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Tsuyoshi Okubo , Hikaru Kawamura

… 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. …

J Phys Soc Jpn 79(8), 084706-084706-6, 2010-08-15

The Physical Society of Japan

Kawamura Hikaru , Yamamoto Atsushi , Okubo Tsuyoshi

… Ordering of the classical Heisenberg antiferromagnet on the triangular lattice is studied by means of a mean-field calculation, a scaling argument and a Monte Carlo simulation, with special attention to its vortex degree of freedom. … The model exhibits a thermodynamic transition driven by the $Z_{2}$-vortex binding-unbinding, at which various thermodynamic quantities exhibit an essential singularity. …

J Phys Soc Jpn 79(2), 023701-023701-4, 2010-02-15

The Physical Society of Japan Cited by (1)