34 citations · 188 across the 23 of their papers we have counts for
23 papers
Berezinskii-Kosterlitz-Thouless phase transitions of the antiferromagnetic Ising model with ferromagnetic next-nearest-neighbor interactions on the kagome lattice
Yutaka Okabe, Hiromi Otsuka
We investigate the six-state clock universality of the Ising model on the kagome lattice, considering antiferromagnetic nearest-neighbor (NN) and ferromagnetic next-nearest-neighbo…
BKT transitions of the XY and six-state clock models on the various two-dimensional lattices
Yutaka Okabe, Hiromi Otsuka
In a two-dimensional (2D) spin system, the XY model, characterized by planar rotational symmetry, exhibits a unique phenomenon known as the Berezinskii-Kosterlitz-Thouless (BKT) tr…
Comprehensive studies on the universality of BKT transitions -- Machine-learning study, Monte Carlo simulation, and Level-spectroscopy method
Hiromi Otsuka, Kenta Shiina, Yutaka Okabe
Comprehensive studies are made on the six-state clock universality of two models using several approaches. We apply the machine-learning technique of phase classification to the an…
Universal asymptotic correlation functions for point group and an observation for triangular lattice -state Potts model
Masafumi Fujimoto, Hiromi Otsuka
We investigate universal forms for asymptotic correlation functions of off-critical systems that possess symmetry following the argument for symmetry in Phys.~Rev…
Large peaks in the entropy of the diluted nearest-neighbor spin-ice model on the pyrochlore lattice in a [111] magnetic field
Petr Andriushchenko, Konstantin Soldatov, Alexey Peretyatko +4
We study the residual entropy of the nearest-neighbor spin-ice model in a magnetic field along the [111] direction using the Wang-Landau Monte Carlo method, with a special attentio…
Universal dynamics of magnetic monopoles in two-dimensional kagomé ice
Hiroshi Takatsu, Kazuki Goto, Hiromi Otsuka +8
A magnetic monopole in spin ice is a novel quasiparticle excitation in condensed matter physics, and we found that the ac frequency dependent magnetic susceptibility in the…