Abstract
The electronic structure of high-Tc copper oxides is investigated by the optical reflectivity spectra focusing on the evolution of the low-energy spectrum with doping and on the nature of the metallic state realized by the doping. The experimental results indicate that rapid rearrangement is occuring on doping from the conduction and valence band states of the original charge-transfer insulator and thus reconstructed state is not ordinary Fermi liquid in the high-Tc regime.
