FLEX Study on the compressibility of the two-dimensional Hubbard model

Kunihisa Morita, Hideaki Maebashi, Kazumasa Miyake

Research output: Contribution to journalConference articlepeer-review

2 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)547-549
Number of pages3
JournalPhysica B: Condensed Matter
Publication statusPublished - Mar 1 2002
EventInternational Conference on Strongly Correlated Electrons - Ann Arbor, MI, United States
Duration: Aug 6 2002Aug 6 2002

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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