1. Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong SAR 999077, China
2. Jiangsu Province Key Laboratory of Modern Measurement Technology and Intelligent Systems, School of Physics and Electronic Electrical Engineering, Huaiyin Normal University, Huaian 223300, China
3. School of Science and Engineering, The Chinese University of Hong Kong (Shenzhen), Shenzhen 518172, China