{
  "id": "2404.05914",
  "version": "v1",
  "published": "2024-04-09T00:26:05.000Z",
  "updated": "2024-04-09T00:26:05.000Z",
  "title": "Seebeck Effect of Dirac Electrons in Organic Conductors under Hydrostatic Pressure Using a Tight-Binding Model Derived from First Principles",
  "authors": [
    "Yoshikazu Suzumura",
    "Takao Tsumuraya",
    "Masao Ogata"
  ],
  "comment": "7 pages,12 figures",
  "journal": "J. Phys. Soc. Jpn. 93, 054704 (2024)",
  "doi": "10.7566/JPSJ.93.054704",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "The Seebeck coefficient is examined for two-dimensional Dirac electrons in the three-quarter filled organic conductor alpha-(BEDT-TTF)_2I_3 under hydrostatic pressure, where the Seebeck coefficient is proportional to the ratio of the thermoelectric conductivity to the electrical conductivity. We present an improved tight-binding model in two dimensions with transfer energies determined from first-principles density functional theory calculations with an experimentally determined crystal structure. The temperatutre dependence of the Seebeck coefficient is calculated by adding impurity and electron-phonon scatterings. Noting a zero-gap state due to the Dirac cone, which results in a competition from contributions between the conduction and valence bands, we show positive S_x and S_y at finite temperatures and analyze them in terms of spectral conductivity. The relevance of the calculated S_x (perpendicular to the molecular stacking axis) to the experiment is discussed.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2024-04-09T00:26:05.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "hydrostatic pressure",
      "organic conductor",
      "dirac electrons",
      "tight-binding model",
      "first principles"
    ],
    "tags": [
      "journal article"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 7,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}