{
  "id": "1508.04825",
  "version": "v1",
  "published": "2015-08-19T22:54:53.000Z",
  "updated": "2015-08-19T22:54:53.000Z",
  "title": "Tunable chirality and circular dichroism of a topological insulator with $ C_{2v} $ symmetry as a function of Rashba and Dresselhaus parameters",
  "authors": [
    "Parijat Sengupta",
    "Enrico Bellotti"
  ],
  "comment": "5 pages, 6 figures",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "Polarization-sensitive devices rely on meta-materials to exhibit varying degrees of absorption of light of a given handedness. The chiral surface states of a topological insulator(TI) selectively absorb right and left circularly polarized light in the vicinity of the Dirac cone reaching its maximum of unity at the $ \\Gamma $ point. In this letter, we demonstrate that a band gap open TI with C$_{2v}$ symmetry which is represented through a combination of Rashba and Dresselhaus Hamiltonians alters the preferential absorption of left and right circularly polarized light allowing a smooth variation of the circular dichroism(CD). This variation in CD, reflected in a range of positive and negative values is shown to be a function of the Rashba and Dresselhaus coupling parameters. Additionally, we draw a parallel between the varying CD and the emerging field of valley-electronics in transition metal dichalcogenides and note the possibility of the chiral states as a basis toward quantum information processing.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2015-08-19T22:54:53.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "circular dichroism",
      "topological insulator",
      "dresselhaus parameters",
      "tunable chirality",
      "circularly polarized light"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 5,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}