1. College of Physics and Electronic Engineering, Nanyang Normal University, Nanyang 473061, China
2. International Laboratory for Quantum Functional Materials of Henan, School of Physics and Engineering, Zhengzhou University, Zhengzhou 450001, China
3. Henan Provincial Key-Laboratory of Nano-composite and Applications, School of Information Engineering, Huanghe Science and Technology College, Zhengzhou 450006, China
4. Key Laboratory for Special Functional Materials of Ministry of Education, School of Physics and Electronics, Henan University, Kaifeng 475004, China