{
  "id": "1911.11538",
  "version": "v1",
  "published": "2019-11-26T14:02:07.000Z",
  "updated": "2019-11-26T14:02:07.000Z",
  "title": "Optical conductivity of multifold fermions: the case of RhSi",
  "authors": [
    "L. Z. Maulana",
    "K. Manna",
    "E. Uykur",
    "C. Felser",
    "M. Dressel",
    "A. V. Pronin"
  ],
  "comment": "5+ pages, 5 figures",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "We measured the reflectivity of the multifold semimetal RhSi in a frequency range from 80 to 20000 cm$^{-1}$ (10 meV - 2.5 eV) at temperatures down to 10 K. The optical conductivity, calculated from the reflectivity, is dominated by the free-carrier (Drude) contribution below 1000 cm$^{-1}$ (120 meV) and by interband transitions at higher frequencies. The temperature-induced changes in the spectra are generally weak - only the Drude bands narrow upon cooling with an unscreened plasma frequency being constant with temperature at approximately 1.4 eV, in agreement with a weak temperature dependence of the free-carrier concentration determined by Hall measurements. The interband portion of conductivity exhibits two linear-in-frequency regions below 5000 cm$^{-1}$ ($\\sim$ 600 meV), a broad flat maximum at around 6000 cm$^{-1}$ (750 meV), and a further increase starting around 10000 cm$^{-1}$ ($\\sim$ 1.2 eV). We assign the linear behavior of the interband conductivity to transitions between the linear bands near the band crossing points. Our findings are in accord with the predictions for the low-energy conductivity behavior in multifold semimetals and with earlier computations based on band structure calculations for RhSi.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2019-11-26T14:02:07.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "optical conductivity",
      "multifold fermions",
      "multifold semimetal rhsi",
      "band structure calculations",
      "low-energy conductivity behavior"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}