{
  "abstract": "Magnetic fields are widely used to brighten spin-forbidden dark excitons, but the inverse effect on an optically bright exciton has remained largely unexplored. We demonstrate the complementary phenomenon of magnetic-field-induced darkening of a bright exciton in Mo$_{0.68}$W$_{0.32}$Se$_2$. At 4.2 K, an in-plane magnetic field up to 25 T activates a dark-exciton line 14.2$\\pm$1.3 meV below the bright exciton while suppressing the bright-exciton emission by about 85\\%. A bright-dark mixing model quantitatively captures the coupled energy and intensity evolution with an effective in-plane $g$ factor of $|g_{\\parallel}|=5.2\\pm0.2$. Alloying is crucial to the effect, as it brings the system close to the bright-dark crossover, where a small bright-dark splitting is combined with unusually strong in-plane magnetic coupling. This places the system in a regime where field-induced level repulsion raises the bright-like branch and strongly depletes its thermal population. These results identify a general route to magnetic control of exciton populations through engineering of the bright-dark hierarchy.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.27469",
  "author_total": 17,
  "authors": [
    {
      "name": "Katarzyna Olkowska-Pucko"
    },
    {
      "name": "Artur O. Slobodeniuk"
    },
    {
      "name": "Mehdi Arfaoui"
    },
    {
      "name": "Elena Blundo"
    },
    {
      "name": "Natalia Zawadzka"
    },
    {
      "name": "Łucja Kipczak"
    },
    {
      "name": "Jan Szpakowski"
    },
    {
      "name": "Diana Vaclavkova"
    },
    {
      "name": "Dipankar Jana"
    },
    {
      "name": "Piotr Kapuściński"
    },
    {
      "name": "Kenji Watanabe"
    },
    {
      "name": "Takashi Taniguchi"
    },
    {
      "name": "Clement Faugeras"
    },
    {
      "name": "Marek Potemski"
    },
    {
      "name": "Adam Babiński"
    },
    {
      "name": "Antonio Polimeni"
    },
    {
      "name": "Maciej R. Molas"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/1je64adygn84e.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.27469",
  "fulltext_url": null,
  "id": "1je64adygn84e",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.27469",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "cond-mat.mes-hall"
    ],
    [
      "arxiv",
      "cond-mat.mtrl-sci"
    ],
    [
      "openalex",
      "2505|2D Materials and Applications"
    ]
  ],
  "openalex": "W7223084995",
  "pdf_url": "https://arxiv.org/pdf/2610.27469",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-20",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/1je64adygn84e.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:34:04Z",
      "native_id": "2610.27469",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.27469"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mes-hall",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Magnetic-Field-Induced Darkening of Bright Excitons in a MoWSe$_2$ Monolayer Alloy",
  "title_text": "Magnetic-Field-Induced Darkening of Bright Excitons in a MoWSe_2 Monolayer Alloy",
  "type": "preprint",
  "updated_at": "2026-10-30T12:34:04Z",
  "url": "https://research.draconitic.com/paper/1je64adygn84e",
  "venue": "arXiv",
  "versions": []
}