Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2010-04-27
J. Phys. Soc. Jpn. 79, 084706 (2010)
Physics
Condensed Matter
Statistical Mechanics
7 pages, 6 figures
Scientific paper
10.1143/JPSJ.79.084706
Dynamical properties of the classical Heisenberg antiferromagnet on the triangular lattice are investigated by means of a spin-dynamics simulation and an analytical calculation. While the model was suggested to exhibit a topological transition driven by the Z_2-vortex binding-unbinding, weakness of the associated thermodynamic singularity has made it difficult to observe the evidence of the Z_2 vortex experimentally so far, only some indirect support. Here, we show that the signature of the Z_2-vortex excitation and the vortex-induced topological transition can be captured from the dynamical spin correlations. In particular, the dynamical spin structure factor exhibits a characteristic central peak around the Z_2-vortex transition, and this central peak will be a fingerprint of the Z_2-vortex excitation.
Kawamura Hikaru
Okubo Tsuyoshi
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