88 citations · 148 across the 5 of their papers we have counts for
5 papers
Mott transitions in the Hubbard model with spatially-modulated interactions
Akihisa Koga, Takamitsu Saitou, Atsushi Yamamoto
We study two-component fermions in optical lattices with spatially alternating on-site interactions using dynamical mean-field theory. Calculating the quasi-particle weight, double…
Metal-Insulator transition in optical lattice system with site-dependent interactions
Takamitsu Saitou, Akihisa Koga, Atsushi Yamamoto
We investigate the half-filled Hubbard model with spatially alternating interactions by means of the two-site dynamical mean-field theory. It is found that a single Mott transition…
Nonadiabatic Dynamics of Ultracold Fermions in Optical Superlattices
Atsushi Yamamoto, Makoto Yamashita, Norio Kawakami
We study the time-dependent dynamical properties of two-component ultracold fermions in a one-dimensional optical superlattice by applying the adaptive time-dependent density matri…
Z_2-vortex ordering of the triangular-lattice Heisenberg antiferromagnet
Hikaru Kawamura, Atsushi Yamamoto, Tsuyoshi Okubo
Ordering of the classical Heisenberg antiferromagnet on the triangular lattice is studied by means of a mean-field calculation, a scaling argument and a Monte Carlo simulation, wit…
Vortex-induced topological transition of the bilinear-biquadratic Heisenberg antiferromagnet on the triangular lattice
Hikaru Kawamura, Atsushi Yamamoto
The ordering of the classical Heisenberg antiferromagnet on the triangular lattice with the the bilinear-biquadratic interaction is studied by Monte Carlo simulations. It is shown…