{
  "id": "2405.20393",
  "version": "v1",
  "published": "2024-05-30T18:05:03.000Z",
  "updated": "2024-05-30T18:05:03.000Z",
  "title": "Coulomb drag in graphene/hBN/graphene moiré heterostructures",
  "authors": [
    "Yueyang Wang",
    "Hongxia Xue",
    "Kenji Watanabe",
    "Takashi Taniguchi",
    "Dong-Keun Ki"
  ],
  "comment": "6 pages, 4 figures",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "We report on the observation of Coulomb drag between graphene-hexagonal boron nitride (hBN) moir\\'e heterostructure with a moir\\'e wavelength of ~10 nm and an intrinsic graphene with a lattice constant of ~0.25 nm. By tuning carrier densities of each graphene layer independently, we find that the charge carriers in moir\\'e mini-bands, i.e., near the satellite Dirac point (sDP), can be coupled with the massless Fermions near the original Dirac point (oDP), strongly enough to generate a finite drag resistance. At high temperature ($T$) and large density ($n$), the drag resistances near both oDP and sDP follow a typical $n^{-1.5}$ and $T^2$ power law dependence as expected for the momentum transfer process and it also satisfies the layer reciprocity. In contrast, at low $T$, the layer reciprocity is broken in both regions that suggest dominant energy drag. Furthermore, quantitatively, the drag resistances near sDPs are smaller than those near oDP and they deviate from $T^2$ dependence below ~100 K. These results suggest that the coupling between the carriers in moir\\'e mini-bands and those in original Dirac bands may not be of a simple Fermi liquid nature.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2024-05-30T18:05:03.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "coulomb drag",
      "heterostructure",
      "simple fermi liquid nature",
      "layer reciprocity",
      "graphene/hbn/graphene"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 6,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}