{
  "abstract": "Dark excitons play a central role in the nonequilibrium dynamics of two-dimensional semiconductors, but remain difficult to characterize. Transient-absorption experiments, with probes tuned in exciton-exciton transitions energy range (exc-tr-abs), can detect excitations from any populated dark excitons, including symmetry-forbidden, spin-forbidden, and finite-momentum ones. In this work, we develop a $GW$+BSE scheme for computing exc-tr-abs spectra from arbitrary populated exciton distributions. These dark excitons are included equally by evaluating exciton-exciton dipoles in a locally smooth gauge, including intra- and inter-band contributions. For monolayer MoS$_2$, the exc-tr-abs signal arises from the $Γ$, $K$, $M$, and $Q$ valleys, differing substantially from the $Γ$-only interpretation. Exciton-exciton dipoles show similar intensities across these valleys, while their weights are dictated by initial excitonic populations. State- and spin-resolved analyses assign the peaks to $1s \\rightarrow 2p$ and $1s \\rightarrow 3p$ transitions from both spin-flip and spin-conserving A and B excitons across valleys and momenta.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2608.30504",
  "author_total": 6,
  "authors": [
    {
      "name": "Tian-Xiang Qian"
    },
    {
      "name": "Marco d'Alessandro"
    },
    {
      "name": "Claudio Attaccalite"
    },
    {
      "name": "Tian-Yi Cai"
    },
    {
      "name": "Sheng Ju"
    },
    {
      "name": "Davide Sangalli"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/76f2grrhq5pwx.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2608.30504",
  "fulltext_url": null,
  "id": "76f2grrhq5pwx",
  "issns": [],
  "landing_url": "https://hal.science/hal-05739942v1",
  "language": "en",
  "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.mtrl-sci"
    ],
    [
      "arxiv",
      "physics.comp-ph"
    ],
    [
      "hal",
      "0.phys"
    ],
    [
      "hal",
      "1.phys.cond"
    ],
    [
      "openalex",
      "2505|2D Materials and Applications"
    ]
  ],
  "openalex": "W7204957816",
  "pdf_url": "https://arxiv.org/pdf/2608.30504",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-02",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/76f2grrhq5pwx.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:29Z",
      "native_id": "hal-05739942",
      "source": "hal",
      "url": "https://hal.science/hal-05739942v1"
    },
    {
      "first_seen": "2026-10-30T12:18:16Z",
      "native_id": "2608.30504",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2608.30504"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.comp-ph",
      "subfield": "computational"
    },
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Dark exciton signatures in the infrared transient absorption of MoS$_2$ monolayer",
  "title_text": "Dark exciton signatures in the infrared transient absorption of MoS_2 monolayer",
  "type": "preprint",
  "updated_at": "2026-10-30T12:18:16Z",
  "url": "https://research.draconitic.com/paper/76f2grrhq5pwx",
  "venue": "HAL",
  "versions": []
}