1. School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
2. Laboratory of Micro-Nano Optoelectronic Materials and Devices, Key Laboratory of Materials for High-Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
3. National Institute for Materials Science (NIMS), Tsukuba 305-0003, Japan
4. State Key Laboratory of Crystal Materials and Institute of Crystal Materials, Shandong University, Jinan 250100, China
5. Department of Physics, Center for Ion Beam Application and Center for Electron Microscopy, Wuhan University, Wuhan 430072, China
6. Japan Atomic Energy Agency (JAEA), Tokai 319-1195, Japan