{
  "abstract": "Fractional changes in entropy are often associated with strong electron correlations or non-Abelian anyons in topological systems. We show that neither condition is necessary -- a system of free electrons on a ring scattering off a repulsive point-like impurity undergoes a $k_B\\ln\\sqrt 2$ entropy change as the impurity strength is increased. This effect arises from a shift of allowed single-particle momenta from integer quantization to half-integer quantization, induced by the impurity. We show that this fractional entropy change is universal across a broad class of single-particle dispersions, demonstrating that such signatures can arise without strong correlations or topological order.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2608.29007",
  "author_total": 2,
  "authors": [
    {
      "name": "Syeda Neha Zaidi"
    },
    {
      "name": "Jukka I. Väyrynen"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/b2qrhpnwxvs9a.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2608.29007",
  "fulltext_url": null,
  "id": "b2qrhpnwxvs9a",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2608.29007",
  "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.mes-hall"
    ],
    [
      "openalex",
      "3107|Quantum and electron transport phenomena"
    ]
  ],
  "openalex": "W7204963519",
  "pdf_url": "https://arxiv.org/pdf/2608.29007",
  "pmcid": null,
  "pmid": null,
  "published": "2026-08-29",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/b2qrhpnwxvs9a.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:41Z",
      "native_id": "2608.29007",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2608.29007"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mes-hall",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Fractional Impurity Entropy from Potential Scattering in a Free Electron Gas",
  "title_text": "Fractional Impurity Entropy from Potential Scattering in a Free Electron Gas",
  "type": "preprint",
  "updated_at": "2026-10-30T12:17:41Z",
  "url": "https://research.draconitic.com/paper/b2qrhpnwxvs9a",
  "venue": "arXiv",
  "versions": []
}