793 citations · 10.5k across the 194 of their papers we have counts for
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Effect of the Orbital Level Difference in Doped Spin-1 Chains
Beat Ammon, Masatoshi Imada
Doping of a two-orbital chain with mobile S=1/2 Fermions and strong Hund's rule couplings stabilizing the S=1 spins strongly depends on the presence of a level difference among the…
Spin-1 chain doped with mobile S=1/2 fermions
Beat Ammon, Masatoshi Imada
We investigate doping of a two-orbital chain with mobile fermions as a valid model for . The S=1 spins are stabilized by strong, ferromagnetic (fm)…
Optical Conductivity of the Two-Dimensional Hubbard Model
Hiroki Nakano, Masatoshi Imada
Charge dynamics of the two-dimensional Hubbard model is investigated. Lanczs-diagonalization results for the optical conductivity and the Drude weight of this model a…
Scaling Properties of Antiferromagnetic Transition in Coupled Spin Ladder Systems Doped with Nonmagnetic Impurities
Masatoshi Imada, Youichirou Iino
We study effects of interladder coupling on critical magnetic properties of spin ladder systems doped with small concentrations of nonmagnetic impurities, using the scaling theory…
Effects of Nonmagnetic Impurity Doping on Spin Ladder System
Youichirou Iino, Masatoshi Imada
Effects of nonmagnetic impurity doping on an AF spin-1/2 Heisenberg ladder system are studied by the QMC method. A single nonmagnetic impurity induces a localized spin-1/2 moment a…
Critical Exponents of the Metal-Insulator Transition in the Two-Dimensional Hubbard Model
Nobuo Furukawa, Fakher F. Assaad, Masatoshi Imada
We study the filling-controlled metal-insulator transition in the two-dimensional Hubbard model near half-filling with the use of zero temperature quantum Monte Carlo methods. In t…
Impurity Effect on Spin Ladder System
Yukitoshi Motome, Nobuyuki Katoh, Nobuo Furukawa +1
Effects of nonmagnetic impurity doping in a spin ladder system with a spin gap are investigated by the exact diagonalization as well as by the variational Monte Carlo calculations.…
Macroscopic Quantum Tunneling of a Fluxon in a Long Josephson Junction
Takeo Kato, Masatoshi Imada
Macroscopic quantum tunneling (MQT) for a single fluxon moving along a long Josephson junction is studied theoretically. To introduce a fluxon-pinning force, we consider inhomogene…
Superfluid-Insulator Transition of Interacting Multi-Component Bosons
Yukitoshi Motome, Masatoshi Imada
Various types of superfluid-insulator transitions are investigated for two-component lattice boson systems in two dimensions with on-site hard-core repulsion and the component-depe…
Spin Gap in Two-Dimensional Heisenberg Model for CaVO
Nobuyuki Katoh, Masatoshi Imada
We investigate the mechanism of spin gap formation in a two-dimensional model relevant to Mott insulators such as CaVO. From the perturbation expansion and quantum Monte Ca…