{
  "abstract": "Hexagonal germanium combines direct-gap optical activity with the low-nuclear-spin environment of a group-IV material, making it a candidate platform for spin qubits and spin-photon interfaces. Using a ten-band $\\mathbf{k}\\cdot\\mathbf{p}$ model, we study the response of confined hole states in hexagonal germanium nanowires to magnetic and electric fields. We show that, by symmetry, the top valence band of the bulk crystal has a vanishing $g$ factor in the plane perpendicular to the $c$ axis, in analogy with the in-plane $g$ factor of heavy holes in two-dimensional hole gases. In nanowires, confinement induces only small transverse $g$-tensor components, so the $g$ tensor remains strongly anisotropic. A transverse electric field strongly reduces the nanowire band gap, providing a gate-tunable optical signature and limiting the usable field range. The same field induces a Rashba spin-orbit interaction that is markedly stronger for fields perpendicular to the $c$ axis and depends nonlinearly on the field strength. In narrow wires at strong fields, the spin-orbit length reaches a few tens of nanometers, comparable to hole devices in cubic silicon. We identify the microscopic origin of the Rashba coupling as a second-order process mediated by a few intermediate subbands with distinct symmetry selection rules. Our results provide guidance for the design of electrically controlled hole-spin qubits in hexagonal germanium nanowires.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2611.07846",
  "author_total": 4,
  "authors": [
    {
      "name": "Anirban Das"
    },
    {
      "name": "Baksa Kolok"
    },
    {
      "name": "Dániel Varjas"
    },
    {
      "name": "András Pályi"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/03c0sw4cqh1d1.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2611.07846",
  "fulltext_url": null,
  "id": "03c0sw4cqh1d1",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2611.07846",
  "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"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2611.07846",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-05",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/03c0sw4cqh1d1.ris",
  "sources": [
    {
      "first_seen": "2026-11-06T18:21:30Z",
      "native_id": "2611.07846",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2611.07846"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mes-hall",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Anisotropic g-tensor and strong spin-orbit interaction of holes in hexagonal germanium nanowires",
  "title_text": "Anisotropic g-tensor and strong spin-orbit interaction of holes in hexagonal germanium nanowires",
  "type": "preprint",
  "updated_at": "2026-11-09T00:20:41Z",
  "url": "https://research.draconitic.com/paper/03c0sw4cqh1d1",
  "venue": "arXiv",
  "versions": []
}