{
  "annotation_id": "46774e65-3717-4104-8bec-4d27146abe97",
  "date_created": "2026-02-17T05:53:12.479000Z",
  "date_modified": "2026-02-17T05:53:12.479000Z",
  "file_hash": "d5d40453508ed3c53027132b79fe8e3f37a7aa7972bf5cfaca3ff87be0355d7e",
  "private": false,
  "record": {
    "abstract": "We present direct experimental evidence of a weakly coupled multiband superconducting state in the bilayer iron-based superconductor ACa$_2$Fe$_4$As$_4$F$_2$ (A = K, Cs) via ultrahigh-resolution angle-resolved photoemission spectroscopy (ARPES). Remarkably, the K-containing compound exhibits two distinct transition temperatures, corresponding to two separate sets of bilayer-split bands, as evidenced by temperature-dependent superconducting gap and spectral weight near the Fermi energy, while its Cs counterpart displays conventional single transition behavior. These experimental observations are well described by the weakly coupled two-band model of Eilenberger theory, which identifies suppressed interband pairing interactions between the bilayer-split bands as the key mechanism. By exploring quantum phenomena in the weak-coupling limit within a multiband system, our findings pave the way for engineering exotic superconductivity via band-selective pairing control.",
    "arxiv_id": "2601.07380",
    "authors": [
      "Shichong Wang",
      "Yuanyuan Yang",
      "Yang Li",
      "Wenshan Hong",
      "Huaxun Li",
      "Shaofeng Duan",
      "Lingxiao Gu",
      "Haoran Liu",
      "Jiongyu Huang",
      "Jianzhe Liu",
      "Dong Qian",
      "Guanghan Cao",
      "Huiqian Luo",
      "Wentao Zhang"
    ],
    "categories": [
      "cond-mat.supr-con",
      "cond-mat.str-el"
    ],
    "doi": "10.1103/vy32-xtt9",
    "journal_ref": "Phys. Rev. B 113, L020502 (2026)",
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "title": "Decoupled interband pairing in a bilayer iron-based superconductor evidenced by ultrahigh-resolution ARPES",
    "url": "https://arxiv.org/abs/2601.07380",
    "version": "v1"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "6b37ab7a-aa05-4f07-92ff-97af3d298559",
    "id": "arXiv Dataset",
    "type": "Model",
    "variant": "snapshot-2026-01-17",
    "version": "0.1.0"
  },
  "user_id": 1000002
}