{
  "abstract": "The superconducting diode effect is often associated with finite-momentum pairing, although model studies indicate that rectification reflects the asymmetry of the free energy about its minimum rather than the equilibrium pair momentum itself. Using a Wannier-based, self-consistent finite-$\\mathbf Q$ Bogoliubov-de Gennes approach with a Fermi-surface-adaptive quadrature that converges the critical currents, we show that the layer parity and orientation of magnetic proximity select the diode response of monolayer NbSe$_2$. For in-plane exchange, the equilibrium pair momentum $\\mathbf Q_{\\rm eq}$ and the diode efficiency are both linear in the layer-odd exchange contrast: parallel proximity on the two Se sublayers is reciprocal, and antiparallel proximity doubles the response. An out-of-plane component separates the two observables. It leaves $\\mathbf Q_{\\rm eq}$ nearly unchanged but, through pair breaking, suppresses the efficiency by more than an order of magnitude and, at low temperature, reverses it. Purely out-of-plane exchange, for which $C_3$ symmetry forbids a helical term, keeps $\\mathbf Q_{\\rm eq}=0$ yet produces a trigonal diode effect, controlled by the layer-even exchange and larger than the in-plane one above $0.65$~meV at low temperature. Magnetic layer parity thus selects between a helical and a trigonal diode channel. The trigonal channel is an intrinsic, symmetry-allowed contribution to the field-free rectification reported in NbSe$_2$/CrBr$_3$ and predicts that two-sided out-of-plane proximity cancels it when antiparallel and, at the same exchange per layer, enhances it about fourfold when parallel, in the computed range.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.38449",
  "author_total": 2,
  "authors": [
    {
      "name": "Yusuf Wicaksono"
    },
    {
      "name": "Toshikaze Kariyado"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/f1n6y8qa6xbqe.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.38449",
  "fulltext_url": null,
  "id": "f1n6y8qa6xbqe",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.38449",
  "language": null,
  "licence": "CC-BY-NC-SA-4.0",
  "licence_label": "CC BY-NC-SA 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by-nc-sa/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "cond-mat.mes-hall"
    ],
    [
      "arxiv",
      "cond-mat.supr-con"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2610.38449",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-28",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/f1n6y8qa6xbqe.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:36:23Z",
      "native_id": "2610.38449",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.38449"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mes-hall",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Layer-Parity Control of the Superconducting Diode Effect in Monolayer NbSe$_2$",
  "title_text": "Layer-Parity Control of the Superconducting Diode Effect in Monolayer NbSe_2",
  "type": "preprint",
  "updated_at": "2026-11-09T00:20:38Z",
  "url": "https://research.draconitic.com/paper/f1n6y8qa6xbqe",
  "venue": "arXiv",
  "versions": []
}