1. Key Laboratory of Infrared Imaging Materials and Detector, Shanghai Institute of Technical Physics, Chinese Academy of Science, Shanghai 200083, China
2. University of Chinese Academy of Sciences, Beijing 100049, China
3. School of Physical Sciences, CAS Key Laboratory of Vacuum Physics, University of Chinese Academy of Sciences, Beijing 100049, China
4. Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China