{
  "id": "2311.11867",
  "version": "v1",
  "published": "2023-11-20T16:04:50.000Z",
  "updated": "2023-11-20T16:04:50.000Z",
  "title": "Josephson junction π-0 transition induced by orbital hybridization in a double quantum dot",
  "authors": [
    "Rousan Debbarma",
    "Athanasios Tsintzis",
    "Markus Aspegren",
    "Rubén Seoane Souto",
    "Sebastian Lehmann",
    "Kimberly Dick",
    "Martin Leijnse",
    "Claes Thelander"
  ],
  "categories": [
    "cond-mat.mes-hall",
    "cond-mat.supr-con"
  ],
  "abstract": "In this work, we manipulate the phase shift of a Josephson junction using a parallel double quantum dot (QD). By employing a superconducting quantum interference device, we determine how orbital hybridization and detuning affect the current-phase relation in the Coulomb blockade regime. For weak hybridization between the QDs, we find $\\pi$ junction characteristics if at least one QD has an unpaired electron. Notably the critical current is higher when both QDs have an odd electron occupation. By increasing the inter-QD hybridization the critical current is reduced, until eventually a $\\pi$-0 transition occurs. A similar transition appears when detuning the QD levels at finite hybridization. Based on a zero-bandwidth model, we argue that both cases of phase-shift transitions can be understood considering an increased weight of states with a double occupancy in the ground state and with the Cooper pair transport dominated by local Andreev reflection.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2023-11-20T16:04:50.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "orbital hybridization",
      "josephson junction",
      "cooper pair transport",
      "similar transition appears",
      "odd electron occupation"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}