. Kugler, Fabian B. |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_20116 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The finite-difference parquet method: Enhanced electron-paramagnon scattering opens a pseudogap Lihm, Jae-Mo Kiese, Dominik Lee, Seung-Sup B. Kugler, Fabian B. Strongly Correlated Electrons 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. |
| title | The finite-difference parquet method: Enhanced electron-paramagnon scattering opens a pseudogap |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2505.20116 |