{
  "id": "1305.3880",
  "version": "v2",
  "published": "2013-05-16T18:01:32.000Z",
  "updated": "2013-09-20T01:42:54.000Z",
  "title": "Bandgap Engineering of Strained Monolayer and Bilayer MoS2",
  "authors": [
    "Hiram J. Conley",
    "Bin Wang",
    "Jed I. Ziegler",
    "Richard F. Haglund Jr.",
    "Sokrates T. Pantelides",
    "Kirill I. Bolotin"
  ],
  "comment": "Article appears in print in Nanoletters",
  "journal": "Nano Letters, 2013, 13 (8), pp 3626-3630",
  "doi": "10.1021/nl4014748",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "We report the influence of uniaxial tensile mechanical strain in the range 0-2.2% on the phonon spectra and bandstructures of monolayer and bilayer molybdenum disulfide (MoS2) two-dimensional crystals. First, we employ Raman spectroscopy to observe phonon softening with increased strain, breaking the degeneracy in the E' Raman mode of MoS2, and extract a Gr\\\"uneisen parameter of ~1.06. Second, using photoluminescence spectroscopy we measure a decrease in the optical band gap of MoS2 that is roughly linear with strain, ~45 meV% strain for monolayer MoS2 and ~120 meV% strain for bilayer MoS2. Third, we observe a pronounced strain-induced decrease in the photoluminescence intensity of monolayer MoS2 that is indicative of the direct-to-indirect transition of the character of the optical band gap of this material at applied strain of ~1.5%, a value supported by first-principles calculations that include excitonic effects. These observations constitute the first demonstration of strain engineering the band structure in the emergent class of two-dimensional crystals, transition-metal dichalcogenides.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2013-09-20T01:42:54.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "bilayer mos2",
      "strained monolayer",
      "bandgap engineering",
      "optical band gap",
      "monolayer mos2"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "journal": "Nano Letters",
      "year": 2013,
      "month": "Aug",
      "volume": 13,
      "number": 8,
      "pages": 3626
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2013NanoL..13.3626C"
    }
  }
}