Improved wave functions for Hubbard model: Superconductivity and Mott transition

Kenji Kobayashi, Hisatoshi Yokoyama

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


We extend the doublon-holon binding wave function, which was recently often used to consider Mott transitions and dx2 - y2-wave superconductivity, for the half-filled-band Hubbard model on square lattices with the diagonal hopping t′. We introduce two new features: (1) In the doublon-holon binding factor, more accurate configuration correlations are included. (2) The band renormalization effect owing to the electron correlation is introduced within the third-neighbor hopping, including the anisotropy between x- and y-directions in the nearest-neighbor hopping. Using an optimization variational Monte Carlo technique, we draw some definite answers to the topics concerning the above features.

Original languageEnglish
Pages (from-to)141-145
Number of pages5
JournalPhysica C: Superconductivity and its Applications
Issue numberSUPPL.
Publication statusPublished - 2007 Oct 1


  • Cuprate
  • Hubbard model
  • Mott transition
  • Variational Monte Carlo method


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