{
  "id": "1809.08407",
  "version": "v1",
  "published": "2018-09-22T08:38:27.000Z",
  "updated": "2018-09-22T08:38:27.000Z",
  "title": "Electron-phonon interaction in magic-angle twisted bilayer graphene",
  "authors": [
    "Young Woo Choi",
    "Hyoung Joon Choi"
  ],
  "comment": "6 pages, 3 figures",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "We study the electron-phonon interaction in magic-angle twisted bilayer graphene (MA-TBG) at the atomistic level, considering the effects of lattice relaxations on the electronic structure. The electron-phonon matrix elements are calculated from the modulation of hopping energy due to atomic displacements of phonon modes. While our method confirms small values of the electron-phonon coupling strength lambda ~ 0.1 in monolayer and unrotated bilayer graphene, our calculated values of lambda for MA-TBG reach over 1 near the half-filling energies of the flat bands. The enhancement is due to the large electron density of states of the flat bands. The lattice relaxation brings significant electron-hole asymmetry in the electronic density of states, thus the hole-side flat bands have much stronger coupling strength than the electron-side. The electron-phonon coupling is nearly isotropic, very weakly dependent on electron momentum. Our results highlight that the electron-phonon coupling in MA-TBG is strong enough to contribute to rich physics of the system.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2018-09-22T08:38:27.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "magic-angle twisted bilayer graphene",
      "electron-phonon interaction",
      "flat bands",
      "relaxation brings significant electron-hole asymmetry",
      "lattice relaxation brings significant electron-hole"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 6,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}