Phase Separation Induced by Density-Dependent Hopping Terms

Abstract

We study phase separation in the $t-t^{\prime }-J$ model in which the constraint of no double occupancy due to strong electron correlations leads to effective narrowing of the band width. Using a mean-field approximation, we calculate the compressibility in the normal state and show that the phase separation can be induced by the variation of the band width.

6 pages, 3 figures