Collective phenomena in correlated electron systems: superconductivity and density waves

Interaction between electrons in “strongly correlated materials” is associated with many scientifically important and technologically useful phenomena, including superconductivity and exotically ordered charge and spin phases. I will review the recent advances of Raman spectroscopy aimed to characterize these extraordinary self-organized electronic phases, determine the condition under which they are formed, identify the underlying microscopic mechanisms, and test the relevant theories.\\[2mm] Research at Rutgers was done in collaboration with H.-H. Kung, S.-F. Wu, M. Ye, Weilu Zhang.