{
  "id": "1204.5738",
  "version": "v2",
  "published": "2012-04-25T19:53:22.000Z",
  "updated": "2013-02-02T03:39:07.000Z",
  "title": "Thermodynamics of ultrasmall metallic grains in the presence of pairing and exchange correlations: Mesoscopic fluctuations",
  "authors": [
    "Konstantin N. Nesterov",
    "Y. Alhassid"
  ],
  "comment": "14 pages, 7 figures",
  "journal": "Phys. Rev. B 87, 014515 (2013)",
  "doi": "10.1103/PhysRevB.87.014515",
  "categories": [
    "cond-mat.mes-hall",
    "cond-mat.str-el",
    "nucl-th"
  ],
  "abstract": "We study the mesoscopic fluctuations of thermodynamic observables in a nanosized metallic grain in which the single-particle dynamics are chaotic and the dimensionless Thouless conductance is large. Such a grain is modeled by the universal Hamiltonian describing the competition between exchange and pairing correlations. The exchange term is taken into account exactly by a spin-projection method, and the pairing term is treated in the static-path approximation together with small-amplitude quantal fluctuations around each static fluctuation of the pairing field. Odd-even particle-number effects induced by pairing correlations are included using a number-parity projection. We find that the exchange interaction shifts the number-parity effects in the heat capacity and spin susceptibility to lower temperatures. In the regime where the pairing gap is similar to or smaller than the single-particle mean level spacing, these number-parity effects are suppressed by exchange correlations, and the fluctuations of the spin susceptibility may be particularly large. However, for larger values of the pairing gap, the number-parity effects may be enhanced by exchange correlations.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2013-02-02T03:39:07.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "74.78.Na",
      "74.25.Bt",
      "75.75.-c",
      "05.30.Fk"
    ],
    "keywords": [
      "exchange correlations",
      "ultrasmall metallic grains",
      "mesoscopic fluctuations",
      "number-parity effects",
      "thermodynamic"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review B",
      "year": 2013,
      "month": "Jan",
      "volume": 87,
      "number": 1,
      "pages": "014515"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 14,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1112298,
      "adsabs": "2013PhRvB..87a4515N"
    }
  }
}