{
  "id": "1904.04711",
  "version": "v1",
  "published": "2019-04-09T14:46:49.000Z",
  "updated": "2019-04-09T14:46:49.000Z",
  "title": "Phonon-assisted Photoluminescence from Dark Excitons in Monolayers of Transition Metal Dichalcogenides",
  "authors": [
    "Samuel Brem",
    "August Ekman",
    "Dominik Christiansen",
    "Florian Katsch",
    "Malte Selig",
    "Cedric Robert",
    "Xavier Marie",
    "Bernhard Urbaszek",
    "Andreas Knorr",
    "Ermin Malic"
  ],
  "categories": [
    "cond-mat.mes-hall",
    "cond-mat.mtrl-sci"
  ],
  "abstract": "The photoluminescence (PL) spectrum of transition metal dichalcogenides (TMDs) shows a multitude of emission peaks below the bright exciton line and not all of them have been explained yet. Here, we study the emission traces of phonon-assisted recombinations of momentum-dark excitons. To this end, we develop a microscopic theory describing simultaneous exciton, phonon and photon interaction and including consistent many-particle dephasing. We explain the drastically different PL below the bright exciton in tungsten- and molybdenum-based materials as result of different configurations of bright and dark states. In good agreement with experiments, we show that WSe$_2$ exhibits clearly visible low-temperature PL signals stemming from the phonon-assisted recombination of momentum-dark excitons.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2019-04-09T14:46:49.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "transition metal dichalcogenides",
      "phonon-assisted photoluminescence",
      "visible low-temperature pl signals",
      "low-temperature pl signals stemming",
      "bright exciton"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}