{
  "abstract": "Constant-frequency oscillation is usually tied to the broken phase of a spatially coupled PT-symmetric dimer, where the eigenfrequencies form a complex-conjugate pair with a fixed real part. This work shows that an analogous locking can instead come from Floquet hybridization in a synthetic frequency dimension. Periodic gain--loss modulation folds the spectrum into replicas spaced by the drive frequency $Ω$. Coupling between neighboring replicas opens an additional real-part degeneracy at the edge of the Floquet Brillouin zone. The hybridized Floquet mode at $ω_0\\pmΩ/2$ requires the minimum gain and is therefore selected for the self-oscillation. A Floquet PT-symmetric circuit with a JFET time-varying negative resistance confirms the prediction. The observed constant-frequency oscillation contains two frequency components of comparable amplitude, separated by the modulation frequency, which identifies its origin from Floquet hybridization rather than ordinary PT-symmetry breaking or dispersion flattening. More broadly, once a suitably symmetry-constrained spectral degeneracy is established, self-sustained frequency pinning can arise beyond the conventional spatial PT-broken phase.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.03560",
  "author_total": 6,
  "authors": [
    {
      "name": "Xiaoke Gao"
    },
    {
      "name": "Xiaoyin Sha"
    },
    {
      "name": "Xunyan Sun"
    },
    {
      "name": "Xianglin Hao"
    },
    {
      "name": "Huaiqing Zhang"
    },
    {
      "name": "Tianyu Dong"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/2eaknbd6jfjzk.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.03560",
  "fulltext_url": null,
  "id": "2eaknbd6jfjzk",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.03560",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "physics.app-ph"
    ],
    [
      "arxiv",
      "physics.optics"
    ],
    [
      "openalex",
      "3107|Quantum Mechanics and Non-Hermitian Physics"
    ]
  ],
  "openalex": "W7220396401",
  "pdf_url": "https://arxiv.org/pdf/2610.03560",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-02",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/2eaknbd6jfjzk.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:26:45Z",
      "native_id": "2610.03560",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.03560"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.app-ph",
      "subfield": "applied-instrumentation"
    },
    {
      "field": "physics",
      "origin": "arxiv:physics.optics",
      "subfield": "optics-photonics"
    }
  ],
  "title": "Beyond the PT-Broken Phase: Constant-Frequency Oscillation from Floquet Hybridization",
  "title_text": "Beyond the PT-Broken Phase: Constant-Frequency Oscillation from Floquet Hybridization",
  "type": "preprint",
  "updated_at": "2026-10-30T12:26:45Z",
  "url": "https://research.draconitic.com/paper/2eaknbd6jfjzk",
  "venue": "arXiv",
  "versions": []
}