Isotropic spin-1 chains with bond alternation: Analytic and numerical studies

K. Totsuka, Y. Nishiyama, N. Hatano, M. Suzuki

Research output: Contribution to journalArticle

75 Citations (Scopus)

Abstract

Isotropic spin-1 chains with bond alternation are studied. Analytic (both variational and perturbative) results are presented. A phase transition is found to separate the S=1 Haldane phase and the dimer phase. The critical point is numerically determined using the Binder parameter. The universality class is predicted to be given by the level-1 SU(2) Wess-Zumin-Witten model, and this prediction is supported by the present exact diagonalization study. The dimer phase is found to be connected to the "S=2" Haldane phase in a special limit. The change of the excitation spectra and the string order parameter with bond alternation is discussed.

Original languageEnglish
Article number014
Pages (from-to)4895-4920
Number of pages26
JournalJournal of Physics: Condensed Matter
Volume7
Issue number25
DOIs
Publication statusPublished - 1995

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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