Abstract
Abstract We investigate, on the basis of the fluctuation exchange (FLEX) approximation, a hole-number dependence of the compressibility in the two-dimensional t–t′–U Hubbard model. We choose a value of U near the critical Coulomb interaction of the antiferromagnetic transition, where the shape of the renormalized Fermi surface is deformed showing the tendency of nesting. It is found that, near half-filling, the charge susceptibility χc=∂n/∂μ is larger about three times than the value given by the renormalized RPA, χc=Π0/(1+UΠ0), where Π0 is the polarization function calculated by FLEX approximation.
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