{
  "id": "cond-mat/9707086",
  "version": "v1",
  "published": "1997-07-09T13:22:20.000Z",
  "updated": "1997-07-09T13:22:20.000Z",
  "title": "Charge Fluctuations in Quantum Point Contacts and Chaotic Cavities in the Presence of Transport",
  "authors": [
    "M. H. Pedersen",
    "S. A. van Langen",
    "M. Buttiker"
  ],
  "comment": "9 pages, two-column Revtex, 6 figures included",
  "journal": "Phys. Rev. B 57, 1838 (1998).",
  "doi": "10.1103/PhysRevB.57.1838",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "We analyze the frequency-dependent current fluctuations induced into a gate near a quantum point contact or a quantum chaotic cavity. We use a current and charge conserving, effective scattering approach in which interactions are treated in random phase approximation. The current fluctuations measured at a nearby gate, coupled capacitively to the conductor, are determined by the screened charge fluctuations of the conductor. Both the equilibrium and the non-equilibrium current noise at the gate can be expressed with the help of resistances which are related to the charge dynamics on the conductor. We evaluate these resistances for a point contact and determine their distributions for an ensemble of chaotic cavities. For a quantum point contact these resistances exhibit pronounced oscillations with the opening of new channels. For a chaotic cavity coupled to one channel point contacts the charge relaxation resistance shows a broad distribution between 1/4 and 1/2 of a resistance quantum. The non-equilibrium resistance exhibits a broad distribution between zero and 1/4 of a resistance quantum.",
  "revisions": [
    {
      "version": "v1",
      "updated": "1997-07-09T13:22:20.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "quantum point contact",
      "chaotic cavity",
      "charge fluctuations",
      "broad distribution",
      "current fluctuations"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Phys. Rev. B"
    },
    "note": {
      "typesetting": "RevTeX",
      "pages": 9,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}