One-electron spectral functions of the attractive Hubbard model at intermediate coupling

We calculate the one-electron spectral function of the attractive-U Hubbard model in two dimensions. We work in the intermediate coupling and low-dens ity regime and evaluate analytically the self energy. The results are obtai ned in a framework based on the self-consistent T-matrix approximation. We also calculate the chemical potential of the bound pairs as a function of t emperature. On the basis of this calculation we analyze the low-temperature resistivity and specific heat in the normal state of this system. We compa re our results with recent beautiful tunneling experiments in the underdope d regime of HTSC-materials. (C) 2000 Elsevier Science B.V. All rights reser ved.