{
  "abstract": "The type-II Dirac semimetals PtSe$_2$ and PtTe$_2$ are isostructural and isovalent layered compounds but exhibit distinct electronic properties. We measure the in-plane infrared reflectivity of bulk crystals between 10 and 300 K and compare the interband contribution to the optical conductivity with band-resolved density-functional calculations. At low temperature, the Drude spectral weight of PtTe$_2$ is an order of magnitude larger than that of PtSe$_2$. PtTe$_2$ also shows a broad mid-infrared absorption continuum, whereas the absorption of PtSe$_2$ remains weak. The calculations attribute this continuum to transitions from a predominantly chalcogen-$p$ band into a Pt-$d$ band. In PtTe$_2$, the chalcogen-$p$ band lies higher in energy, which lowers the onset of these transitions and increases the semimetallic band overlap, in line with the larger Drude spectral weight. The type-II Dirac points lie far below the Fermi level, so that transitions between the bands forming the Dirac cones do not contribute appreciably to the interband conductivity.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.30978",
  "author_total": 6,
  "authors": [
    {
      "name": "Ji Eun Lee"
    },
    {
      "name": "R. Mathew Roy"
    },
    {
      "name": "Premakumar Yanda"
    },
    {
      "name": "Chandra Shekhar"
    },
    {
      "name": "Claudia Felser"
    },
    {
      "name": "Martin Dressel"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/9x2qjdwbzfkvc.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.30978",
  "fulltext_url": null,
  "id": "9x2qjdwbzfkvc",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.30978",
  "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",
      "3107|Topological Materials and Phenomena"
    ]
  ],
  "openalex": "W7223277729",
  "pdf_url": "https://arxiv.org/pdf/2610.30978",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-22",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/9x2qjdwbzfkvc.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:34:34Z",
      "native_id": "2610.30978",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.30978"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Role of Chalcogen-p States in the Optical Response of Bulk PtSe2 and PtTe2",
  "title_text": "Role of Chalcogen-p States in the Optical Response of Bulk PtSe2 and PtTe2",
  "type": "preprint",
  "updated_at": "2026-10-30T12:34:34Z",
  "url": "https://research.draconitic.com/paper/9x2qjdwbzfkvc",
  "venue": "arXiv",
  "versions": []
}