{
  "id": "2001.07929",
  "version": "v1",
  "published": "2020-01-22T09:38:04.000Z",
  "updated": "2020-01-22T09:38:04.000Z",
  "title": "Fine structure of negatively charged and neutral excitons in monolayer MoS$_{2}$",
  "authors": [
    "Joanna Jadczak",
    "Joanna Kutrowska-Girzycka",
    "Maciej Bieniek",
    "Tomasz Kazimierczuk",
    "Piotr Kossacki",
    "Kenji Watanabe",
    "Takashi Taniguchi",
    "Ching-Hwa Ho",
    "Arkadiusz Wójs",
    "Paweł Hawrylak",
    "Leszek Bryja"
  ],
  "categories": [
    "cond-mat.mes-hall",
    "cond-mat.mtrl-sci"
  ],
  "abstract": "We present experimental and theoretical results on the high-quality single-layer MoS$_{2}$ which reveal the fine structure of charged excitons, i.e., trions. In the emission spectra we resolve and identify two trion peaks, T$_{1}$ and T$_{2}$, resembling the pair of singlet and triplet trion peaks (T$_S$ and T$_{T}$) in tungsten-based materials. However, in polarization-dependent photoluminescence measurements we identify these peaks as novel intra- and inter-valley singlet trions, constituting the trion fine structure distinct from that already known in bright and dark 2D materials with large conduction-band splitting induced by the spin-orbit coupling. We show that the trion energy splitting in MoS$_{2}$ is a sensitive probe of inter- and intra-valley carrier interaction. With additional support from theory we claim that the existence of these singlet trions combined with an anomalous excitonic g-factor and the characteristic temperature dependence of the emission spectra together suggest that monolayer MoS$_{2}$ has a dark excitonic ground state, despite having \"bright\" single-particle arrangement of spin-polarized conduction bands.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2020-01-22T09:38:04.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "monolayer mos",
      "neutral excitons",
      "dark excitonic ground state",
      "trion fine structure distinct",
      "emission spectra"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}