Phase separation in a two-band model for strongly correlated electrons

Abstract

The two-band Hubbard model is used to analyze a possibility of a non-uniform charge distribution in a strongly correlated electron system with two types of charge carriers. It is demonstrated that in the limit of strong on-site Coulomb repulsion, such a system has a tendency to phase separation into the regions with different charge densities even in the absence of magnetic or any other ordering. This tendency is especially pronounced if the ratio of the bandwidths is large enough. The characteristic size of inhomogeneities is estimated accounting for the surface energy and the electrostatic energy related to the charge imbalance.

14 pages, 5 figures, RevTeX

References in corpus (4)

• Complexity in Strongly Correlated Electronic Systems
• Phase separation due to quantum mechanical correlations
• Phase separation and the segregation principle in the infinite-U spinless Falicov-Kimball model
• Jahn-Teller distortions and phase separation in doped manganites

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