{
  "id": "2302.01829",
  "version": "v1",
  "published": "2023-02-03T16:06:32.000Z",
  "updated": "2023-02-03T16:06:32.000Z",
  "title": "Signatures of two- and three-dimensional semimetals from circular dichroism",
  "authors": [
    "Ipsita Mandal",
    "Sajid Sekh"
  ],
  "comment": "8 pages, 3 figures; follow-up paper of arXiv:2105.05272",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "Topological invariants are crucial quantities for classifying materials with topological phases. Hence, their connections with experimentally measurable quantities are extremely important. In this context, circular dichroism (CD) provides a protocol to detect the Chern number $\\mathcal{C}_0$ of the lowest energy Bloch band (LBB) of a semimetal. This hinges on the unequal depletion rates of the Bloch electrons from a filled LBB, under the action of a time-periodic circular drive, depending on the chirality of the polarization. According to the dimensionality of the system (i.e., whether it is two- or three-dimensional), the integrated differential rate for depletion has to be formulated a bit differently in order to relate it to $\\mathcal{C}_0$. Our aim is to capture the nature of the CD response for semimetals with anisotropic band dispersions. We show that while the quantization of the CD response for the three-dimensional cases is strongly sensitive to anisotropy, the two-dimensional counterparts show a perfectly quantized response.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2023-02-03T16:06:32.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "circular dichroism",
      "three-dimensional semimetals",
      "signatures",
      "cd response",
      "lowest energy bloch band"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 8,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}