Exact diagonalization study on the extended Hubbard model in an anisotropic triangular lattice

Ken Kanada, Tsutomu Watanabe, Seiichiro Onari, Yukio Tanaka

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A half-filled-band extended Hubbard model on an anisotropic triangular lattice is studied, using an exact diagonalization method, with κ-(BEDT-TTF)2X in mind. In the isotropic case, the charge fluctuation of (2 π / 3, 2 π / 3) is enhanced by the introduction of off-site Coulomb interaction (V). In the case of V = 0, the antiferromagnetic (AF) fluctuation is sizable for small frustration. However, when V is introduced, the AF fluctuation is rapidly suppressed and becomes substantially small, irrespective of the strength of frustration. Thus, it is revealed that both spin and charge fluctuations are sensitive to the shifts of t / t and V / t.

Original languageEnglish
Pages (from-to)3334-3336
Number of pages3
JournalJournal of Physics and Chemistry of Solids
Issue number12
Publication statusPublished - Dec 1 2008



  • A. Organic compounds
  • D. Charge-density waves
  • D. Spin-density waves

ASJC Scopus subject areas

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

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