[1] Hong Kong Univ Sci & Technol, Nano Sci & Technol NSNT Program, Kowloon, Clear Water Bay, Hong Kong, Peoples R China
[2] Shenzhen Shineway Hitech, Shenzhen, Peoples R China
[3] Guangzhou HKUST Fok Ying Tung Res Inst, Guangzhou, Guangdong, Peoples R China
[4] Hong Kong Univ Sci & Technol, Dept Phys, Kowloon, Clear Water Bay, Hong Kong, Peoples R China