{
  "id": "1711.01474",
  "version": "v1",
  "published": "2017-11-04T18:36:44.000Z",
  "updated": "2017-11-04T18:36:44.000Z",
  "title": "Hyperfine-phonon spin relaxation in a single-electron GaAs quantum dot",
  "authors": [
    "Leon C. Camenzind",
    "Liuqi Yu",
    "Peter Stano",
    "Jeramy Zimmerman",
    "Arthur C. Gossard",
    "Daniel Loss",
    "Dominik M. Zumbühl"
  ],
  "comment": "7 pages, 4 (color) figures",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "Understanding and control of the spin relaxation time $T_1$ is among the key challenges for spin based qubits. A larger $T_1$ is generally favored, setting the fundamental upper limit to the qubit coherence and spin readout fidelity. In GaAs quantum dots at low temperatures and high in-plane magnetic fields $B$, the spin relaxation relies on phonon emission and spin-orbit coupling. The characteristic dependence $T_1 \\propto B^{-5}$ and pronounced $B$-field anisotropy were already confirmed experimentally. However, it has also been predicted 15 years ago that at low enough fields, the spin-orbit interaction is replaced by the coupling to the nuclear spins, where the relaxation becomes isotropic, and the scaling changes to $T_1 \\propto B^{-3}$. We establish these predictions experimentally, by measuring $T_1$ over an unprecedented range of magnetic fields -- made possible by lower temperature -- and report a maximum $T_1 = 57\\pm15$ s at the lowest fields, setting a new record for the electron spin lifetime in a nanostructure.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2017-11-04T18:36:44.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "single-electron gaas quantum dot",
      "hyperfine-phonon spin relaxation",
      "high in-plane magnetic fields",
      "spin readout fidelity",
      "fundamental upper limit"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 7,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}