The pseudogap and photoemission spectra in the attractive Hubbard model

Angle-resolved photoemission spectra are calculated microscopically for the two-dimensional attractive Hubbard model. A system of self-consistent T-ma trix equations are solved numerically in the real-time domain. The single-p article spectral function has a two-peak structure resulting from the prese nce of bound states. The spectral function is suppressed at the chemical po tential, leading to a pseudogap-like behaviour. At high temperatures and de nsities the pseudogap diminishes and finally disappears; these findings are similar to the experimental observations for the cuprates.