{
  "id": "2202.09018",
  "version": "v1",
  "published": "2022-02-18T04:27:15.000Z",
  "updated": "2022-02-18T04:27:15.000Z",
  "title": "Strong suppression of near-field thermal transport between twisted bilayer graphene near the magic angle",
  "authors": [
    "Fuwei Yang",
    "Bai Song"
  ],
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "Twisted bilayer graphene (TBLG) has recently emerged as a versatile platform for studying a variety of exotic transport phenomena. Here, we present a theoretical study of near-field thermal radiation between suspended TBLG with a focus on the magic angle. Within the chirally symmetric continuum model, we observe a suppressed heat flow when approaching the magic angle owing to a reduced Drude weight, with greater suppressions at lower temperatures and larger gap sizes. When the chemical potential lies in the energy gap near the charge neutrality point, more than 100-fold heat-flow variation can be achieved at 50 K within 0.25{\\deg}of twist. By reducing the electron scattering rate, the radiation spectrum near the magic angle dramatically narrows, leading to over 10,000-fold of suppression. In addition, supported TBLG is briefly considered to facilitate experimental measurement. With rationally tailored substrates, the heat-flow contrast can still exceed 1000. We also discuss lattice relaxation effect in terms of the interlayer coupling energy, finding that a stronger coupling leads to a smaller heat-flow contrast and more prominent multiband transport. Our results highlight the great potential of magic-angle TBLG in thermal transport, especially for controlling thermal radiation.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2022-02-18T04:27:15.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "twisted bilayer graphene",
      "magic angle",
      "near-field thermal transport",
      "strong suppression",
      "near-field thermal radiation"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}