{
  "id": "1911.07639",
  "version": "v1",
  "published": "2019-11-18T13:52:02.000Z",
  "updated": "2019-11-18T13:52:02.000Z",
  "title": "Influence of non-equilibrium phonons on the spin dynamics of a single Cr atom",
  "authors": [
    "V. Tiwari",
    "K. Makita",
    "M. Arino",
    "M. Morita",
    "S. Kuroda",
    "H. Boukari",
    "L. Besombes"
  ],
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "We analyse the influence of optically generated non-equilibrium phonons on the spin relaxation and effective spin temperature of an individual Cr atom inserted in a quantum dot. Using a three pulses pump-probe technique, we show that the spin relaxation measured in resonant optical pumping experiments strongly depends on the optical excitation conditions. We observe for an isolated Cr in the dark a heating time shorter than a few hundreds $ns$ after an initial high power non-resonant excitation pulse. A cooling time larger than a few tens of $\\mu s$, independent on the excitation, is obtained in the same experimental conditions. We show that a tunable spin-lattice coupling dependent on the density of non-equilibrium phonons can explain the observed dynamics. Low energy excitation conditions are found where the Cr spin states S$_z$=$\\pm$1 can be efficiently populated by a non-resonant optical excitation, prepared and read-out by resonant optical pumping and conserved in the dark during a few $\\mu$s.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2019-11-18T13:52:02.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "non-equilibrium phonons",
      "single cr atom",
      "spin dynamics",
      "initial high power non-resonant excitation",
      "high power non-resonant excitation pulse"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}