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On the Optical Conductivity of Kondo Insulators
Authors:ZHU Li  LI Zhengzhong  XIAO Mingwen
Institution:1. Department of Physics, Nanjing university, Nanjing 210093, China; 2. Cryogenic Laboratory, The Chinese Academy of Sciences, Beijing 100080, China
Abstract:The temperature-dependent optical conductivity of a Kondo insulator for different temperatures with impurity doping on the conduction band is studied within the U = ∞ Anderson lattice model in the framework of a slave-boson mean-field theory under the coherent potential approximation. The results show that the depletion of the optical conductivity in low-frequency region decreases with increasing of the temperature, and the system exhibits a transition between a low-temperature insulating phase and a high-temperature metallic phase. With increasing of the impurity concentration, the effect of the impurity scattering could result in a nearly temperature-independent gap behavior. The numerical results on the localization of the electron and its variation with temperature are also discussed with the help of optical sum rule.
Keywords:heavy fermions  Kondo insulators  optical conductivity  
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