132 citations · 611 across the 17 of their papers we have counts for
12 papers · 1 filter
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…
Spin nematic order in multiple-spin exchange models on the triangular lattice
Tsutomu Momoi, Philippe Sindzingre, Kenn Kubo
We figure out that the ground state of a multiple-spin exchange model applicable to thin films of solid 3He possesses an octahedral spin nematic order. In the presence of magnetic…
Phase Diagram of Spinless Fermions on an Anisotropic Triangular Lattice at Half-filling
Chisa Hotta, Nobuo Furukawa, Akihiko Nakagawa +1
The strong coupling phase diagram of the spinless fermions on the anisotropic triangular lattice at half-filling is presented. The geometry of inter-site Coulomb interactions rules…
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-…
Flat-Bands on Partial Line Graphs -- Systematic Method for Generating Flat-Band Lattice Structures
Shin Miyahara, Kenn Kubo, Hiroshi Ono +2
We introduce a systematic method for constructing a class of lattice structures that we call ``partial line graphs''.In tight-binding models on partial line graphs, energy bands wi…
Ferromagnetism in the one-dimensional Hubbard model with orbital degeneracy: From low to high electron density
Harumi Sakamoto, Tsutomu Momoi, Kenn Kubo
We studied ferromagnetism in the one-dimensional Hubbard model with doubly degenerate atomic orbitals by means of the density-matrix renormalization-group method and obtained the g…
Magnetic Order in the Double Exchange Model in Infinite Dimensions
Kentaro Nagai, Tsutomu Momoi, Kenn Kubo
We studied magnetic properties of the double exchange (DE) model with S=1/2 localized spins at T=0, using exact diagonalization in the framework of the dynamical mean field theory.…
Electronic structure and resistivity of the double exchange model
D. M. Edwards, A. C. M. Green, K. Kubo
The double exchange (DE) model with quantum local spins S is studied; an equation of motion approach is used and decoupling approximations analogous to Hubbard's are made. Our appr…
Magnetism and Electronic States of Systems with Strong Hund Coupling
K. Kubo, D. M. Edwards, A. C. M. Green +2
This paper is a brief review of our recent studies concerning on magnetism and electronic states of lattice systems with Hund coupling. First we examined the effectiveness of the H…
Magnetization plateau in a two-dimensional multiple-spin exchange model
Tsutomu Momoi, Harumi Sakamoto, Kenn Kubo
We study a multiple-spin exchange model on a triangular lattice, which is a possible model for low-density solid 3He films. Due to strong competitions between ferromagnetic three-s…
Ferromagnetism in the Hubbard model with orbital degeneracy in infinite dimensions
Tsutomu Momoi, Kenn Kubo
We study the ferromagnetism due to orbital degeneracy in the Hubbard model in infinite dimensions. The model contains the intraorbital repulsion , the interorbital repulsion $U^…