{
  "id": "2203.02081",
  "version": "v1",
  "published": "2022-03-04T01:03:11.000Z",
  "updated": "2022-03-04T01:03:11.000Z",
  "title": "Twisted-light-induced exciton wave packets in transition-metal dichalcogenide monolayers",
  "authors": [
    "Guan-Hao Peng",
    "Oscar Javier Gomez Sanchez",
    "Wei-Hua Li",
    "Ping-Yuan Lo",
    "Shun-Jen Cheng"
  ],
  "comment": "33 pages, 10 figures",
  "categories": [
    "cond-mat.mes-hall",
    "quant-ph"
  ],
  "abstract": "We present a comprehensive theoretical investigation of the photo-generated excitons in transition-metal dichalcogenide monolayers (TMD-ML's) by Laguerre-Gaussian beams, a celebrated kind of twisted lights (TL's) carrying quantized orbital angular momenta (OAM). We show that the photo-excitation of TL incident to a TMD-ML leads to the formation of spatially localized exciton wave packets, constituted by the superposition of finite-momentum exciton states determined by the intriguing interplay between the multiple degrees of freedom of the optical and excitonic subsystems. Consequently, the TL-induced exciton wave packets yield profound directional photo-luminescences whose polar-angle-dependences are encoded by the transferred optical OAM and azimuthal angle part, despite OAM-irrelevant, optically resolves the exchange-split longitudinal and transverse exciton bands. Interestingly, the application of linearly polarized TL onto a valley-excitonic system mimics an exciton multiplexer allowing for selectively detecting the individual valley-mixed exciton bands, which are normally hardly measured spectrally.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2022-03-04T01:03:11.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "transition-metal dichalcogenide monolayers",
      "twisted-light-induced exciton wave packets",
      "packets yield profound directional",
      "yield profound directional photo-luminescences",
      "wave packets yield profound"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 33,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}