{
  "id": "1401.0902",
  "version": "v1",
  "published": "2014-01-05T15:19:05.000Z",
  "updated": "2014-01-05T15:19:05.000Z",
  "title": "Electron-hole pairing in graphene-GaAs heterostructures",
  "authors": [
    "A. Gamucci",
    "D. Spirito",
    "M. Carrega",
    "B. Karmakar",
    "A. Lombardo",
    "M. Bruna",
    "A. C. Ferrari",
    "L. N. Pfeiffer",
    "K. W. West",
    "Marco Polini",
    "V. Pellegrini"
  ],
  "comment": "9 pages, 9 figures, 72 references",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "Vertical heterostructures combining different layered materials offer novel opportunities for applications and fundamental studies of collective behavior driven by inter-layer Coulomb coupling. Here we report heterostructures comprising a single-layer (or bilayer) graphene carrying a fluid of massless (massive) chiral carriers, and a quantum well created in GaAs 31.5 nm below the surface, supporting a high-mobility two-dimensional electron gas. These are a new class of double-layer devices composed of spatially-separated electron and hole fluids. We find that the Coulomb drag resistivity significantly increases for temperatures below 5-10 K, following a logarithmic law. This anomalous behavior is a signature of the onset of strong inter-layer correlations, compatible with the formation of a condensate of permanent excitons. The ability to induce strongly-correlated electron-hole states paves the way for the realization of coherent circuits with minimal dissipation and nanodevices including analog-to-digital converters and topologically protected quantum bits.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2014-01-05T15:19:05.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "graphene-gaas heterostructures",
      "electron-hole pairing",
      "coulomb drag resistivity significantly increases",
      "layered materials offer novel opportunities",
      "induce strongly-correlated electron-hole states paves"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1038/ncomms6824",
      "journal": "Nature Communications",
      "year": 2014,
      "month": "Dec",
      "volume": 5,
      "pages": 5824
    },
    "note": {
      "typesetting": "TeX",
      "pages": 9,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1276347,
      "adsabs": "2014arXiv1401.0902G"
    }
  }
}