{
  "id": "1506.06281",
  "version": "v1",
  "published": "2015-06-20T18:52:59.000Z",
  "updated": "2015-06-20T18:52:59.000Z",
  "title": "Observation of negative refraction of Dirac fermions in graphene",
  "authors": [
    "Gil-Ho Lee",
    "Geon-Hyoung Park",
    "Hu-Jong Lee"
  ],
  "comment": "16 pages, 4 figures",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "Half a century ago, Veselago proposed left-handed materials with negative permittivity and permeability, in which waves propagate with phase and group velocities in opposite directions. Significant work has been undertaken to attain this left-handed response, such as establishing a negative refractive index in so-called metamaterials, which consist of periodic sub-wavelength structures. However, an electronic counterpart has not been demonstrated owing to difficulties in creating repeated structures smaller than the electronic Fermi wavelength (\\lambda_F) of the order ~ 10 nm. Here, without needing to engineer sub-wavelength structures, we demonstrate negative refractive behaviour of Dirac fermions in graphene, exploiting its unique relativistic band structure. Analysis of both electron focusing through a n-p-n flat lens and negative refraction across n-p junctions confirms left-handed behaviour in the electronic system. This new approach to electronic optics is of particular relevance to the on-going efforts to develop novel quantum devices with emerging layered materials.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2015-06-20T18:52:59.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "dirac fermions",
      "negative refraction",
      "n-p junctions confirms left-handed behaviour",
      "unique relativistic band structure",
      "observation"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 16,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}