Volume 77, Number 2, January 2007
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||18 January 2007|
Optical conductivity and kinetic energy of the superconducting state: A cluster dynamical mean field study
Department of Physics, Rutgers University - Piscataway, NJ 08854, USA
Accepted: 23 November 2006
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.
PACS: 71.27.+a – Strongly correlated electron systems; heavy fermions / 71.30.+h – Metal-insulator transitions and other electronic transitions
© Europhysics Letters Association, 2007
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