{
  "abstract": "4H-SiC low gain avalanche detectors (LGADs) combine internal gain with the high carrier saturation drift velocity, thermal stability, and low leakage current of SiC. AC-coupled readout (AC-LGAD) adds position information to the precise timing, which enables 4D tracking. This work reports the first experimental demonstration of a 4H-SiC AC-LGAD. Devices with a $1.0\\times1.0$~mm$^2$ active area and a $2\\times2$ array of AC-coupled pads at a pitch of 500~$μ$m were fabricated with two gain-layer doping concentrations, $4\\times10^{17}$ and $5\\times10^{17}$~cm$^{-3}$, and characterized with a 375~nm ultraviolet transient current technique (UV-TCT) scanning setup. The hit position and time were reconstructed with the conventional discretized positioning circuit (DPC) and constant fraction discrimination (CFD) methods. They were also reconstructed with a transformer-based neural network, which processes the full waveforms of the four pads through a shared encoder and formulates timing as a per-sample segmentation task. With DPC and CFD, the best position and time resolutions are about 10~$μ$m and 20~ps. The neural network mitigates the nonlinear distortions near the device edges and improves the position resolution to below 5~$μ$m and the time resolution to about 15~ps, improvements of more than 60\\% and 30\\%, respectively. The higher-doped device reaches a high signal-to-noise ratio at lower bias and keeps good performance at low laser intensities. These results demonstrate the potential of 4H-SiC AC-LGADs for 4D tracking in future collider experiments.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.27535",
  "author_total": 15,
  "authors": [
    {
      "name": "Tao Yang"
    },
    {
      "name": "Chengxi Yang"
    },
    {
      "name": "Ben J. Sekely"
    },
    {
      "name": "Yashas Satapathy"
    },
    {
      "name": "Abraham Tishelman-Charny"
    },
    {
      "name": "Greg Allion"
    },
    {
      "name": "Gil Atar"
    },
    {
      "name": "Philip Barletta"
    },
    {
      "name": "Gabriele Giacomini"
    },
    {
      "name": "Carl Haber"
    },
    {
      "name": "Steve Holland"
    },
    {
      "name": "John F. Muth"
    },
    {
      "name": "Spyridon Pavlidis"
    },
    {
      "name": "Haichen Wang"
    },
    {
      "name": "Stefania Stucci"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/av6tgt42c74jj.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.27535",
  "fulltext_url": null,
  "id": "av6tgt42c74jj",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.27535",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "physics.ins-det"
    ],
    [
      "openalex",
      "3106|Particle Detector Development and Performance"
    ]
  ],
  "openalex": "W7223106507",
  "pdf_url": "https://arxiv.org/pdf/2610.27535",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-20",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/av6tgt42c74jj.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:34:04Z",
      "native_id": "2610.27535",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.27535"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.ins-det",
      "subfield": "applied-instrumentation"
    }
  ],
  "title": "Ultra-Fast 4H-SiC AC-LGAD for 4D Tracking Applications",
  "title_text": "Ultra-Fast 4H-SiC AC-LGAD for 4D Tracking Applications",
  "type": "preprint",
  "updated_at": "2026-10-30T12:34:04Z",
  "url": "https://research.draconitic.com/paper/av6tgt42c74jj",
  "venue": "arXiv",
  "versions": []
}