Coherent potential approximation for charge ordering in the extended Hubbard 
model

Hoang, A. T.; Thalmeier, P.

doi:10.1088/0953-8984/14/26/304

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Coherent potential approximation for charge ordering in the extended Hubbard model

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Thalmeier, P.
Peter Thalmeier, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Hoang, A. T., & Thalmeier, P. (2002). Coherent potential approximation for charge ordering in the extended Hubbard model. Journal of Physics-Condensed Matter, 14(26), 6639-6646. doi:10.1088/0953-8984/14/26/304.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0015-312B-8

Abstract

We study charge ordering (CO) in the extended Hubbard model with both on-site and nearest-neighbour Coulomb repulsion (U and V, respectively) within the coherent potential approximation. The phase boundary between the homogeneous and charge-ordered phases for the square lattice is obtained for different values of U. It is shown that at quarter-filling for all values of U the CO exists only if the inter-site Coulomb repulsion V exceeds certain a critical value which is of the order of the kinetic energy t. At finite temperature a re- entrant transition is found in some region of V.