{
  "id": "1609.07790",
  "version": "v1",
  "published": "2016-09-25T19:50:46.000Z",
  "updated": "2016-09-25T19:50:46.000Z",
  "title": "Theory of interaction-induced renormalization of Drude weight and plasmon frequency in chiral multilayer graphene",
  "authors": [
    "Xiao Li",
    "Wang-Kong Tse"
  ],
  "comment": "18 pages, 4 figures",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "We develop a theory for the optical conductivity of doped multilayer graphene including the effects of electron-electron interactions. Applying the quantum kinetic formalism, we formulate a set of pseudospin Bloch equations that governs the dynamics of the nonequilibrium density matrix driven by an external \\emph{a.c.} electric field under the influence of Coulomb interactions. These equations reveal a dynamical mechanism that couples the Drude and interband responses arising from the chirality of pseudospin textures in multilayer graphene systems. We demonstrate that this results in an interaction-induced enhancement of the Drude weight and plasmon frequency strongly dependent on the pseudospin winding number. Using bilayer graphene as an example, we also study the influence of higher-energy bands and find that they contribute considerable renormalization effects not captured by a low-energy two-band description. We argue that this enhancement of Drude weight and plasmon frequency occurs generally in materials characterized by electronic chirality.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2016-09-25T19:50:46.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "drude weight",
      "chiral multilayer graphene",
      "interaction-induced renormalization",
      "nonequilibrium density matrix driven",
      "quantum kinetic formalism"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 18,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}