{
  "abstract": "Using state-of-the-art numerical techniques, we investigate how quantum phase fluctuations and quasiparticle tunneling shape the behavior of a small-capacitance Josephson junction across Ohmic, sub-Ohmic, and super-Ohmic dissipation regimes. We show that increasing the Ohmic dissipation strength drives a Berezinskii-Kosterlitz-Thouless quantum phase transition at thermodynamic equilibrium. Deviations from Ohmic behavior profoundly alter this scenario: the super-Ohmic regime exhibits no phase transition, whereas the sub-Ohmic regime displays a continuous second-order transition, consistent with the universality classes of the spin-boson model. Within the Ohmic regime, real-frequency linear-response calculations reveal that the phase particle does not undergo the commonly assumed diffusive-to-localized crossover. Instead, finite resistance progressively suppresses the singular zero-frequency response, producing a ballistic-to-localized change in the dynamics. At finite frequencies, coupling to the environment generates a long-lived excitation in the charge response, which evolves into a resonance as the subgap and shunt resistances are reduced.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2608.29830",
  "author_total": 8,
  "authors": [
    {
      "name": "F. G. Capone"
    },
    {
      "name": "A. de Candia"
    },
    {
      "name": "G. Di Bello"
    },
    {
      "name": "V. Cataudella"
    },
    {
      "name": "R. Fazio"
    },
    {
      "name": "N. Nagaosa"
    },
    {
      "name": "C. A. Perroni"
    },
    {
      "name": "G. De Filippis"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/fb0p1fdedmsa5.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2608.29830",
  "fulltext_url": null,
  "id": "fb0p1fdedmsa5",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2608.29830",
  "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",
      "cond-mat.mes-hall"
    ],
    [
      "arxiv",
      "cond-mat.stat-mech"
    ],
    [
      "arxiv",
      "cond-mat.supr-con"
    ],
    [
      "openalex",
      "3104|Physics of Superconductivity and Magnetism"
    ]
  ],
  "openalex": "W7204953574",
  "pdf_url": "https://arxiv.org/pdf/2608.29830",
  "pmcid": null,
  "pmid": null,
  "published": "2026-08-30",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/fb0p1fdedmsa5.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:41Z",
      "native_id": "2608.29830",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2608.29830"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mes-hall",
      "subfield": "condensed-matter"
    },
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.stat-mech",
      "subfield": "statistical-nonlinear"
    }
  ],
  "title": "Ballistic-to-Localized Dynamics as Signature of Quantum Phase Transition in Josephson Junction",
  "title_text": "Ballistic-to-Localized Dynamics as Signature of Quantum Phase Transition in Josephson Junction",
  "type": "preprint",
  "updated_at": "2026-10-30T12:17:41Z",
  "url": "https://research.draconitic.com/paper/fb0p1fdedmsa5",
  "venue": "arXiv",
  "versions": []
}