{
  "id": "1008.1262",
  "version": "v1",
  "published": "2010-08-06T19:48:48.000Z",
  "updated": "2010-08-06T19:48:48.000Z",
  "title": "Quantum Phase Transition and Dynamically Enhanced Symmetry in Quadruple Quantum Dot System",
  "authors": [
    "Dong E. Liu",
    "Shailesh Chandrasekharan",
    "Harold U. Baranger"
  ],
  "comment": "4 pages main text + 4 pages supplementary material",
  "journal": "Phys. Rev. Lett. 105, 256801 (2010)",
  "doi": "10.1103/PhysRevLett.105.256801",
  "categories": [
    "cond-mat.mes-hall",
    "cond-mat.str-el"
  ],
  "abstract": "We propose a system of four quantum dots designed to study the competition between three types of interactions: Heisenberg, Kondo and Ising. We find a rich phase diagram containing two sharp features: a quantum phase transition (QPT) between charge-ordered and charge-liquid phases, and a dramatic resonance in the charge liquid visible in the conductance. The QPT is of the Kosterlitz-Thouless type with a discontinuous jump in the conductance at the transition. We connect the resonance phenomenon with the degeneracy of three levels in the isolated quadruple dot and argue that this leads to a Kondo-like dynamical enhancement of symmetry from U(1) x Z_2 to U(1) x U(1).",
  "revisions": [
    {
      "version": "v1",
      "updated": "2010-08-06T19:48:48.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "73.21.La",
      "05.30.Rt",
      "72.10.Fk",
      "73.23.Hk"
    ],
    "keywords": [
      "quadruple quantum dot system",
      "quantum phase transition",
      "dynamically enhanced symmetry",
      "rich phase diagram containing"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review Letters",
      "year": 2010,
      "month": "Dec",
      "volume": 105,
      "number": 25,
      "pages": 256801
    },
    "note": {
      "typesetting": "TeX",
      "pages": 4,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2010PhRvL.105y6801L"
    }
  }
}