{
  "id": "1905.07651",
  "version": "v1",
  "published": "2019-05-18T22:09:04.000Z",
  "updated": "2019-05-18T22:09:04.000Z",
  "title": "Electrically-tunable flat bands and magnetism in twisted bilayer graphene",
  "authors": [
    "T. M. R. Wolf",
    "J. L. Lado",
    "G. Blatter",
    "O. Zilberberg"
  ],
  "comment": "6 pages, 3 figures and supplementary material (4 pages, 3 figures). Comments are welcome",
  "categories": [
    "cond-mat.mes-hall",
    "cond-mat.mtrl-sci",
    "cond-mat.str-el"
  ],
  "abstract": "Twisted graphene bilayers provide a versatile platform to engineer metamaterials with novel emergent properties by exploiting the resulting geometric moir\\'{e} superlattice. Such superlattices are known to host bulk valley currents at tiny angles ($\\alpha\\approx 0.3 ^\\circ$) and flat bands at magic angles ($\\alpha \\approx 1^\\circ$). We show that tuning the twist angle to $\\alpha^*\\approx 0.8^\\circ$ generates flat bands with triangular superlattice periodicity. When doped with $\\pm 6$ electrons per moir\\'e cell, these bands are half-filled and electronic interactions produce a symmetry-broken ground state (Stoner instability) with spin-polarized regions that order ferromagnetically. Application of an interlayer electric field breaks inversion symmetry and introduces valley-dependent dispersion that quenches the magnetic order. With these results, we propose a solid-state platform that realizes electrically tunable strong correlations.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2019-05-18T22:09:04.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "twisted bilayer graphene",
      "electrically-tunable flat bands",
      "electrically tunable strong correlations",
      "interlayer electric field breaks inversion",
      "electric field breaks inversion symmetry"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 6,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}