We thank for the funding support from the National Natural Science Foundation of China (No. 81973670 ), the Natural Science Foundation of Hunan Province (No. 2018JJ2297 ), the Key Program of Scientific Research Fund of Hunan Provincial Education Department (No. 19A370 ) and the Project of Research Learning and Innovative Experiment for College Students in Hunan (No. 2016284 , No. 2016281 , No. 2017281 and No. 2018420 ).