From an antiferromagnet to a valence bond solid: Evidence for a first-order phase transition

Published

Journal Article

Using a loop-cluster algorithm we investigate the spin- Heisenberg antiferromagnet on a square lattice with exchange coupling J and an additional four-spin interaction of strength Q. We confirm the existence of a phase transition separating antiferromagnetism at J/Q>Jc/Q from a valence bond solid (VBS) state at J/QJc/Q the staggered magnetization, the spin stiffness and the spinwave velocity of the antiferromagnet are determined by fitting Monte Carlo data to analytic results from the systematic low-energy effective field theory for magnons. Finally, we also investigate the physics of the VBS state at J/Q

Full Text

Duke Authors

Cited Authors

  • Jiang, FJ; Nyfeler, M; Chandrasekharan, S; Wiese, UJ

Published Date

  • February 1, 2008

Published In

Volume / Issue

  • 2008 / 2

Electronic International Standard Serial Number (EISSN)

  • 1742-5468

International Standard Serial Number (ISSN)

  • 1742-5468

Digital Object Identifier (DOI)

  • 10.1088/1742-5468/2008/02/P02009

Citation Source

  • Scopus