793 citations · 10.5k across the 194 of their papers we have counts for
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Operator projection method applied to the single-particle Green's function in the Hubbard model
Shigeki Onoda, Masatoshi Imada
A new non-perturbative framework for many-body correlated systems is formulated by extending the operator projection method (OPM). This method offers a systematic expansion which e…
Pseudogap and Kinetic Pairing Under Critical Differentiation of Electrons in Cuprate Superconductors
Masatoshi Imada, Shigeki Onoda
Superconducting mechanism of cuprates is discussed in the light of the proximity of the Mott insulator. The proximity accompanied by suppression of coherence takes place in an inho…
Path-Integral Renormalization Group Method for Numerical Study of Strongly Correlated Electron Systems
Masatoshi Imada, Tsuyoshi Kashima
A numerical algorithm for studying strongly correlated electron systems is proposed. The groundstate wavefunction is projected out after numerical renormalization procedure in the…
Doped two orbital chains with strong Hund's rule couplings - ferromagnetism, spin gap, singlet and triplet pairings
Beat Ammon, Masatoshi Imada
Different models for doping of two-orbital chains with mobile fermions and strong, ferromagnetic (FM) Hund's rule couplings stabilizing the S=1 spins are investigated by de…
Pseudogap and Superconducting Fluctuations in High-Tc Cuprates
Shigeki Onoda, Masatoshi Imada
We analyze pseudogap phenomena widely observed in the underdoped cuprates. We assume the existence of a strong d-wave pairing force competing with antiferromagnetic(AFM) fluctuatio…
Theory of Electron Differentiation, Flat Dispersion and Pseudogap Phenomena
Masatoshi Imada, Shigeki Onoda
Aspects of electron critical differentiation are clarified in the proximity of the Mott insulator. The flattening of the quasiparticle dispersion appears around momenta and…