{
  "id": "cond-mat/9708197",
  "version": "v1",
  "published": "1997-08-26T06:12:59.000Z",
  "updated": "1997-08-26T06:12:59.000Z",
  "title": "Low-Lying Excitations in the S=1 Antiferromagnetic Heisenberg Chain",
  "authors": [
    "Shoji Yamamoto",
    "Seiji Miyashita"
  ],
  "comment": "11 pages, 6 Postscript figures, RevTex (to appear in Phys. Lett. A)",
  "doi": "10.1016/S0375-9601(97)00662-2",
  "categories": [
    "cond-mat.stat-mech"
  ],
  "abstract": "In order to confirm the picture of domain-wall excitations in the hidden antiferromagnetic order of the Haldane phase, the structure of the low-lying excitations in the S=1 antiferromagnetic Heisenberg chain is studied by a quantum Monte Carlo method. It is confirmed that there exists a finite energy gap between the first- and the second-excited states at $k=\\pi$ as well as between the ground state and the first-excited state at $k=\\pi$. In the thermodynamic limit, the second-excited state at $k=\\pi$ is separated from the ground state by the gap which is three times as large as the Haldane gap. From the size dependences of the low-lying-excitation energies, the interactions between the elementary excitations in the excited states are concluded to be repulsive.",
  "revisions": [
    {
      "version": "v1",
      "updated": "1997-08-26T06:12:59.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "antiferromagnetic heisenberg chain",
      "low-lying excitations",
      "ground state",
      "quantum monte carlo method",
      "finite energy gap"
    ],
    "tags": [
      "journal article"
    ],
    "note": {
      "typesetting": "RevTeX",
      "pages": 11,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}