{
  "abstract": "Motivated by the recent discovery of unconventional surface superconductivity in PtBi$_{2}$, we theoretically study its signatures in the Little-Parks oscillations of a narrow ring made from the same material. Using a Ginzburg-Landau model with three coupled pairing channels allowed by the trigonal crystal symmetry, we show that a fixed in-plane magnetic field can make the mean-field transition temperature asymmetric under reversal of the normal flux through the ring, while preserving periodicity in the superconducting flux quantum. The leading weak-field contribution to this asymmetry is cubic in the in-plane field strength. The flux-odd component respects the threefold crystal symmetry and changes sign when the in-plane field is rotated by $π/3$ at fixed magnitude. Within the homogeneous ring model, this asymmetry is absent for a single pairing channel and arises from the coupling between the three channels. Our calculations further show that increasing the in-plane magnetic field can enhance the superconducting nucleation temperature through mixing of pairing channels, illustrating magnetic control of multicomponent superconductivity in mesoscopic rings. Little-Parks interferometry with independent control of flux and field direction thus offers a mesoscopic probe of the pairing state, complementary to spectroscopic studies of the gap structure.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2611.01764",
  "author_total": 4,
  "authors": [
    {
      "name": "Yuriy Yerin"
    },
    {
      "name": "Stefan-Ludwig Drechsler"
    },
    {
      "name": "Carsten Timm"
    },
    {
      "name": "Jeroen van den Brink"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/5vxdyafj2xv4z.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2611.01764",
  "fulltext_url": null,
  "id": "5vxdyafj2xv4z",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2611.01764",
  "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"
    ],
    [
      "arxiv",
      "cond-mat.mtrl-sci"
    ],
    [
      "arxiv",
      "cond-mat.supr-con"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2611.01764",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-01",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/5vxdyafj2xv4z.ris",
  "sources": [
    {
      "first_seen": "2026-11-03T12:20:59Z",
      "native_id": "2611.01764",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2611.01764"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mes-hall",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Asymmetric Little--Parks Oscillations as a Probe of Coupled Pairing Channels in Surface-Superconducting \\texorpdfstring{PtBi$_2$}{PtBi2}",
  "title_text": "Asymmetric Little--Parks Oscillations as a Probe of Coupled Pairing Channels in Surface-Superconducting \\texorpdfstring{PtBi_2}{PtBi2}",
  "type": "preprint",
  "updated_at": "2026-11-05T15:20:18Z",
  "url": "https://research.draconitic.com/paper/5vxdyafj2xv4z",
  "venue": "arXiv",
  "versions": []
}