{
  "abstract": "The spinterface model of chirality-induced spin selectivity supports two algebraically distinct near-exceptional-point (EP) regimes, which cannot be mixed. A \\emph{gold-level} near-EP involves the two gold spin states under an anti-Hermitian, electrode-mediated spin flip with spin-symmetric dissipative broadening (Scheme~B). A \\emph{chain-level} near-EP involves the collective coalescence of the two molecular eigenstates with largest weight on the first molecular site under a Hermitian on-site Rashba spin flip with spin-dependent broadening (Scheme~A). Mixing the diagonal cancellation of one scheme with the off-diagonal structure of the other yields a strictly negative discriminant and admits no EP on any parameter path, making the gold/chain classification exhaustive. At the gold near-EP the spin-flip coupling is chirality-selective, converting achiral spin-valve transport into purely chiral transport across well-defined crossover points. At the chain near-EP the Petermann factor grows as a power law in chain length, with an exponent tunable by the Rashba coherence length and non-monotonic in the Rashba strength, reflecting a balance between coherent enhancement and progressive breakdown of the Scheme-A condition. Both near-EPs are dressed versions of the ideal two-state EP, and the ratio between observed and bare EP locations measures the delocalisation of the coalescing pair, providing a fit-free diagnostic of the mechanism. These results identify CISS junctions as a solid-state platform for non-Hermitian spectral physics.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.37072",
  "author_total": 1,
  "authors": [
    {
      "name": "Seif Alwan"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/a72ww3kj2gwyy.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.37072",
  "fulltext_url": null,
  "id": "a72ww3kj2gwyy",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.37072",
  "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.mes-hall"
    ],
    [
      "openalex",
      "3107|Quantum Mechanics and Non-Hermitian Physics"
    ]
  ],
  "openalex": "W7224080722",
  "pdf_url": "https://arxiv.org/pdf/2610.37072",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-27",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/a72ww3kj2gwyy.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:35:50Z",
      "native_id": "2610.37072",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.37072"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mes-hall",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Two Exceptional-Point Regimes in the Spinterface Model of Chirality-Induced Spin Selectivity",
  "title_text": "Two Exceptional-Point Regimes in the Spinterface Model of Chirality-Induced Spin Selectivity",
  "type": "preprint",
  "updated_at": "2026-10-30T12:35:50Z",
  "url": "https://research.draconitic.com/paper/a72ww3kj2gwyy",
  "venue": "arXiv",
  "versions": []
}