This work was financially supported by the National Nature Science Foundation of China (Nos. 21571189 and 21771062), Science and Technology Major Project of Hunan Province, China (2017GK1040), Science and Technology Plan Project of Hunan Province, China (Nos. 2016TP1007 and 2017TP1001), Hunan Provincial Natural Science Foundation of China (No. 2018JJ4002) and Innovation-Driven Project of Central South University (No. 2016CXS009).