Charge order and superconductivity in two-dimensional triangular lattice at n = 2/3

Hiroshi Watanabe*, Masao Ogata

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)


To investigate the possibility of charge order and superconductivity in a doped two-dimensional triangular lattice, we study an extended Hubbard model with the variational Monte Carlo method. At n = 2/3, a commensurate filling for a triangular lattice, it is shown that the nearest-neighbor Coulomb interaction V induces honeycomb-type charge order and antiferromagnetic spin order at U ≳ 10t. We also discuss the possibility of superconductivity induced by charge fluctuation and the relation to the superconductivity in Na 0.35CoO2·1.3H2O and θ-type organic condoctors.

Original languageEnglish
Pages (from-to)2901-2904
Number of pages4
JournalJournal of the Physical Society of Japan
Issue number11
Publication statusPublished - 2005 Nov
Externally publishedYes


  • θ-type organic conductor
  • Charge fluctuation
  • Charge order
  • NaCoO ·1.3HO
  • Superconductivity
  • Variational Monte Carlo method

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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