The authors acknowledge the financial support from the National Natural Science Foundation of China (No. 21601020 , 51604042 ), Hunan Provincial Natural Science Foundation of China (No. 2016JJ3003 , 2017JJ3324 ), Hunan provincial key research and development plan (Grant No. 2016GK2012 ), Scientific Research Fund of Hunan Provincial Education Department (No. 17B002 ), Changsha City Fund for Distinguished and Innovative Young Scholars (No. KQ1707014 ).
The authors acknowledge the financial support from the National Natural Science Foundation of China (No. 21601020, 51604042), Hunan Provincial Natural Science Foundation of China (No. 2016JJ3003, 2017JJ3324), Hunan provincial key research and development plan (Grant No. 2016GK2012), Scientific Research Fund of Hunan Provincial Education Department (No. 17B002), Changsha City Fund for Distinguished and Innovative Young Scholars (No. KQ1707014).