A re-examination of the electronic structure of Bi₂Sr₂CaCu₂O_(8+d) and Bi₂Sr₂Cu₁O_(6+d) - An electron-like Fermi Surface and the absence of flat bands at E_F

We present a re-examination of the electronic structure and Fermi Surface (FS) of Bi-Sr-Ca-Cu-O (BSCCO) as obtained from angle-resolved photoemission experiments. By applying a stricter set of FS crossing criteria as well as by varying the incident photon energy outside the usual range, we have found very different behavior from that previously observed. In particular we have found an electron-like FS centered around the Gamma point, and the flat bands at E_F near the M point of the zone are absent. These results are robust over a large range of dopings and from single to double layer samples.