{
  "id": "1201.1957",
  "version": "v2",
  "published": "2012-01-10T02:34:31.000Z",
  "updated": "2012-06-27T09:39:46.000Z",
  "title": "Full counting statistics for orbital-degenerate impurity Anderson model with Hund's rule exchange coupling",
  "authors": [
    "Rui Sakano",
    "Yunori Nishikawa",
    "Akira Oguri",
    "Alex C. Hewson",
    "Seigo Tarucha"
  ],
  "comment": "5 pages, 3 figures",
  "journal": "Phys. Rev. Lett. 108, 266401 (2012)",
  "doi": "10.1103/PhysRevLett.108.266401",
  "categories": [
    "cond-mat.mes-hall",
    "cond-mat.str-el"
  ],
  "abstract": "We study non-equilibrium current fluctuations through a quantum dot, which includes a ferromagnetic Hund's rule coupling $J$, in the low-energy Fermi liquid regime using the renormalized perturbation theory. The resulting cumulant for the current distribution in the particle-hole symmetric case, shows that spin-triplet and spin-singlet pairs of quasiparticles are formed in the current due to the Hund's rule coupling and these pairs enhance the current fluctuations. In the fully screened higher-spin Kondo limit, the Fano factor takes a value $F_b = (9M+6)/ (5M+4)$ determined by the orbital degeneracy $M$. We also investigate crossover between the small and large $J$ limits in the two-orbital case M=2, using the numerical renormalization group approach.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2012-06-27T09:39:46.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "71.10.Ay",
      "71.27.+a",
      "72.15.Qm"
    ],
    "keywords": [
      "orbital-degenerate impurity anderson model",
      "hunds rule exchange coupling",
      "full counting statistics",
      "screened higher-spin kondo limit",
      "hunds rule coupling"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review Letters",
      "year": 2012,
      "month": "Jun",
      "volume": 108,
      "number": 26,
      "pages": 266401
    },
    "note": {
      "typesetting": "TeX",
      "pages": 5,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2012PhRvL.108z6401S"
    }
  }
}