1. Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, People’s Republic of China
2. Micro-optoelectronic Systems Laboratories, Xi’an Technological University, Xi’an 710032, Shaanxi, People’s Republic of China
3. National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, Anhui, People’s Republic of China
4. School of Science, Xi’an Polytechnic University, Xi’an 710048, Shaanxi, People’s Republic of China
5. School of Science, Xi’an University of Architecture & Technology, Xi’an 710055, Shaanxi, People’s Republic of China
6. Center for Dielectric Studies,
Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802, United States