{
  "id": "cond-mat/0004207",
  "version": "v1",
  "published": "2000-04-13T06:52:30.000Z",
  "updated": "2000-04-13T06:52:30.000Z",
  "title": "Equilibrium and dynamical properties of the ANNNI chain at the multiphase point",
  "authors": [
    "Abhishek Dhar",
    "B. Sriram Shastry",
    "Chandan Dasgupta"
  ],
  "comment": "9 pages, RevTex, 6 figures (To appear in Phys. Rev. E)",
  "doi": "10.1103/PhysRevE.62.1592",
  "categories": [
    "cond-mat.stat-mech"
  ],
  "abstract": "We study the equilibrium and dynamical properties of the ANNNI (axial next-nearest-neighbor Ising) chain at the multiphase point. An interesting property of the system is the macroscopic degeneracy of the ground state leading to finite zero-temperature entropy. In our equilibrium study we consider the effect of softening the spins. We show that the degeneracy of the ground state is lifted and there is a qualitative change in the low temperature behaviour of the system with a well defined low temperature peak of the specific heat that carries the thermodynamic ``weight'' of the ground state entropy. In our study of the dynamical properties, the stochastic Kawasaki dynamics is considered. The Fokker-Planck operator for the process corresponds to a quantum spin Hamiltonian similar to the Heisenberg ferromagnet but with constraints on allowed states. This leads to a number of differences in its properties which are obtained through exact numerical diagonalization, simulations and by obtaining various analytic bounds.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2000-04-13T06:52:30.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "dynamical properties",
      "multiphase point",
      "annni chain",
      "equilibrium",
      "quantum spin hamiltonian similar"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Phys. Rev. E"
    },
    "note": {
      "typesetting": "RevTeX",
      "pages": 9,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}