STUDY OF SPIN POLARONS IN EXTENDED T-J MODEL BY SELF-CONSISTENT BORN APPROXIMATION

By introducing the second and third neighbors t' and t '' terms to the pure t-J Hamiltonian, we could obtain the quasiparticle dispersion da ta which are consistent with the experimental results for Sr2CuO2Cl2. The correlation of hole motion with ferromagnetic correlations is auto matically included in our approach, thus leading to a experimentally o bserved asymmetry of the quasiparticle between k and k + (pi, pi).