{
  "id": "2106.15973",
  "version": "v1",
  "published": "2021-06-30T10:40:17.000Z",
  "updated": "2021-06-30T10:40:17.000Z",
  "title": "Microscopic Theory of Exciton-Exciton Annihilation in Two-Dimensional Semiconductors",
  "authors": [
    "Alexander Steinhoff",
    "Matthias Florian",
    "Frank Jahnke"
  ],
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "Auger-like exciton-exciton annihilation (EEA) is considered the key fundamental limitation to quantum yield in devices based on excitons in two-dimensional (2d) materials. Since it is challenging to experimentally disentangle EEA from competing processes, guidance of a quantitative theory is highly desirable. The very nature of EEA requires a material-realistic description that is not available to date. We present a many-body theory of EEA based on first-principle band structures and Coulomb interaction matrix elements that goes beyond an effective bosonic picture. Applying our theory to monolayer MoS$_2$ encapsulated in hexagonal BN, we obtain an EEA coefficient in the order of $10^{-3}$ cm$^{2}$s$^{-1}$ at room temperature, suggesting that exciton annihilation is often dominated by other processes, such as defect-assisted scattering. Our studies open a perspective to quantify the efficiency of intrinsic EEA processes in various 2d materials in the focus of modern materials research.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2021-06-30T10:40:17.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "microscopic theory",
      "two-dimensional semiconductors",
      "coulomb interaction matrix elements",
      "intrinsic eea processes",
      "first-principle band structures"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}