This work was supported by the National Natural Science Foundation of China (No. 81441065, No. 31970177); Natural Science Foundation of Hunan Province, China (Grant No. 2019JJ40253); Key Fund Project of Hunan Provincial Department of Education (Grant No. 18A234); and Scientific Research Foundation for the Returned Overseas Chinese Scholars, University of South China (Grant No. 2017XQD25).