Optical properties of strongly correlated systems with spin-density-wave order

The dynamical conductivity sigma(omega), reflectivity R(omega), and tunneling density of states N(omega) of strongly correlated systems with the commensurate spin-density wave (SDW-CS) order are studied as a function of impurity scattering rate. The theory is based on the excitonic insulator model and it is generalized to include retardadion (strong coupling) and impurity effects on the SDW-CS order. The results are briefly discussed in the light of optical experiments on some heavy-fermion materials with the SDW order.