246 citations · 631 across the 19 of their papers we have counts for
12 papers · 1 filter
Position of Effective Spins Induced by Dilution in Two-Dimensional Spin-Peierls Systems
Chitoshi Yasuda, Shouta Miyara
The site- and bond-dilution effects of the nonmagnetic ground state of a two-dimensional antiferromagnetic Heisenberg model, coupled with the lattice distortions on a squar…
Spin-Wave Theory for the Scalar Chiral Phase in the Multiple-Spin Exchange Model on a Triangular Lattice
Shogo Taira, Chitoshi Yasuda, Tsutomu Momoi +1
We study the effects of quantum fluctuations on a non-coplanar tetrahedral spin structure, which has a scalar chiral order, in the spin-1/2 multiple-spin exchange model with up to…
Ground-State Phase Diagram of the Multiple-Spin Exchange Model with up to the Six-Spin Exchange Interactions on the Triangular Lattice
Chitoshi Yasuda, Yuma Uchihira, Shogo Taira +1
The ground state of the multiple-spin exchange model with up to the six-spin exchange interactions on a triangular lattice in the magnetic field is investigated within the mean-fie…
Quantum Phase Transition in Antiferromagnetic Heisenberg Chains Coupled to Phonons
Satoru Akiyama, Chitoshi Yasuda
We develop an analytical approach based on a unitary transformation to investigate S=1/2 antiferromagnetic Heisenberg chains coupled to phonons, and find a new quantum phase transi…
Local-Ansatz Approach with Momentum Dependent Variational Parameters to Correlated Electron Systems
Y. Kakehashi, T. Shimabukuro, C. Yasuda
A new wavefunction which improves the Gutzwiller-type local ansatz method has been proposed to describe the correlated electron system. The ground-state energy, double occupation n…
Spin-Wave Theory of the Multiple-Spin Exchange Model on a Triangular Lattice in a Magnetic Field : 3-Sublattice Structures
Chitoshi Yasuda, Daisuke Kinouchi, Kenn Kubo
We study the spin wave in the S=1/2 multiple-spin exchange model on a triangular lattice in a magnetic field within the linear spin-wave theory. We take only two-, three- and four-…