{
  "id": "2212.06484",
  "version": "v1",
  "published": "2022-12-13T11:10:55.000Z",
  "updated": "2022-12-13T11:10:55.000Z",
  "title": "Josephson current via spin and orbital states of a tunable double quantum dot",
  "authors": [
    "Rousan Debbarma",
    "Markus Aspegren",
    "Florinda Viñas Boström",
    "Sebastian Lehmann",
    "Kimberly Dick",
    "Claes Thelander"
  ],
  "journal": "Phys. Rev. B 106, L180507, 2022",
  "doi": "10.1103/PhysRevB.106.L180507",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "Supercurrent transport is experimentally studied in a Josephson junction hosting a double quantum dot (DQD) with tunable symmetries. The QDs are parallel-coupled to two superconducting contacts and can be tuned between strong inter-dot hybridization and a ring geometry where hybridization is suppressed. In both cases, we observe supercurrents when the two interacting orbitals are either empty or filled with spins, or a combination. However, when each QD hosts an unpaired spin, the supercurrent depends on the spin ground state. It is strongly suppressed for the ring geometry with a spin-triplet ground state at zero external magnetic field. By increasing the QD hybridization, we find that a supercurrent appears when the ground state changes to spin-singlet. In general, supercurrents are suppressed in cases of spin doublet ground state, but an exception occurs at orbital degeneracy when the system hosts one additional spin, as opposed to three, pointing to a broken particle-hole symmetry.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2022-12-13T11:10:55.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "tunable double quantum dot",
      "josephson current",
      "orbital states",
      "supercurrent",
      "zero external magnetic field"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}