{
  "abstract": "We consider Josephson junctions formed by two minimal Kitaev chains and investigate how the interplay between non-Hermiticity and superconducting phase difference enables the realization of stable topological states that do not exist in the Hermitian realm. In particular, we focus on non-Hermiticity produced by coupling the minimal Kitaev chain Josephson junction to normal reservoirs, which renders the system open and characterized by a complex Andreev spectrum. Interestingly, we find that this complex spectrum hosts second order exceptional points, where a pair of eigenvalues and their respective eigenvectors coalesce, and are fully controlled by the superconducting phase difference. Depending on the spatial unequal distribution of non-Hermiticity, these Andreev exceptional points can appear at zero or finite energies connecting stable energy lines protected by non-Hermitian topology. Moreover, tuning the system parameters, such as onsite energies, non-Hermiticity, or electron cotunneling, the Andreev exceptional points give rise to Andreev exceptional lines enclosing protected two-dimensional zero real energy areas. We also discuss potential detection schemes of Andreev exceptional points by using local and nonlocal conductance signatures. Our results demonstrate the utility of non-Hermiticity from normal reservoirs as a useful resource for engineering non-Hermitian topological phases in minimal Kitaev chain Josephson junctions.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "Journal reference: J. Appl. Phys. 140, 144302 (2026)",
  "arxiv": "2606.23956",
  "author_total": 2,
  "authors": [
    {
      "name": "Jorge Cayao"
    },
    {
      "name": "Masatoshi Sato"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/08kzptz80n2j2.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2606.23956",
  "fulltext_url": null,
  "id": "08kzptz80n2j2",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2606.23956",
  "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.supr-con"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2606.23956",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-12",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/08kzptz80n2j2.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:29:06Z",
      "native_id": "2606.23956",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2606.23956"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mes-hall",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Andreev exceptional points in Josephson junctions formed by minimal Kitaev chains",
  "title_text": "Andreev exceptional points in Josephson junctions formed by minimal Kitaev chains",
  "type": "preprint",
  "updated_at": "2026-10-30T12:29:06Z",
  "url": "https://research.draconitic.com/paper/08kzptz80n2j2",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1063/5.0350119",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}