1. Department of Physics, School of Physics and Materials Science, Nanchang University 1 , Nanchang 330031, China
2. Jiangxi Provincial Key Laboratory of Fusion and Information Control, Nanchang University 2 , Nanchang 330031, China
3. Department of Physics, Nanjing Normal University 3 , Nanjing 210097, China
4. Department of Electronics, School of Information Engineering, Nanchang University 4 , Nanchang 330031, China