1. Key Laboratory for Physical Electronics and Devices (MoE) & Shaanxi Key Lab of Information Photonic Technique School of Electronic Science and Engineering Xi'an Jiaotong University Xi'an 710049 China
2. Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education & International Center for Dielectric Research School of Electronic Science and Engineering Xi'an Jiaotong University Xi'an 710049 China
3. School of Microelectronics Fudan University Shanghai 200433 China
4. Shanghai Synchrotron Radiation Facility (SSRF) Zhangjiang Lab Shanghai Advanced Research Institute Shanghai Institute of Applied Physics (CAS) Shanghai 201204 China
5. Center for Excellence in Nanoscience (CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication (CAS) National Center for Nanoscience and Technology Beijing 100190 China
6. Collaborative Innovation Center of Extreme Optics Shanxi University Taiyuan 030006 China
7. Department of Materials Science and Engineering City University of Hong Kong Kowloon 999077 Hong Kong
8. Department of Chemistry City University of Hong Kong Kowloon 999077 Hong Kong
9. Hong Kong Institute for Clean Energy (HKICE) City University of Hong Kong Kowloon 999077 Hong Kong
10. Department of Materials Science and Engineering University of Washington Seattle WA 98195 USA