{
  "id": "cond-mat/0207539",
  "version": "v1",
  "published": "2002-07-22T23:44:19.000Z",
  "updated": "2002-07-22T23:44:19.000Z",
  "title": "Lowering of the Kinetic Energy in Interacting Quantum Systems",
  "authors": [
    "Burkhard Militzer",
    "E. L. Pollock"
  ],
  "comment": "4 pages, 5 figures, submitted to Phys. Rev. Lett., June, 2002",
  "doi": "10.1103/PhysRevLett.89.280401",
  "categories": [
    "cond-mat.stat-mech"
  ],
  "abstract": "Interactions never lower the ground state kinetic energy of a quantum system. However, at nonzero temperature, where the system occupies a thermal distribution of states, interactions can reduce the kinetic energy below the noninteracting value. This can be demonstrated from a first order weak coupling expansion. Simulations (both variational and restricted path integral Monte Carlo) of the electron gas model and dense hydrogen confirm this and show that in contrast to the ground state case, at nonzero temperature the population of low momentum states can be increased relative to the free Fermi distribution. This effect is not seen in simulations of liquid He-3.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2002-07-22T23:44:19.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "interacting quantum systems",
      "restricted path integral monte carlo",
      "nonzero temperature",
      "first order weak coupling expansion",
      "ground state kinetic energy"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Phys. Rev. Lett."
    },
    "note": {
      "typesetting": "TeX",
      "pages": 4,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}