1. Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China
2. Key Laboratory of Thin Film and Microfabrication (Ministry of Education), Department of Micro/Nano Electronics, School of Electronic Information and Electrical Engineering, Center of Hydrogen Science, Shanghai Jiao Tong University, Shanghai 200240, China
3. State Key Laboratory of Quality Research in Chinese Medicine, Macau Institute for Applied Research in Medicine and Health, Macau University of Science and Technology, Avenida Wai Long, Taipa, Macao SAR, China