{
  "id": "2103.10087",
  "version": "v1",
  "published": "2021-03-18T08:45:26.000Z",
  "updated": "2021-03-18T08:45:26.000Z",
  "title": "Anharmonic phonon-phonon scattering at interface by non-equilibrium Green's function formalism",
  "authors": [
    "Yangyu Guo",
    "Zhongwei Zhang",
    "Marc Bescond",
    "Shiyun Xiong",
    "Masahiro Nomura",
    "Sebastian Volz"
  ],
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "The understanding and modeling of inelastic scattering of thermal phonons at a solid/solid interface remain an open question. We present a fully quantum theoretical scheme to quantify the effect of anharmonic phonon-phonon scattering at an interface via non-equilibrium Green's function (NEGF) formalism. Based on the real-space scattering rate matrix, a decomposition of the interfacial spectral energy exchange is made into contributions from local and non-local anharmonic interactions, of which the former is shown to be predominant for high-frequency phonons whereas both are important for low-frequency phonons. The anharmonic decay of interfacial phonon modes is revealed to play a crucial role in bridging the bulk modes across the interface. The overall quantitative contribution of anharmonicity to thermal boundary conductance is found to be moderate. The present work promotes a deeper understanding of heat transport at the interface and an intuitive interpretation of anharmonic phonon NEGF formalism.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2021-03-18T08:45:26.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "non-equilibrium greens function formalism",
      "anharmonic phonon-phonon scattering",
      "anharmonic phonon negf formalism",
      "interfacial spectral energy exchange",
      "thermal boundary conductance"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}