1. School of Materials and Physics, China University of Mining and Technology, Xuzhou 221116, China
2. Key Laboratory of Quantum Materials and Devices of Ministry of Education, School of Physics, Southeast University, Nanjing 211189, China
3. National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, 210093, Nanjing, China
4. School of Mathematics, China University of Mining and Technology, Xuzhou 221116, China