Observation of an unconventional metal-insulator transition in overdoped   CuO_2 compounds
  The electron dynamics in the normal state of Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$ is studied by inelastic light scattering over a wide range of doping. A strong anisotropy of the electron relaxation is found which cannot be explained by single-particle properties alone. The results strongly indicate the presence of an unconventional quantum-critical metal-insulator transition where "hot" (antinodal) quasiparticles become insulating while "cold" (nodal) quasiparticles remain metallic. A phenomenology is developed which allows a quantitative understanding of the Raman results and provides a scenario which links single- and many-particle properties. 
F. Venturini, M. Opel, T. P. Devereaux, J. K. Freericks, I.   T\"utt\H{o}, B. Revaz, E. Walker, H. Berger, L. Forr\'o, and R...