Pairing boost from enhanced spin-fermion coupling in the pseudogap regime
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arXiv
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| Hauptverfasser: | , , , , |
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| Format: | Preprint |
| Veröffentlicht: |
2024
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| _version_ | 1866908443657371648 |
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| author | Yu, Yang Iskakov, Sergei Gull, Emanuel Held, Karsten Krien, Friedrich |
| author_facet | Yu, Yang Iskakov, Sergei Gull, Emanuel Held, Karsten Krien, Friedrich |
| contents | We perform a fluctuation analysis of the pairing interaction in the hole-doped Hubbard model within the dynamical cluster approximation. Our analysis reveals that spin-fluctuation-mediated pairing differs qualitatively in the over- and underdoped regimes. In the underdoped regime, spin fluctuations open a pseudogap. We show that in this regime the spin-fermion coupling mediates a giant attraction between antinodal fermions. This explains why superconductivity survives at underdoping in the Hubbard model and cuprates, despite the lack of coherent fermionic quasiparticles in the pseudogap regime. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_01705 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Pairing boost from enhanced spin-fermion coupling in the pseudogap regime Yu, Yang Iskakov, Sergei Gull, Emanuel Held, Karsten Krien, Friedrich Strongly Correlated Electrons Superconductivity We perform a fluctuation analysis of the pairing interaction in the hole-doped Hubbard model within the dynamical cluster approximation. Our analysis reveals that spin-fluctuation-mediated pairing differs qualitatively in the over- and underdoped regimes. In the underdoped regime, spin fluctuations open a pseudogap. We show that in this regime the spin-fermion coupling mediates a giant attraction between antinodal fermions. This explains why superconductivity survives at underdoping in the Hubbard model and cuprates, despite the lack of coherent fermionic quasiparticles in the pseudogap regime. |
| title | Pairing boost from enhanced spin-fermion coupling in the pseudogap regime |
| topic | Strongly Correlated Electrons Superconductivity |
| url | https://arxiv.org/abs/2410.01705 |