School of Physics science and Technology, Central South University, Changsha, China
School of Physics science and Technology, Central South University, Changsha, China
School of Physics science and Technology, Central South University, Changsha, China
School of Physics science and Technology, Central South University, Changsha, China
School of Physics science and Technology, Central South University, Changsha, China
Copyright © Jian Xiong, Bing-chu Yang, Cong-hua Zhou, Shun-gui Zuo, Li-jie Liang et al. This is
an open access article distributed under the Creative Commons Attribution
License, which permits unrestricted use, distribution, and reproduction in any
medium, provided the original work is properly cited.