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