1. Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
2. The Centre for Physical Experiments, University of Science and Technology of China, Hefei, Anhui 230026, China
3. Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang, Sichuan, 621900, China
4. Key Laboratory of Strongly-Coupled Quantum Matter Physics, Chinese Academy of Sciences, School of Physical Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China