First of all, I would like to thank

First of all, I would like to thank my thesis instructor, Mr. Chen from the school of physics and electronic science, Guizhou Normal University. Mr. Chen made instructive suggestions and recommendations on the research direction of my thesis. During the process of writing the thesis, he gave careful guidance to the difficulties and doubts I met in time, put forward many useful improvement suggestions, and put in a lot of effort and energy. The teacher expressed sincere thanks for my help and care! At the same time, I also want to thank the teachers and all the students of the school of physics and electronic science of Guizhou Normal University, who have spent a perfect and unforgettable time together to learn from each other and help each other.