{
  "abstract": "Hydrodynamic corrections to diffusive transport can arise when momentum-conserving collisions between quasiparticles become prominent, and they have been documented for both electrons and phonons. An emerging frontier topic is coupled electron-phonon (e-ph) hydrodynamics. Here, through electrical and thermal transport measurements on TaAs2 crystals with different impurity levels, we document the emergence of an e-ph bifluid in the temperature window of 5 to 15 K. Within this range, the lattice thermal conductivity exhibits a faster-than-T^3 temperature dependence, as a consequence of non-monotonic and purity-dependent phonon mean free paths, a signature of phonon Poiseuille flow. However, strong e-ph coupling impedes the emergence of a ballistic regime. This is corroborated by the observation of quantum oscillations in the lattice thermal conductivity. Prominent phonon-mediated momentum exchange between electrons amplifies the violation of the Wiedemann-Franz law and yields a two-order-of-magnitude discrepancy between quantum and transport lifetimes, a signature of electron hydrodynamics in semimetals. Our results imply that in semimetals with optimized e-ph coupling, thanks to matching between the cryogenic phonon wave?length and the Fermi wavelength, momentum and energy flow between the electron and phonon reservoirs as frequently as within each reservoir.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.03517",
  "author_total": 5,
  "authors": [
    {
      "name": "Shan Jiang"
    },
    {
      "name": "Wei Xie"
    },
    {
      "name": "Xiaokang Li"
    },
    {
      "name": "Kamran Behnia"
    },
    {
      "name": "Zengwei Zhu"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/9w1xmwed1nx61.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.03517",
  "fulltext_url": null,
  "id": "9w1xmwed1nx61",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.03517",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "cond-mat.mtrl-sci"
    ],
    [
      "openalex",
      "2505|Thermal properties of materials"
    ]
  ],
  "openalex": "W7208790772",
  "pdf_url": "https://arxiv.org/pdf/2609.03517",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-03",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/9w1xmwed1nx61.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:31Z",
      "native_id": "2609.03517",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.03517"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Electron-phonon coupled hydrodynamics in semimetal TaAs_2",
  "title_text": "Electron-phonon coupled hydrodynamics in semimetal TaAs_2",
  "type": "preprint",
  "updated_at": "2026-10-30T12:18:31Z",
  "url": "https://research.draconitic.com/paper/9w1xmwed1nx61",
  "venue": "arXiv",
  "versions": []
}