Yu, Y., Iskakov, S., Gull, E., Held, K., & Krien, F. (2025). Pairing boost from enhanced spin-fermion coupling in the pseudogap regime. Physical Review B, 112(4), Article L041105. https://doi.org/10.1103/jbz7-wjtd
pseudogap; quantum entanglement; cuprates; Strongly correlated systems; Hubbard model
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Abstract:
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.
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Project title:
Elektronische Struktur und Supraleitung in Nickelaten: I 5398-N (FWF - Österr. Wissenschaftsfonds) Vertex-Korrekturen zur Leitfähigkeit: P 36213-N (FWF - Österr. Wissenschaftsfonds) Zentrum für korrelierte Quantenmaterialien und festkörperbasierte Quantensysteme: F 8600 (FWF - Österr. Wissenschaftsfonds) Quantum phase transitions and collective modes: I 5868-N (FWF - Österr. Wissenschaftsfonds)
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Research Areas:
Quantum Many-body Systems Physics: 50% Computational Materials Science: 50%
