{
  "abstract": "We investigate the prospect of topological spin pumping and transport in a dimerized spin-$\\frac{1}{2}$ anisotropic XY chain with tunable in-plane anisotropy. Through a Jordan-Wigner transformation, the system maps onto an extended Rice-Mele-type fermionic model whose momentum-space band structure exhibits gapped regions characterized by nonzero Chern numbers ($\\pm 1$) as well as trivial and gapless regimes. Conventional momentum-space analysis therefore predicts quantized Thouless-type spin pumping in parts of the Chern number diagram. However, real-space time evolution under open boundary conditions reveals that the spin transport is generally not quantized away from the isotropic limit. In the anisotropic regime, eigen-energy states within the transporting subspace hybridize during the driving cycle, leading to a transport that depends on details of the driving protocol. Quantized pumping and transport survive only in the isotropic limit, where the Hamiltonian reduces to decoupled Rice-Mele sectors and the transported spin component is conserved. Our results demonstrate that momentum-space topological invariants alone do not guarantee quantized spin transport in anisotropic spin chains. More broadly, they show that the conventional Thouless-pumping framework does not straightforwardly extend to situations where the transported quantity is not conserved, highlighting the importance of real-space diagnostics in topological transport phenomena.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2611.08385",
  "author_total": 1,
  "authors": [
    {
      "name": "Mainak Pal"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/4vmt74gn9bkr6.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2611.08385",
  "fulltext_url": null,
  "id": "4vmt74gn9bkr6",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2611.08385",
  "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.str-el"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2611.08385",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-05",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/4vmt74gn9bkr6.ris",
  "sources": [
    {
      "first_seen": "2026-11-06T18:21:30Z",
      "native_id": "2611.08385",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2611.08385"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mes-hall",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Anisotropy lifts topological protection of transport in pumped spin chains",
  "title_text": "Anisotropy lifts topological protection of transport in pumped spin chains",
  "type": "preprint",
  "updated_at": "2026-11-06T18:21:30Z",
  "url": "https://research.draconitic.com/paper/4vmt74gn9bkr6",
  "venue": "arXiv",
  "versions": []
}