Variational ground state of a two-orbital Hubbard model

Kenji Kobayashi, Hisatoshi Yokoyama

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


An optimization variational Monte Carlo method is formulated for a two-dimensional Hubbard model with doubly degenerate atomic orbitals. We use generalized Gutzwiller-type wave functions, which include all the possible intra-atomic correlations. As a demonstration, we show results of energy and some correlation functions for a special case; at a quarter filling and for large Coulomb interactions, a ferromagnetic state with an orbital order overcomes paramagnetic and superconducting states. However, this ferromagnetism is destabilized by electron doping or by introducing a diagonal transfer in one direction, both of which work as substantial frustrations.

Original languageEnglish
Pages (from-to)1384-1387
Number of pages4
JournalJournal of Physics and Chemistry of Solids
Issue number8-9
Publication statusPublished - 2005 Aug


  • A. Oxides
  • D. Electronic structure
  • D. Magnetic properties
  • D. Super conductivity

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics


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