Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-06-10
J. Phys. Soc. Jpn. 74 (2005) pp2769-2782
Physics
Condensed Matter
Strongly Correlated Electrons
28 pages, 8 figures
Scientific paper
10.1143/JPSJ.74.2769
The Hubbard model with additional intersite interaction `$V$' (the extended Hubbard model) is investigated by the correlator projection method (CPM). CPM is a newly developed numerical method which combines the equation-of-motion approach and the dynamical mean-field theory. Using this method, properties of the extended Hubbard Model at quarter filling are discussed with special emphasis on the metal-insulator transition induced by electron-electron correlations. The result shows a metal-insulator transition to a charge ordered insulator with antiferromagnetic order at low temperatures, but a charge ordered insulator without magnetic symmetry breaking at intermediate temperatures. Here, the magnetic order is found to be suppressed to low temperatures because of the smallness of the exchange coupling $J_{\rm eff}$. The present results are in sharp contrast with the Hatree-Fock approximation whereas in agreement with the experimental results on quarter-filled materials with strong correlations, such as organic conductors.
Hanasaki Kota
Imada Masatoshi
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