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Pairing boost from enhanced spin-fermion coupling in the pseudogap regime

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arxiv 2410.01705 v2 pith:3S2X7FEA submitted 2024-10-02 cond-mat.str-el cond-mat.supr-con

Pairing boost from enhanced spin-fermion coupling in the pseudogap regime

Yang Yu , Sergei Iskakov , Emanuel Gull , Karsten Held , Friedrich Krien This is my paper
classification cond-mat.str-el cond-mat.supr-con
keywords regimepairingpseudogapanalysiscouplinghubbardmodelspin-fermion
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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  1. Superconductivity of Bad Fermions: Origin of Two Gaps in HTSC Cuprates

    cond-mat.str-el 2025-02 unverdicted novelty 6.0

    Strong-coupling expansion in the t-t' Hubbard model for cuprate parameters produces a d-wave anomalous Green's function whose extrema are shifted from the antinodes by pseudogap effects, yielding a two-gap electron spectrum.