{
  "abstract": "We reveal a strongly anisotropic excitonic landscape in monolayer and bulk-like CrSBr using optical absorption spectroscopy and $GW$-Bethe-Salpeter equation $\\textit{ab initio}$ calculations. The direct absorptive determination of the lowest bright optical onsets i.e. $X_0^a$ and $X_0^b$ excitons for the two in-plane polarization eigenaxes yield an in-plane optical gap anisotropy of $470 \\pm 15$ meV. This is the highest observed value for any material in the near-infrared-to-visible spectral region to the best of our knowledge. Energetically above, we identify multiple strongly polarized excitons spanning $1.25$ eV to $3.1$ eV selectively aligned along the two orthogonal axes. A resonance $X^-$, located $24$ meV below the $X_0^b$ progressively transfers oscillator strength to $X_b^0$, a behavior consistent with a coupled trion (Fermi-polarion)/exciton pair. Our experiments also provide polarization-resolved broadband dielectric functions of CrSBr. These results establish CrSBr as a strongly polarization-selective excitonic system and highlight its potential for polarization-selective optoelectronics enabled with its large optical-gap anisotropy.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2608.29566",
  "author_total": 11,
  "authors": [
    {
      "name": "Sayantan Patra"
    },
    {
      "name": "Sourabh Jain"
    },
    {
      "name": "Bhumika Chauhan"
    },
    {
      "name": "Marie-Christin Heißenbüttel"
    },
    {
      "name": "Abhisek Saidarsan"
    },
    {
      "name": "Ranjuna M. K."
    },
    {
      "name": "Kseniia Mosina"
    },
    {
      "name": "Zdeněk Sofer"
    },
    {
      "name": "Michael Rohlfing"
    },
    {
      "name": "Thorsten Deilmann"
    },
    {
      "name": "Ashish Arora"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/eeap0ajt2043e.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2608.29566",
  "fulltext_url": null,
  "id": "eeap0ajt2043e",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2608.29566",
  "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"
    ],
    [
      "openalex",
      "2505|2D Materials and Applications"
    ]
  ],
  "openalex": "W7204885730",
  "pdf_url": "https://arxiv.org/pdf/2608.29566",
  "pmcid": null,
  "pmid": null,
  "published": "2026-08-30",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/eeap0ajt2043e.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:41Z",
      "native_id": "2608.29566",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2608.29566"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mes-hall",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Extreme Polarization of the Optical Gap and High-Energy Exciton Landscape in CrSBr",
  "title_text": "Extreme Polarization of the Optical Gap and High-Energy Exciton Landscape in CrSBr",
  "type": "preprint",
  "updated_at": "2026-10-30T12:17:41Z",
  "url": "https://research.draconitic.com/paper/eeap0ajt2043e",
  "venue": "arXiv",
  "versions": []
}