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Hole Dynamics in Two-Dimensional Antiferromagnetic Mott Insulators
F. F. Assaad, M. Imada
The dispersion relation of a doped hole in the half-filled 2D Hubbard model is shown to follow a k^4 law around the (0,pi) and (pi,0) points in the Brillouin zone. Upon addition of…
Effects of Electron Correlation, Orbital Degeneracy and Jahn-Teller Coupling in Perovskite Manganites
Yukitoshi Motome, Masatoshi Imada
Roles of Coulomb interaction, orbital degeneracy and Jahn-Teller coupling in double-exchange models are examined for Mn perovskite oxides. We study the undoped Mott insulator as we…
Metal-Insulator and Superconductor-Insulator Transitions in Correlated Electron Systems
Masatoshi Imada, Fakher F. Assaad, Hirokazu Tsunetsugu +1
Quantum transitions between the Mott insulator and metals by controlling filling in two-dimensional square lattice are characterized by a large dynamical exponent where the o…
Numerical Study for the Ground State of Multi-Orbital Hubbard Models
Yukitoshi Motome, Masatoshi Imada
Ground state properties of multi-orbital Hubbard models are investigated by the auxiliary field quantum Monte Carlo method. A Monte Carlo technique generalized to the multi-orbital…
Dynamic Exponent of t-J and t-J-W Model
Hirokazu Tsunetsugu, Masatoshi Imada
Drude weight of optical conductivity is calculated at zero temperature by exact diagonalization for the two-dimensional t-J model with the two-particle term, . For the ordinary…