{
  "id": "2001.04416",
  "version": "v1",
  "published": "2020-01-13T17:34:23.000Z",
  "updated": "2020-01-13T17:34:23.000Z",
  "title": "Tuning the magic angle of twisted bilayer graphene at the exit of a waveguide",
  "authors": [
    "Michael Vogl",
    "Martin Rodriguez-Vega",
    "Gregory A. Fiete"
  ],
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "In this paper, we introduce a new method that allows reducing the strength of the interlayer couplings in few-layer van der Waals heterostructures by irradiating them with longitudinal waves of light. As a specific application, we consider twisted bilayer graphene and show that we can tune the magic angles in a controlled manner. Maxwell's equations tell us that the electromagnetic fields associated with light in a vacuum do not possess longitudinal components. However, this can be circumvented using waveguides, where longitudinal components can be generated. Boundary conditions imposed by a metallic surface make it possible to generate transverse magnetic modes (TM). We propose to place twisted bilayer graphene at a specific location at the exit of a waveguide, such that it is subjected to purely longitudinal components of a TM wave. We derive an analytic model to predict the magic angle as a function of the drive and waveguide parameters. This approach could be employed in experiments to tune the Fermi velocity in experiments and explore the strongly correlated physics in-situ.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2020-01-13T17:34:23.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "magic angle",
      "few-layer van der waals heterostructures",
      "generate transverse magnetic modes",
      "place twisted bilayer graphene",
      "possess longitudinal components"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}