1. School of Computational Science and Electronics, Hunan Institute of Engineering, Xiangtan 411104, China
2. School of Physics and Electronics, Central South University, Changsha 410083, China
3. College of Mechanical Engineering, Hunan Institute of Engineering, Xiangtan 411104, China
4. College of Materials Science and Engineering, Changsha University of Science and Technology, Changsha 410083, China