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Coherent potential approximation for charge ordering in the extended Hubbard model

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Hoang,  Anh-Tuan
Max Planck Institute for the Physics of Complex Systems, 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): PII S0953-8984(02)35936-8, pp. 6639-6646. doi:10.1088/0953-8984/14/26/304.


Cite as: https://hdl.handle.net/21.11116/0000-0003-2A48-E
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.