{
  "id": "2312.11698",
  "version": "v1",
  "published": "2023-12-18T20:52:52.000Z",
  "updated": "2023-12-18T20:52:52.000Z",
  "title": "Gate-defined superconducting channel in magic-angle twisted bilayer graphene",
  "authors": [
    "Giulia Zheng",
    "Elías Portolés",
    "Alexandra Mestre-Torá",
    "Marta Perego",
    "Takashi Taniguchi",
    "Kenji Watanabe",
    "Peter Rickhaus",
    "Folkert K. de Vries",
    "Thomas Ihn",
    "Klaus Ensslin",
    "Shuichi Iwakiri"
  ],
  "comment": "7 pages, 5 figures",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "Magic-angle twisted bilayer graphene (MATBG) combines in one single material different phases like insulating, metallic and superconducting. These phases and their in-situ tunability make MATBG an important platform for the fabrication of superconducting devices. We realize a split gate-defined geometry which enables us to tune the width of a superconducting channel formed in MATBG. We observe a smooth transition from superconductivity to highly resistive transport by progressively reducing the channel width using the split gates or by reducing the density in the channel. Using the gate-defined constriction, we control the flow of the supercurrent, either guiding it through the constriction or throughout the whole device or even blocking its passage completely. This serves as a foundation for developing quantum constriction devices like superconducting quantum point contacts, quantum dots, and Cooper-pair boxes in MATBG.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2023-12-18T20:52:52.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "magic-angle twisted bilayer graphene",
      "gate-defined superconducting channel",
      "developing quantum constriction devices",
      "superconducting quantum point contacts",
      "single material"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 7,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}