Doping dependence of the band structure of Bi2212

Adam Kaminski

Physics and Astronomy, Ames Laboratory/Iowa State University, Ames, IA 50011, USA

We present careful study of doping dependence of the band structure of Bi2212 high temperature superconductor. Our study reveals many fine details that were not noticed before. We use this data to understand the spectrum of collective excitations present in this and other cuprate materials. Relation of this study to recent debate about doping dependence of the collective mode present in Bi2212 will also be discussed.