{
  "id": "2204.01025",
  "version": "v1",
  "published": "2022-04-03T08:19:56.000Z",
  "updated": "2022-04-03T08:19:56.000Z",
  "title": "Trion-trion annihilation in monolayer WS$_2$",
  "authors": [
    "Suman Chatterjee",
    "Garima Gupta",
    "Sarthak Das",
    "Kenji Watanabe",
    "Takashi Taniguchi",
    "Kausik Majumdar"
  ],
  "journal": "Phys. Rev. B 105, L121409, 2022",
  "doi": "10.1103/PhysRevB.105.L121409",
  "categories": [
    "cond-mat.mes-hall",
    "cond-mat.mtrl-sci",
    "physics.app-ph",
    "physics.optics"
  ],
  "abstract": "Strong Coulomb interaction in monolayer transition metal dichalcogenides can facilitate nontrivial many-body effects among excitonic complexes. Many-body effects like exciton-exciton annihilation (EEA) have been widely explored in this material system. However, a similar effect for charged excitons (or trions), that is, trion-trion annihilation (TTA), is expected to be relatively suppressed due to repulsive like-charges, and has not been hitherto observed in such layered semiconductors. By a gate-dependent tuning of the spectral overlap between the trion and the charged biexciton through an \"anti-crossing\"-like behaviour in monolayer WS$_2$, here we present an experimental observation of an anomalous suppression of the trion emission intensity with an increase in gate voltage. The results strongly correlate with time-resolved measurements, and are inferred as a direct evidence of a nontrivial TTA resulting from non-radiative Auger recombination of a bright trion, and the corresponding energy resonantly promoting a dark trion to a charged biexciton state. The extracted Auger coefficient for the process is found to be tunable ten-fold through a gate-dependent tuning of the spectral overlap.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2022-04-03T08:19:56.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "monolayer ws",
      "trion-trion annihilation",
      "monolayer transition metal dichalcogenides",
      "spectral overlap",
      "facilitate nontrivial many-body effects"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}