1. International Laboratory for Quantum Functional Materials of Henan, and School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450001, P. R. China
2. Institute for Frontiers in Astronomy and Astrophysics, Department of Astronomy, Beijing Normal University, Beijing 100875, P. R. China
3. National Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle, College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, P. R. China