{
  "id": "1901.07943",
  "version": "v1",
  "published": "2019-01-23T15:20:27.000Z",
  "updated": "2019-01-23T15:20:27.000Z",
  "title": "Enhancement of thermoelectric performance of a nanoribbon made of alpha-$T_3$ lattice",
  "authors": [
    "SK Firoz Islam"
  ],
  "comment": "31 figures including all subfigures. Comments are welcome",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "We present electronic and transport properties of a zigzag nanoribbon made of alpha-$\\mathcal{T}_3$ lattice. Our particular focus is on the interplay of edge modes, arise from the zigzag edge geometry, and variable Berry phase on the thermoelectric transport properties. Unlike the case of graphene nanoribbon, the zigzag nanoribbon of $\\alpha-\\mathcal{T}_3$ lattice can host a pair of dispersive (chiral) edge modes at the two valleys for specific width of the ribbon. Moreover, gap opening can also occur at the two valleys depending on the width. The slope of the chiral edge modes and the energy gap strongly depend on the Berry phase. We compute corresponding transport coefficients such as conductance, thermopower, thermalconductivity and the thermoelectric figure of merits by using the tight-binding Green function formalism, in order to explore the roles of the the variable Berry phase and edge modes. It is found that the thermopower and thermoelectric figure of merits can be enhanced significantly by adjusting the Berry phase. This enhancement can be attributed to the peculiar nature of edge modes with the variation of Berry phase in such lattice. Finally, we reveal that the presence of line defect can cause a significant impact on the edge modes as well as on electrical conductance if the defect is very near to the edge.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2019-01-23T15:20:27.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "thermoelectric performance",
      "enhancement",
      "variable berry phase",
      "zigzag nanoribbon",
      "thermoelectric figure"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}