Nogawa, Tomoaki, Hasegawa, Takehisa
We discuss the nature of the two-stage percolation transition on the enhanced binary tree in order to explain the disagreement in the estimation of the second transition probability between the one...
Dynamical Study of Polydisperse Hard-Sphere System (2009)
Nogawa, Tomoaki, Ito, Nobuyasu, Watanabe, Hiroshi
We study the phase diagram and the phase transitions of a polydisperse hard-sphere system by nonequilibrium molecular dynamics simulations. It is clarified that the width of the coexistence phase...
Vortex stripe glass with self-generated randomness (2009)
Yoshino, Hajime, Nogawa, Tomoaki, Kim, Bongsoo
We found a finite temperature glass transition in the absence of quenched disorder in frustrated Josephson junction arrays (JJA) on a square lattice with anisotropic Josephson couplings by numerical...
Abnormal diffusion of a single vortex in the two dimensional XY model (2008)
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 time $t$ as $1/\ln t$....
Monte-Carlo simulation study of the two-stage percolation transition in enhanced binary trees (2008)
Nogawa, Tomoaki, Hasegawa, Takehisa
We perform Monte-Carlo simulations to study the Bernoulli ($p$) bond percolation on the enhanced binary tree which belongs to the class of nonamenable graphs with one end. Our numerical results show...
Vortex jamming in superconductors and granular rheology (2008)
Yoshino, Hajime, Nogawa, Tomoaki, Kim, Bongsoo
We demonstrate that a highly frustrated anisotropic Josephson junction array(JJA) on a square lattice exhibits a zero-temperature jamming transition, which shares much in common with those in...
Nogawa, Tomoaki, Nemoto, Koji, Yoshino, Hajime
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 growth of roughness...
Coupled Oscillators in Quenched Random Potential (2006)
Nogawa, Tomoaki, Yoshino, Hajime, Matsukawa, Hiroshi
We study a synchronization of coupled oscillators in quenched random potential by numerical simulations as a model of sliding charge density waves and flux line lattices. By changing external driving...
Coupled Oscillators in Quenched Random Potential (2006)
Nogawa, Tomoaki, Yoshino, Hajime, Matsukawa, Hiroshi
We study a synchronization of coupled oscillators in quenched random potential by numerical simulations as a model of sliding charge density waves and flux line lattices. By changing external driving...
Coupled Oscillators in Quenched Random Potential (2006)
Nogawa, Tomoaki, Yoshino, Hajime, Matsukawa, Hiroshi
We study a synchronization of coupled oscillators in quenched random potential by numerical simulations as a model of sliding charge density waves and flux line lattices. By changing external driving...
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 mapped to a three...
Possibility of the Solid-Fluid Transition in Moving Periodic Systems (2005)
Nogawa, Tomoaki, Yoshino, Hajime, Matsukawa, Hiroshi
The steady sliding state of periodic structures such as charge density waves and flux line lattices is numerically studied based on two and three dimensional driven random field XY models. We focus...