QUASI-PARTICLE BANDS IN THE REALISTIC BILAYER CUPRATES

We calculate the dispersion relation of the single hole for the realis tic bilayer t-J model within the self-consistent Born approximation ta king into account both many-body effects and the local-density approxi mation band structure. We show that the many-body effects strongly red uce the band splitting. The large excitation energy arising at (pi,0), compared with the pure t-J model, results from the specific band stru cture where the function of in-plane hopping terms are dominant. Our r esults are similar to the angle-resolved photoemission data of the sin gle-layer antiferromagnetic insulator Sr2CuO2Cl2, and suggests that in the presence of strong many-body effects the role of the interlayer c ouplings in forming the quasiparticle bands is significantly suppresse d.