{
  "abstract": "We present a physics-based multiscale full-band Monte Carlo framework for modeling avalanche multiplication and excess noise in complex alloy avalanche photodiodes (APDs), demonstrated on Al$_{0.7}$InAsSb as a representative quaternary system. The framework links atomistic material structure to device-level avalanche statistics: an environment-dependent $sp^3d^5s^\\ast$ tight-binding calculation resolves the full conduction- and valence-band structure of the random- or digital-alloy configuration -- including $Γ$, X, and L valley ordering, non-parabolicity, anisotropy, and spin-orbit-induced valence-band splitting -- and supplies the band-structure inputs for stochastic high-field transport. A central element of the framework is a physics-derived treatment of alloy-disorder scattering, in which the quaternary disorder potential is constructed from atomic valence differences, covalent radii, and Thomas--Fermi screening through a composition-weighted decomposition into binary contributions, complemented by composition-interpolated polar-optical, acoustic, intervalley-phonon, impurity, and impact-ionization models. Because every material-dependent input is generated from the atomic composition and configuration by the same well-defined procedure, the framework transfers without structural modification to arbitrary zinc-blende ternary and quaternary alloys. Applied to a \\SI{1}{\\micro\\meter} Al$_{0.7}$InAsSb p-i-n APD, the framework reproduces the measured gain and excess-noise characteristics with only the impact-ionization softness parameters calibrated. The approach provides a documented, reproducible route for analyzing and designing complex alloy APDs in which band structure, disorder, and scattering physics jointly determine gain and ionization statistics.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.39795",
  "author_total": 4,
  "authors": [
    {
      "name": "Shafat Shahnewaz"
    },
    {
      "name": "Hannaneh Karimi"
    },
    {
      "name": "Joe C. Campbell"
    },
    {
      "name": "Avik W. Ghosh"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/8e422qkyb6d1f.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.39795",
  "fulltext_url": null,
  "id": "8e422qkyb6d1f",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.39795",
  "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.mtrl-sci"
    ],
    [
      "arxiv",
      "physics.app-ph"
    ],
    [
      "openalex",
      "2208|Advanced Semiconductor Detectors and Materials"
    ]
  ],
  "openalex": "W7215112661",
  "pdf_url": "https://arxiv.org/pdf/2609.39795",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-30",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/8e422qkyb6d1f.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:25:49Z",
      "native_id": "2609.39795",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.39795"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.app-ph",
      "subfield": "applied-instrumentation"
    },
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    }
  ],
  "title": "A transferable full-band Monte Carlo framework for complex alloy avalanche photodiodes",
  "title_text": "A transferable full-band Monte Carlo framework for complex alloy avalanche photodiodes",
  "type": "preprint",
  "updated_at": "2026-10-30T12:25:49Z",
  "url": "https://research.draconitic.com/paper/8e422qkyb6d1f",
  "venue": "arXiv",
  "versions": []
}