{
  "abstract": "Advances in modern electronics demand the dissipation of heat fluxes approaching 1000 W cm$^{-2}$, which drives an urgent need for materials with thermal conductivity ($κ$) exceeding 1000 W m$^{-1}$ K$^{-1}$. Here, by solving the Boltzmann transport equation considering both three- and four-phonon interactions, we observe that isotopically pure cubic germanium carbide (GeC) exhibits a remarkable $κ$ of 1018 W m$^{-1}$ K$^{-1}$ at room temperature, which is further corroborated by state-of-the-art machine-learning molecular dynamics simulations. Two unique mechanisms underlie this anomalously high $κ$: a remarkably strong isotopic enhancement effect (289%) and a surprisingly modest suppression due to four-phonon scattering (22%)-despite the presence of a wide acoustic-optical phonon gap. Moreover, we find that GeC defies the conventional Leibfried-Schlomann formula and exhibits a non-monotonic variation of $κ$ with external hydrostatic pressure at elevated temperatures. Our findings establish isotope-enriched GeC as a material of ultrahigh $κ$ and an ideal platform for exploring exotic phonon physics.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2611.06663",
  "author_total": 2,
  "authors": [
    {
      "name": "Wenjiang Zhou"
    },
    {
      "name": "Bai Song"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/2ncspcqk9rqgk.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2611.06663",
  "fulltext_url": null,
  "id": "2ncspcqk9rqgk",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2611.06663",
  "language": null,
  "licence": "CC-BY-NC-ND-4.0",
  "licence_label": "CC BY-NC-ND 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by-nc-nd/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "cond-mat.mtrl-sci"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2611.06663",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-04",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/2ncspcqk9rqgk.ris",
  "sources": [
    {
      "first_seen": "2026-11-05T15:20:56Z",
      "native_id": "2611.06663",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2611.06663"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Anomalous thermal transport in isotope-enriched germanium carbide",
  "title_text": "Anomalous thermal transport in isotope-enriched germanium carbide",
  "type": "preprint",
  "updated_at": "2026-11-09T00:20:20Z",
  "url": "https://research.draconitic.com/paper/2ncspcqk9rqgk",
  "venue": "arXiv",
  "versions": []
}