4 citations · 6 across the 2 of their papers we have counts for
5 papers
Abnormal diffusion of a single vortex in the two dimensional XY model
Tomoaki Nogawa, Koji Nemoto
We study thermal diffusion dynamics of a single vortex in two dimensional XY model. By numerical simulations we find an abnormal diffusion such that the mobility decreases with tim…
Spatio-temporal scaling for out-of-equilibrium relaxation dynamics of an elastic manifold in random media: crossover between the Larkin regime and thermally activated regime
Tomoaki Nogawa, Koji Nemoto, Hajime Yoshino
We study relaxation dynamics of a three dimensional elastic manifold in random potential from a uniform initial condition by numerically solving the Langevin equation.We observe gr…
Nonequilibrium relaxation analysis of a quasi-one-dimensional frustrated XY model for charge-density waves in ring-shaped crystals
Tomoaki Nogawa, Koji Nemoto
We propose a model for charge density waves in ring shaped crystals, which depicts frustration between intra- and inter-chain couplings coming from cylindrical bending. It is then…
Ordered Phase of the Dipolar Spin Ice under [110]-Magnetic Fields
Shun-ichi Yoshida, Koji Nemoto, Koh Wada
We find that the true ground state of the dipolar spin ice system under [110]-magnetic fields is the ``Q=X'' structure, which is consistent with both experiments and Monte Carlo si…
Symmetry, complexity and multicritical point of the two-dimensional spin glass
Jean-Marie Maillard, Koji Nemoto, Hidetoshi Nishimori
We analyze models of spin glasses on the two-dimensional square lattice by exploiting symmetry arguments. The replicated partition functions of the Ising and related spin glasses a…