Effects of off-site Coulomb interaction in a Hubbard model on a triangular lattice

Tsutomu Watanabe, Hisatoshi Yokoyama, Yukio Tanaka, Jun ichiro Inoue

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Half-filled-band extended Hubbard models on anisotropic triangular lattices are studied using a variational Monte Carlo method, with κ-(BEDT-TTF)2X in mind. Mott transitions are always observed at certain U. For the isotropic case, an antiferromagnetic (AF) order with 120° spin structure becomes dominant in the insulating regime. Introduction of intersite Coulomb interaction (V) only slightly affects the AF order, but a threefold charge order appears when V / U ≳ frac(1, 3). As for superconductivity, d2-, dxy-, and f2-wave pairing states, which form pairs on next-nearest-neighbor sites, are stabilized with respect to the normal state for large V.

Original languageEnglish
Pages (from-to)3372-3374
Number of pages3
JournalJournal of Physics and Chemistry of Solids
Issue number12
Publication statusPublished - 2008 Dec


  • A. Organic compounds
  • A. Superconductors
  • D. Electrical properties
  • D. Magnetic properties
  • D. Superconductivity

ASJC Scopus subject areas

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


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