1. Hefei National Laboratory for Physical Sciences at Microscale, Department of Materials Science & Engineering, Collaborative Innovation Center of Suzhou Nano Science and Technology, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
2. The Anhui Key Laboratory of Condensed Matter
Physics at Extreme Conditions, High Magnetic Field Laboratory, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China