{
  "id": "2209.15155",
  "version": "v1",
  "published": "2022-09-30T00:50:28.000Z",
  "updated": "2022-09-30T00:50:28.000Z",
  "title": "Negative refraction in hyperbolic hetero-bicrystals",
  "authors": [
    "A. J. Sternbach",
    "S. Moore",
    "A. Rikhter",
    "S. Zhang",
    "R. Jing",
    "Y. Shao",
    "B. Kim",
    "S. Xu",
    "A. Rubio",
    "C. Dean",
    "J. Hone",
    "M. M. Fogler",
    "D. N. Basov"
  ],
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "We visualized negative refraction of phonon-polaritons in hetero-bicrystals of two hyperbolic van der Waals materials: molybdenum oxide ($MoO_3$) and isotopically pure hexagonal boron nitride ($h^{11}BN$). The polaritons - hybrids of infrared photons and lattice vibrations - form collimated rays that display negative refraction when passing through a planar interface between the $h^{11}BN$ and $MoO_3$ crystals. At a special frequency $\\omega_0$, these rays can circulate along closed diamond-shaped trajectories. We show that polariton eigenmodes display regions of both positive and negative dispersion interrupted by multiple gaps resulting from polaritonic level repulsion.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2022-09-30T00:50:28.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "negative refraction",
      "hyperbolic hetero-bicrystals",
      "hyperbolic van der waals materials",
      "isotopically pure hexagonal boron nitride",
      "polariton eigenmodes display regions"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}