1. Hefei National Laboratory for Physical Science at Microscale and Department of Materials Science & Engineering University of Science and Technology of China Hefei 230026 China
2. Department of Materials Science and Engineering Center of Super-Diamond and Advanced Films City University of Hong Kong Kowloon, Hong Kong China
3. Department of Chemistry Tsinghua University Beijing China
4. Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Condition High Magnetic Field Laboratory of Chinese Academy of Science Hefei 230031 China