Preformed pairs induced pseudogap behavior in high-T-c cuprates - art. no.064503

Pseudogap phenomena of high-T-c cuprates are examined based on the scenario of the precursor of the strong coupling superconductivity. The "pairing ap proximation" of the T-matrix formalism is used and a full self-consistent n umerical calculation is carried out. We show that the pseudogap opens at di fferent regions in the momentum space at different temperatures, which is c onsistent with the angle-resolved photoemission experiments. We also invest igate the dependences of the pseudogap on temperature, the coupling strengt h, and the hole concentration.