Appearance of Universal Metallic Dispersion in a Doped Mott Insulator
  We have investigated the dispersion renormalization $Z_{disp}$ in La$_{2-x}$Sr$_x$CuO$_4$ (LSCO) over the wide doping range of $x=0.03-0.30$, for binding energies extending to several hundred meV's. Strong correlation effects conspire in such a way that the system exhibits an LDA-like dispersion which essentially `undresses' ($Z_{disp}\to 1$) as the Mott insulator is approached. Our finding that the Mott insulator contains `nascent' or `preformed' metallic states with a vanishing spectral weight offers a challenge to existing theoretical scenarios for cuprates. 
S. Sahrakorpi, R.S. Markiewicz, Hsin Lin, M. Lindroos, X. J. Zhou, T.   Yoshida, W. L. Yang, T. Kakeshita, H. Eisaki, S. Uch...