[1] City Univ Hong Kong, COSDAF, 83 Tat Chee Ave, Hong Kong, Hong Kong, Peoples R China
[2] City Univ Hong Kong, Dept Phys & Mat Sci, Hong Kong, Hong Kong, Peoples R China
[3] Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai Synchrotron Radiat Facil, Shanghai 201800, Peoples R China
[4] City Univ Hong Kong, Shenzhen Res Inst, Shenzhen, Peoples R China