Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2006-03-20
Phys. Rev. E 74, 011104 (2006)
Physics
Condensed Matter
Statistical Mechanics
8 pages, 5 figures
Scientific paper
10.1103/PhysRevE.74.011104
We investigate the triangular-lattice antiferromagnetic Ising model with a spatially anisotropic next-nearest-neighbor ferromagnetic coupling, which was first discussed by Kitatani and Oguchi. By employing the effective geometric factor, we analyze the scaling dimensions of the operators around the Berezinskii-Kosterlitz-Thouless (BKT) transition lines, and determine the global phase diagram. Our numerical data exhibit that two types of BKT-transition lines separate the intermediate critical region from the ordered and disordered phases, and they do not merge into a single curve in the antiferromagnetic region. We also estimate the central charge and perform some consistency checks among scaling dimensions in order to provide the evidence of the six-state clock universality. Further, we provide an analysis of the shapes of boundaries based on the crossover argument.
Nomura Kiyohide
Okabe Yutaka
Otsuka Hiromi
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