1. State Key Laboratory of Infrared Physics Shanghai Institute of Technical Physics Chinese Academy of Sciences 500 Yu Tian Road Shanghai 200083 P. R. China
2. University of Chinese Academy of Sciences 19 Yu Quan Road Beijing 100049 P. R. China
3. Technical Center for Multifunctional Magneto‐Optical Spectroscopy (Shanghai) Engineering Research Center of Nanophotonics & Advanced Instrument (Ministry of Education) Department of Materials School of Physics and Electronic Science East China Normal University 500 Dongchuan Road Shanghai 200241 P. R. China
4. Donghua University 2999 North Renmin Road Shanghai 201620 P. R. China
5. Key Laboratory of Space Active Opto‐Electronics Technology Shanghai Institute of Technical Physics Chinese Academy of Sciences 500 Yu Tian Road Shanghai 200083 P. R. China
6. Hangzhou Institute for Advanced Study University of Chinese Academy of Sciences 1 Sub‐Lane Xiangshan Hangzhou 310024 P. R. China
7. Institute of Optoelectronics Fudan University 2005 Songhu Road Shanghai 200438 P. R. China