{
  "abstract": "Neganov-Trofimov-Luke (NTL) amplification enables eV-sub-keV detection thresholds for low-mass dark-matter and coherent elastic neutrino-nucleus scattering experiments. We evaluated two University of South Dakota (USD)-grown germanium crystals fabricated as SuperCDMS-style four-channel athermal-phonon detectors and operated near 10 mK. The crystals had electrically active impurity concentrations near $10^10~\\mathrm^-3$ and etch-pit densities of $300$-$7000~\\mathrm^-2$. Contact-free biasing produced no resolvable amplification. However, after depositing a 600 nm aluminum bias contact, Detector~2 exhibited clear voltage-dependent NTL gain. The reconstructed channel-B energy increased from approximately 3.9 keV at 0 V to 34.9 keV at 40 V, corresponding to an 8.9-fold enhancement. Statistical centroid uncertainties were below 0.3%, while low-bias fits yielded effective prompt- and NTL-phonon response coefficients of $(6.77\\pm0.82)%$ and $(4.77\\pm0.20)%$, respectively, excluding systematic uncertainties. These results demonstrate the feasibility of USD-grown germanium for SuperCDMS-style high-voltage phonon detectors and highlight the importance of both crystal quality and contact fabrication in achieving NTL amplification.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.29973",
  "author_total": 5,
  "authors": [
    {
      "name": "Dongming Mei"
    },
    {
      "name": "Gerardo Gonzalez"
    },
    {
      "name": "William Baker"
    },
    {
      "name": "Mark Platt"
    },
    {
      "name": "Nader Mirabolfathi"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/2jdj4ppn8nnt6.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.29973",
  "fulltext_url": null,
  "id": "2jdj4ppn8nnt6",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.29973",
  "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",
      "cond-mat.supr-con"
    ],
    [
      "arxiv",
      "hep-ex"
    ],
    [
      "arxiv",
      "nucl-ex"
    ],
    [
      "arxiv",
      "physics.ins-det"
    ],
    [
      "openalex",
      "3106|Particle Detector Development and Performance"
    ]
  ],
  "openalex": "W7223217787",
  "pdf_url": "https://arxiv.org/pdf/2610.29973",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-21",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/2jdj4ppn8nnt6.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:34:19Z",
      "native_id": "2610.29973",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.29973"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.ins-det",
      "subfield": "applied-instrumentation"
    },
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.supr-con",
      "subfield": "condensed-matter"
    },
    {
      "field": "physics",
      "origin": "arxiv:hep-ex",
      "subfield": "high-energy"
    },
    {
      "field": "physics",
      "origin": "arxiv:nucl-ex",
      "subfield": "nuclear"
    }
  ],
  "title": "NTL amplification in a SuperCDMS-style detector fabricated from a University of South Dakota-grown germanium crystal",
  "title_text": "NTL amplification in a SuperCDMS-style detector fabricated from a University of South Dakota-grown germanium crystal",
  "type": "preprint",
  "updated_at": "2026-10-30T12:34:19Z",
  "url": "https://research.draconitic.com/paper/2jdj4ppn8nnt6",
  "venue": "arXiv",
  "versions": []
}