{
  "id": "0906.2654",
  "version": "v2",
  "published": "2009-06-15T10:26:05.000Z",
  "updated": "2009-10-13T12:59:29.000Z",
  "title": "Persistent currents in nanorings and quantum decoherence by Coulomb interaction",
  "authors": [
    "Andrew G. Semenov",
    "Andrei D. Zaikin"
  ],
  "comment": "13 pages, 4 figures",
  "journal": "Phys. Rev. B 80, 155312 (2009)",
  "doi": "10.1103/PhysRevB.80.155312",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "Employing instanton technique we evaluate equilibrium persistent current (PC) produced by a quantum particle moving in a periodic potential on a ring and interacting with a dissipative environment formed by diffusive electron gas. The model allows for detailed non-perturbative analysis of interaction effects and -- depending on the system parameters -- yields a rich structure of different regimes. We demonstrate that at low temperatures PC is exponentially suppressed at sufficiently large ring perimeters $2\\pi R> L_{\\varphi}$ where the dephasing length $L_{\\varphi}$ is set by interactions and does not depend on temperature. This behavior represents a clear example of quantum decoherence by electron-electron interactions at $T\\to 0$.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2009-10-13T12:59:29.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "73.23.Hk",
      "73.40.Gk"
    ],
    "keywords": [
      "quantum decoherence",
      "coulomb interaction",
      "evaluate equilibrium persistent current",
      "low temperatures pc",
      "electron-electron interactions"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review B",
      "year": 2009,
      "month": "Oct",
      "volume": 80,
      "number": 15,
      "pages": 155312
    },
    "note": {
      "typesetting": "TeX",
      "pages": 13,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2009PhRvB..80o5312S"
    }
  }
}