QUASI-PARTICLE SPECTRAL WEIGHT OF CUPRATE OXIDE SUPERCONDUCTORS

Results are presented for the quasiparticle-spectral-weight function f or a two-dimensional tight-binding band in the normal and superconduct ing states. Comparison is made between s- and d-wave superconducting p hases. A quasiparticle damping mechanism, which has been proposed as a n explanation for recently observed features in superconducting tunnel ing experiments, is incorporated, as well as an additional inelastic s cattering rate that decreases rapidly upon entering the superconductin g state. Comparison is made with recent angle-resolved photoemission s pectroscopy.