{
  "id": "2104.07975",
  "version": "v1",
  "published": "2021-04-16T08:56:58.000Z",
  "updated": "2021-04-16T08:56:58.000Z",
  "title": "The role of flexural coupling in heat dissipation from a two-dimensional layered material to its hexagonal boron nitride substrate",
  "authors": [
    "Zhun-Yong Ong",
    "Gang Zhang",
    "Yong-Wei Zhang"
  ],
  "comment": "11 pages, 7 figures. To be published in 2D Materials",
  "categories": [
    "cond-mat.mes-hall",
    "cond-mat.mtrl-sci"
  ],
  "abstract": "Understanding the limits of phononic heat dissipation from a two-dimensional layered material (2DLM) to its hexagonal boron nitride (h-BN) substrate and how it varies with the structure of the 2DLM is important for the design and thermal management of h-BN-supported nanoelectronic devices. We formulate an elasticity-based theory to model the phonon-mediated heat dissipation between a 2DLM and its h-BN substrate. By treating the h-BN substrate as a semi-infinite stack of harmonically coupled thin plates, we obtain semi-analytical expressions for the thermal boundary conductance (TBC) and interfacial phonon transmission spectrum. We evaluate the temperature-dependent TBC of the $N$-layer 2DLM (graphene or MoS$_{2}$) on different common substrates (h-BN vs. a-SiO$_{2}$) at different values of $N$. The results suggest that h-BN is substantially more effective for heat dissipation from MoS$_{2}$ than a-SiO$_{2}$ especially at large $N$. To understand the limitations of the our stack model, we also compare its predictions in the $N=\\infty$ limit to those of the more exact Atomistic Green's Function model for the graphite-BN and molybdenite-BN interfaces. Our stack model provides clear insights into the key role of the flexural modes in the TBC and how the anisotropic elastic properties of h-BN affect heat dissipation.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2021-04-16T08:56:58.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "heat dissipation",
      "hexagonal boron nitride substrate",
      "two-dimensional layered material",
      "flexural coupling",
      "exact atomistic greens function model"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 11,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}