{
  "id": "2301.11138",
  "version": "v1",
  "published": "2023-01-26T14:41:55.000Z",
  "updated": "2023-01-26T14:41:55.000Z",
  "title": "Optical orientation of excitons in a longitudinal magnetic field in indirect band gap (In,Al)As/AlAs quantum dots with type-I band alignment",
  "authors": [
    "T. S. Shamirzaev",
    "A. V. Shumilin",
    "D. S. Smirnov",
    "D. Kudlacik",
    "S. V. Nekrasov",
    "Yu. G. Kusrayev",
    "D. R. Yakovlev",
    "M. Bayer"
  ],
  "comment": "17 pages, 11 figures",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "The exciton recombination and spin dynamics in (In,Al)As/AlAs quantum dots (QDs) with indirect band gap and type-I band alignment are studied. The negligible (less than $0.2~\\mu$eV) value of the anisotropic exchange interaction in these QDs prevents a mixing of the excitonic basis states with pure spin and allows for the formation of spin polarized bright excitons for quasi-resonant circularly polarized excitation. In a longitudinal magnetic field, the recombination and spin dynamics of the excitons are controlled by the hyperfine interaction between the electron and nuclear spins. A QD blockade by dark excitons is observed in magnetic field eliminating the impact of the nuclear spin fluctuations. A kinetic equation model, which accounts for the population dynamics of the bright and dark exciton states as well as for the spin dynamics, has been developed, which allows for a quantitative description of the experimental data.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2023-01-26T14:41:55.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "as/alas quantum dots",
      "longitudinal magnetic field",
      "indirect band gap",
      "type-i band alignment",
      "optical orientation"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 17,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}