1. School of Physics and Electronics, Henan University, Kaifeng 475004, People's Republic of China
2. School of Physical Science and Technology, Soochow University, Suzhou 215006, People's Republic of China
3. The Key Laboratory for Special Functional Materials of MOE, Henan University, Kaifeng 475004, People's Republic of China
4. Department of Mathematics and Physics, Nanjing Institute of technology, Jiangsu, Nanjing 211167, People's Republic of China