{
  "id": "cond-mat/0104103",
  "version": "v1",
  "published": "2001-04-06T07:07:44.000Z",
  "updated": "2001-04-06T07:07:44.000Z",
  "title": "Andreev reflection through a quantum dot coupled with two ferromagnets and a superconductor",
  "authors": [
    "Yu Zhu",
    "Qing-feng Sun",
    "Tsung-han Lin"
  ],
  "comment": "15 pages, 7 figures, LaTeX",
  "doi": "10.1103/PhysRevB.65.024516",
  "categories": [
    "cond-mat.mes-hall",
    "cond-mat.supr-con"
  ],
  "abstract": "We study the Andreev reflection (AR) in a three terminal mesoscopic hybrid system, in which two ferromagnets (F$_1$ and F$_2$) are coupled to a superconductor (S) through a quantum dot (QD). By using non-equilibrium Green function, we derive a general current formula which allows arbitrary spin polarizations, magnetization orientations and bias voltages in F$_1$ and F$_2$. The formula is applied to study both zero bias conductance and finite bias current. The current conducted by crossed AR involving F$_1$, F$_2$ and S is particularly unusual, in which an electron with spin $\\sigma $ incident from one of the ferromagnets picks up another electron with spin $\\bar{\\sigma}$ from the other one, both enter S and form a Cooper pair. Several special cases are investigated to reveal the properties of AR in this system.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2001-04-06T07:07:44.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "andreev reflection",
      "quantum dot",
      "ferromagnets",
      "superconductor",
      "terminal mesoscopic hybrid system"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Phys. Rev. B"
    },
    "note": {
      "typesetting": "LaTeX",
      "pages": 15,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}