1. School of Computational Science and Electronics, Hunan Institute of Engineering, Xiangtan, People’s Republic of China
2. School of Physics and Electronics, Hunan University of Science and Technology, Xiangtan, People’s Republic of China
3. School of Physics and Mechanical & Electrical Engineering, Jishou University, Jishou, People’s Republic of China
4. School of Physics an Optoelectronics, Xiangtan University, Xiangtan, People’s Republic of China