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Most studies of square-lattice Hubbard models in view of cuprate superconductors hitherto have neglected a band-renormalization effect (BRE) owing to strong electron correlation, especially, for an antiferromagnetic (AF) order. In this study, we introduce BRE into a d-wave superconducting and an AF states independently in the framework of many-body variation theory. It is found that, in sharp contrast...
Intrinsic stability as to phase separation of an antiferromagnetic state is studied for a strongly correlated Hubbard model with frustration (t-t’-U model) near half filling, using a variational Monte Carlo method. In the Hartree-Fock (one-body) part of the many-body trial state, band-renormalization effect, which is necessary for partly recovering the nesting condition, is introduced up to three-step...
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