Affiliation: | 1. National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China 2. National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China;Institute for Materials Research, Tohoku University, Sendai, Japan 3. Institute for Materials Research, Tohoku University, Sendai, Japan 4. Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China |