{
  "abstract": "The interplay between dimensionality, band-edge electronic structure, and electron-hole interactions governs the optical response of low-dimensional tellurium, yet the microscopic origin of its excitonic behavior remains largely unexplored. Here, we investigate the quasiparticle, excitonic, and optical properties of two-dimensional tellurium polymorphs and one-dimensional helical nanowires using many-body GW and the Bethe--Salpeter equation. Our results reveal a strong dependence of the excitonic response on band-edge dispersion, crystal symmetry, and dimensional confinement. $α$-tellurene exhibits comparatively weak and spatially extended electron-hole correlations, whereas the SOC-induced quasi-flat band-edge states of $β$-tellurene give rise to a strongly bound and anisotropic near-infrared exciton. Momentum-resolved BSE eigenvectors and real-space exciton wave functions directly reveal the contrasting localization and anisotropy of these excitonic states. Remarkably, hydrogen-passivated hexagonal tellurene, previously identified as a quantum spin Hall phase with $Z_2=1$, supports an even larger direct exciton binding energy of 0.51 eV together with a compact and nearly isotropic in-plane excitonic distribution. This demonstrates that strong electron-hole correlations are fully compatible with nontrivial band topology, while the binding strength and spatial character of the exciton remain strongly dependent on the underlying band-edge electronic structure and crystal symmetry. The one-dimensional helical nanowire represents the strong-confinement limit, exhibiting a direct high exciton binding energy and a pronounced shift of the optical response toward the ultraviolet.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2608.28861",
  "author_total": 3,
  "authors": [
    {
      "name": "Gabriel Elyas Gama Araujo"
    },
    {
      "name": "Alexandre Cavalheiro Dias"
    },
    {
      "name": "Andreia Luisa da Rosa"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/5mycvj5eatxt7.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2608.28861",
  "fulltext_url": null,
  "id": "5mycvj5eatxt7",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2608.28861",
  "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.mtrl-sci"
    ],
    [
      "openalex",
      "2505|2D Materials and Applications"
    ]
  ],
  "openalex": "W7204890468",
  "pdf_url": "https://arxiv.org/pdf/2608.28861",
  "pmcid": null,
  "pmid": null,
  "published": "2026-08-28",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/5mycvj5eatxt7.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:41Z",
      "native_id": "2608.28861",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2608.28861"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Engineering Excitons through Polymorphism and Dimensional Confinement in Low-Dimensional Tellurium",
  "title_text": "Engineering Excitons through Polymorphism and Dimensional Confinement in Low-Dimensional Tellurium",
  "type": "preprint",
  "updated_at": "2026-10-30T12:17:41Z",
  "url": "https://research.draconitic.com/paper/5mycvj5eatxt7",
  "venue": "arXiv",
  "versions": []
}