Study of hole pair condensation based on the SU(2) slave-boson approach tothe t-J Hamiltonian; Temperature, momentum and doping dependences of spectral functions

Based on the U(1) and SU(2) slave-boson approaches to the t-J Hamiltonian, we evaluate the one electron spectral functions for the hole doped high T-c cuprates for comparison with the angle resolved photoemission spectroscopy (ARPES) data. We find that the observed quasiparticle peak in the supercond ucting state is correlated with the hump which exists in the normal state. We End that the spectral weight of the quasiparticle peak increases as dopi ng rate increases, which is consistent with observation. As a consequence o f the phase fluctuation effects qi the spinon and holon pairing order param eters the spectral weight of the predicted peak obtained from the SU(2) the ory is found to be smaller than the one predicted from U(1) mean field theo ry.