{
  "id": "1705.10429",
  "version": "v1",
  "published": "2017-05-30T01:49:48.000Z",
  "updated": "2017-05-30T01:49:48.000Z",
  "title": "Engineering of Neutral Excitons and Exciton Complexes in Transition Metal Dichalcogenide Monolayers through External Dielectric Screening",
  "authors": [
    "Sven Borghardt",
    "Jhih-Sian Tu",
    "Florian Winkler",
    "Jürgen Schubert",
    "Willi Zander",
    "Kristján Lesson",
    "Beata E. Kardynał"
  ],
  "comment": "11 pages + 6 pages supporting information",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "In order to fully exploit the potential of transition metal dichalcogenide monolayers (TMD-MLs), the well-controlled creation of atomically sharp lateral heterojunctions within these materials is highly desirable. A promising approach to create such heterojunctions is the local modulation of the electronic structure of an intrinsic TMD-ML via dielectric screening induced by its surrounding materials. For the realization of this non-invasive approach, an in-depth understanding of such dielectric effects is required. We report on the modulations of excitonic transitions in TMD-MLs through the effect of dielectric environments including low-k and high-k dielectric materials. We present absolute tuning ranges as large as 37 meV for the optical band gaps of WSe 2 and MoSe 2 MLs and relative tuning ranges on the order of 30% for the binding energies of neutral excitons in WSe 2 MLs. The findings suggest the possibility to reduce the electronic band gap of WSe 2 MLs by 120 meV, paving the way towards dielectrically defined lateral heterojunctions.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2017-05-30T01:49:48.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "transition metal dichalcogenide monolayers",
      "neutral excitons",
      "external dielectric screening",
      "exciton complexes",
      "band gap"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 11,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}