{
  "id": "2410.01705",
  "version": "v2",
  "published": "2024-10-02T16:15:10.000Z",
  "updated": "2025-07-01T17:47:25.000Z",
  "title": "Pairing boost from enhanced spin-fermion coupling in the pseudogap regime",
  "authors": [
    "Yang Yu",
    "Sergei Iskakov",
    "Emanuel Gull",
    "Karsten Held",
    "Friedrich Krien"
  ],
  "comment": "7 pages, 2 figures",
  "categories": [
    "cond-mat.str-el",
    "cond-mat.supr-con"
  ],
  "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.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2025-07-01T17:47:25.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "pseudogap regime",
      "enhanced spin-fermion coupling",
      "pairing boost",
      "underdoped regime",
      "spin fluctuations open"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 7,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}