1. School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
2. Singapore Synchrotron Light Source, National University of Singapore, 5 Research Link, Singapore 117603, Singapore
3. SZU-NUS Collaborative Innovation Center for Optoelectronic Science and Technology, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
4. Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039, China
5. Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China