1. Institutes of Physical Science and Information Technology, Anhui University, Hefei, Anhui 230601, P. R. China
2. School of Physics and Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
3. School of Physical and Materials Science, Anhui University, Hefei, Anhui 230601, P. R. China
4. Department of Physics, Hefei National Laboratory for Physical Sciences at Microscale, and Key Laboratory of Strongly-Coupled Quantum Matter Physics (CAS), University of Science and Technology of China, Hefei, Anhui 230026, P. R. China