Charge Ordered Insulator without Magnetic Order Studied by Correlator Projection Method

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dc.creatorHanasaki, Kota
dc.creatorImada, Masatoshi
dc.date2005-06-10
dc.date.accessioned2026-07-07T06:21:54Z
dc.date.available2026-07-07T06:21:54Z
dc.descriptionThe 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.
dc.description28 pages, 8 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0506240
dc.identifierhttp://arxiv.org/abs/cond-mat/0506240
dc.identifierJ. Phys. Soc. Jpn. 74 (2005) pp2769-2782
dc.identifierdoi:10.1143/JPSJ.74.2769
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/95750
dc.subjectStrongly Correlated Electrons
dc.titleCharge Ordered Insulator without Magnetic Order Studied by Correlator Projection Method
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