{
  "id": "0909.2981",
  "version": "v1",
  "published": "2009-09-16T11:07:06.000Z",
  "updated": "2009-09-16T11:07:06.000Z",
  "title": "Fractional topological excitations and quantum phase transition in a bilayer 2DEG adjacent to a superconductor film",
  "authors": [
    "Ningning Hao",
    "Wei Zhang",
    "Zhigang Wang",
    "Yupeng Wang",
    "Ping Zhang"
  ],
  "comment": "5 pages, 4 figures",
  "categories": [
    "cond-mat.mes-hall",
    "cond-mat.str-el"
  ],
  "abstract": "We study a bilayer two-dimension-electron-gas (2DEG) adjacent to a type-II superconductor thin film with a pinned vortex lattice. We find that with increasing interlayer tunneling, the system of half filling presents three phases: gapped phase-I (topological insulator), gapless critical phase-II (metal), and gapped phase-III (band insulator). The Hall conductance for phase-I/III is 2/0 $e^{2}/h$, and has non-quantized values in phase-II. The excitation (response to topological defect, a local vortex defect) in these three phases shows different behaviors due to the topological property of the system, including fractional charge $e/2$ for each layer in phase-I. While in the case of quarter filling, the system undergoes a quantum phase transition from metallic phase to topological insulator phase (with excitation of fractional charge $e/4$).",
  "revisions": [
    {
      "version": "v1",
      "updated": "2009-09-16T11:07:06.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "73.43.-f",
      "71.10.Pm",
      "74.25.Uv"
    ],
    "keywords": [
      "quantum phase transition",
      "bilayer 2deg adjacent",
      "fractional topological excitations",
      "superconductor film",
      "type-ii superconductor thin film"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1103/PhysRevB.81.125301",
      "journal": "Physical Review B",
      "year": 2010,
      "month": "Mar",
      "volume": 81,
      "number": 12,
      "pages": 125301
    },
    "note": {
      "typesetting": "TeX",
      "pages": 5,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2010PhRvB..81l5301H"
    }
  }
}