{
  "id": "cond-mat/0403129",
  "version": "v1",
  "published": "2004-03-03T17:23:14.000Z",
  "updated": "2004-03-03T17:23:14.000Z",
  "title": "Anti-Resonance and the 0.7 Anomaly in Conductance through a Quantum Point Contact",
  "authors": [
    "Ye Xiong",
    "X. C. Xie",
    "Shi-jie Xiong"
  ],
  "comment": "4 pages, 3 figures",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "We investigate the transmission of electrons through a quantum point contact by using a quasi-one-dimensional model with a local bound state below the band bottom. While the complete transmission in lower channels gives rise to plateaus of conductance at multiples of $2e^{2}/h$, the electrons in the lowest channel are scattered by the local bound state when it is singly occupied. This scattering produces a wide zero-transmittance (anti-resonance) for a singlet formed by tunneling and local electrons, and has no effect on triplets, leading to an exact $0.75(2e^{2}/h)$ shoulder prior to the first $2e^{2}/h$ plateau. Formation of a Kondo singlet from electrons in the Fermi sea screens the local moment and reduces the effects of anti-resonance, complementing the shoulder from 0.75 to 1 at low temperatures.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2004-03-03T17:23:14.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "quantum point contact",
      "anti-resonance",
      "local bound state",
      "conductance",
      "fermi sea screens"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 4,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2004cond.mat..3129X"
    }
  }
}