{
  "id": "1303.1333",
  "version": "v1",
  "published": "2013-03-06T13:51:27.000Z",
  "updated": "2013-03-06T13:51:27.000Z",
  "title": "Efficient MPS algorithm for periodic boundary conditions and applications",
  "authors": [
    "Michael Weyrauch",
    "Mykhailo V. Rakov"
  ],
  "comment": "7 pages, 3 figures, 3 tables, the article was accepted for Ukrainian Journal of Physics",
  "journal": "Ukr. J. Phys. (2013), Vol. 58, No. 7, pages 657-665",
  "categories": [
    "cond-mat.stat-mech"
  ],
  "abstract": "We present an implementation of an efficient algorithm for the calculation of the spectrum of one-dimensional quantum systems with periodic boundary conditions. This algorithm is based on a matrix product representation for quantum states (MPS), and a similar representation for Hamiltonians and other operators (MPO). It is significantly more efficient for systems of about 100 sites and more than for small quantum systems. We apply the formalism to calculate the ground state and first excited state of a spin-1 Heisenberg ring and deduce the size of the Haldane gap. The results are compared to previous high-precision DMRG calculations. Furthermore, we study spin-1 systems with a biquadratic nearest-neighbor interaction and show first results of an application to a mesoscopic Hubbard ring of spinless Fermions which carries a persistent current.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2013-03-06T13:51:27.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "periodic boundary conditions",
      "efficient mps algorithm",
      "application",
      "small quantum systems",
      "matrix product representation"
    ],
    "tags": [
      "journal article"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 7,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2013arXiv1303.1333W"
    }
  }
}