Wednesday, January 16, 2013

1301.3317 (Yang Zhao et al.)

Kosterlitz-Thouless phase transition and reentrance in an anisotropic
3-state Potts model on the generalized Kagome lattice
   [PDF]

Yang Zhao, Wei Li, Bin Xi, Zhe Zhang, Xin Yan, Shi-Ju Ran, Tao Liu, Gang Su
The unusual reentrant phenomenon is observed in the anisotropic 3-state Potts model on a gen- eralized Kagome lattice. By employing the linearized tensor renormalization group method, we find that the reentrance can appear in the region not only under a partial ordered phase as commonly known but also a phase without a local order parameter, which is uncovered to fall into the uni- versality of the Kosterlitz-Thouless (KT) type. The region of the reentrance depends strongly on the ratios of the next nearest couplings {\alpha} = J2 /|J1 | and {\beta} = J3 /|J1 |. The phase diagrams in the plane of temperature versus {\beta} for different {\alpha} are obtained. Through massive calculations, it is also revealed that the quasi-entanglement entropy can be used to accurately detect the KT transition temperature.
View original: http://arxiv.org/abs/1301.3317

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