1. Department of Materials Science and Engineering, Hefei National Laboratory for Physical Science at Microscale, University of Science and Technology of China, Hefei 230026, China
2. Department of Materials Science and Engineering, Center of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
3. The Anhui High Magnetic Field Laboratory, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui 230031, China