1. Academy for Advanced Interdisciplinary Studies and Shenzhen Engineering Research Center for Frontier Materials Synthesis at High Pressures, Southern University of Science and Technology, Shenzhen 518055, P. R. China
2. Department of Physics, Southern University of Science and Technology, Shenzhen 518055, P. R. China
3. College of Science, Wuhan University of Science and Technology, Wuhan 430081, P. R. China