Optical conductivity and kinetic energy of the superconducting state: A cluster dynamical mean field study

PACS 71.27.+a – Strongly correlated electron systems; heavy fermions PACS 71.30.+h – Metal-insulator transitions and other electronic transitions Abstract – We study the evolution of the optical conductivity in the t-J model with temperature and doping using the Cluster Dynamical Mean Field Method. The transition to the superconducting state in the overdoped regime is characterized by an increase in the kinetic energy of the system, in contrast to the underdoped side where kinetic energy of the system decreases upon condensation. In the underdoped and optimally doped regime, the optical conductivity displays anomalous transfers of spectral weight over a broad frequency region. Copyright c © EPLA, 2007 Introduction. – How superconductivity emerges from a strongly correlated normal state is one of the most important problems in the field of strongly correlated electron systems. One of the most powerful bulk probes of carrier dynamics is the optical conductivity. For example,