1. Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
2. Department of Chemistry, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
3. Department of Earth and Planetary Sciences, Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, United States
4. HKUST Fok Ying Tung Research Institute, No. 2 Huan Shi Da Dao Road, Nansha District, Guangzhou City, 511458, China