{
  "abstract": "We present a fully quantum formulation of the spinterface model for the chirality-induced spin selectivity (CISS) effect, implemented within the non-equilibrium Green's function (NEGF) formalism. The model consists of a gold atom hosting a localised magnetic moment, coupled to a chiral molecular chain with Rashba spin-orbit coupling, and contacted by two non-magnetic leads. The magnetic moment is determined self-consistently from the non-equilibrium electronic distribution, and the spin-resolved transmission is computed from the mean-field Hamiltonian. We show that the interfacial magnetic moment and the chiral Rashba term cooperate to produce large current polarisations that reproduce the key experimental signatures of CISS: high polarisation, a threshold emergence at four total sites followed by interference-modulated growth with chain length, thermal suppression, and sign reversal upon chirality inversion. The central new result of this work is a clean separation of the CISS effect into an even (achiral) and an odd (chiral) contribution to the spin current, $I_{S_z}(ϕ) = I_{S_z}^{\\rm even}(ϕ) + I_{S_z}^{\\rm odd}(ϕ)$. We demonstrate that $I_{S_z}^{\\rm odd}$ vanishes exactly at fixed $m_z$ for chains of fewer than four sites and becomes non-zero for chains of four or more sites, with the smallest junction exhibiting a non-zero odd part being the four-site geometry (one gold atom plus three molecular sites). The odd part arises from reciprocity breaking in a device that is simultaneously chiral, magnetically asymmetric (moment on the gold end only), and long enough to support two or more Rashba-active bonds. This provides a direct, parameter-free test of whether an observed spin signal is genuinely chiral or arises from an achiral spin-valve mechanism.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.28406",
  "author_total": 1,
  "authors": [
    {
      "name": "Seif Alwan"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/8d5s5gtf3x8qc.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.28406",
  "fulltext_url": null,
  "id": "8d5s5gtf3x8qc",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.28406",
  "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 and electron transport phenomena"
    ]
  ],
  "openalex": "W7223157391",
  "pdf_url": "https://arxiv.org/pdf/2610.28406",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-20",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/8d5s5gtf3x8qc.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:34:04Z",
      "native_id": "2610.28406",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.28406"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mes-hall",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Quantum Formulation of the Spinterface Model",
  "title_text": "Quantum Formulation of the Spinterface Model",
  "type": "preprint",
  "updated_at": "2026-10-30T12:34:04Z",
  "url": "https://research.draconitic.com/paper/8d5s5gtf3x8qc",
  "venue": "arXiv",
  "versions": []
}