2008/03/04 by Satoshi Nishimoto, S. Nishimoto, M. Shingai +1
Materials Science · Physics and Astronomy · #Magnetism in coordination complexes #Organic and Molecular Conductors Research #Solid-state spectroscopy and crystallography #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.78.035113
9 pages, 7 figures
arxiv created 2008/03/04 · openalex publication_date 2008/07/14 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Using the Lanczos exact-diagonalization and density-matrix renormalization-group methods, we study the extended Hubbard model at quarter filling defined on the anisotropic triangular lattice. We focus on charge ordering (CO) phenomena induced by onsite and intersite Coulomb interactions. We determine the ground-state phase diagram including three CO phases, i.e., diagonal, vertical, and threefold CO phases, based on the calculated results of the hole density and double occupancy. We also calculate the dynamical density-density correlation functions and find possible coexistence of the diagonal and threefold charge fluctuations in a certain parameter region where the onsite and intersite interactions compete. Furthermore, the characteristic features of the optical conductivity for each CO phase are discussed.