{
  "abstract": "The generation of high-charge, highly polarized positron beams in the interaction of a linearly polarized laser pulse with a nanowire-array target is investigated. Here, laser-driven electrons emit high-energy photons through nonlinear Compton scattering (NCS), which subsequently produce electron--positron pairs through the nonlinear Breit--Wheeler (NBW) process. We model this interaction using two-dimensional spin-resolved quantum electrodynamics particle-in-cell (QED-PIC)} simulations. At positron birth, the sign of $S_z$ is statistically correlated with that of the local $B_z$. The spatiotemporal field structure arising from the laser--nanowire interaction strengthens the correlation between the birth spin sign and the direction of the subsequent transverse Lorentz impulse, thereby limiting cancellation between opposite-spin contributions at a given angle. The results show that the average polarization degree reaches $|\\bar S_z|\\approx0.46$, and the positron charge satisfying $|\\bar S_z|>0.3$ is approximately $308\\,\\mathrm{nC}$. Parameter scans reveal that the high-polarization positron charge is maximized at intermediate target densities and nanowire periods. Such a source could enable polarization-sensitive studies of strong-field QED and spin-dependent phenomena in high-energy and materials physics.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.09908",
  "author_total": 7,
  "authors": [
    {
      "name": "De-Sheng Zhang"
    },
    {
      "name": "Cui-Wen Zhang"
    },
    {
      "name": "Kun Xue"
    },
    {
      "name": "Feng Wan"
    },
    {
      "name": "Xue-Ren Hong"
    },
    {
      "name": "Jian-Xing Li"
    },
    {
      "name": "Bai-Song Xie"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/abkyxykfgyn08.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.09908",
  "fulltext_url": null,
  "id": "abkyxykfgyn08",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.09908",
  "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.plasm-ph"
    ],
    [
      "openalex",
      "3106|Laser-Plasma Interactions and Diagnostics"
    ]
  ],
  "openalex": "W7212159536",
  "pdf_url": "https://arxiv.org/pdf/2609.09908",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-09",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/abkyxykfgyn08.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:20:12Z",
      "native_id": "2609.09908",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.09908"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.plasm-ph",
      "subfield": "plasma"
    }
  ],
  "title": "High-charge, highly polarized positron beams generated from a laser-driven nanowire-array target",
  "title_text": "High-charge, highly polarized positron beams generated from a laser-driven nanowire-array target",
  "type": "preprint",
  "updated_at": "2026-10-30T12:20:12Z",
  "url": "https://research.draconitic.com/paper/abkyxykfgyn08",
  "venue": "arXiv",
  "versions": []
}