{
  "abstract": "Field-tuned crystal-field crossings provide a route to synthetic topology in localized rare-earth degrees of freedom when symmetry-resolved perturbations can independently control the crossing states. Here we show that a field-induced crossing in cubic Ce$^{3+}$ has precisely this structure. For $B\\parallel[001]$, the crossing is protected by a twofold rotation, while the $T_{2g}$ shears $ε_{xz}$ and $ε_{yz}$ break that protection and mix the two states through orthogonal pseudospin components. Together with magnetic-field detuning, these controls generate an isolated diabolical point with unit-magnitude Chern charge in a three-dimensional parameter space. Using the CeTe crystal-field scale gives an ideal single-ion crossing near $35.5$ T. A calibrated point-charge calculation gives a representative projected shear coupling $|α_{T_{2g}}|\\simeq18.1$ meV per unit tensor strain, corresponding to gaps of $0.036$ and $0.072$ meV for tensor shears of $0.10\\%$ and $0.20\\%$. We identify the associated elastic and magnetic signatures, discuss the limitations of the electrostatic estimate in a hybridizing Ce compound, and determine the adiabatic and coherence requirements for cyclic geometric control. The result is a symmetry-based framework that connects high-field crystal-field reconstruction, strain response, and parameter-space topology in rare-earth systems.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.30737",
  "author_total": 2,
  "authors": [
    {
      "name": "A. Ghosh"
    },
    {
      "name": "J. T. Haraldsen"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/5fvmf0d1rmez9.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.30737",
  "fulltext_url": null,
  "id": "5fvmf0d1rmez9",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.30737",
  "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.mtrl-sci"
    ],
    [
      "arxiv",
      "cond-mat.other"
    ],
    [
      "openalex",
      "3104|Rare-earth and actinide compounds"
    ]
  ],
  "openalex": "W7214667367",
  "pdf_url": "https://arxiv.org/pdf/2609.30737",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-25",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/5fvmf0d1rmez9.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:24:52Z",
      "native_id": "2609.30737",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.30737"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Strain-controlled topology and quantum control at a cubic Ce$^{3+}$ crystal-field crossing",
  "title_text": "Strain-controlled topology and quantum control at a cubic Ce^3+ crystal-field crossing",
  "type": "preprint",
  "updated_at": "2026-10-30T12:24:52Z",
  "url": "https://research.draconitic.com/paper/5fvmf0d1rmez9",
  "venue": "arXiv",
  "versions": []
}