L.Y. Xia and X. L. Li contributed equally to this work. The authors acknowledge the support of the National Natural Science Foundation of China (31530009, 31200438), National Key R&D Program of China (2017YFD0600804), Hunan Provincial Natural Science Foundation of China (2015JJ2199), Doctoral Program Foundation of Institutions of Higher Education of China (20124321120002), Hunan Provincial Innovation Foundation for Postgraduate (CX2017B402), and Scientic Innovation Fund for Graduate of Central South University of Forestry and Technology (CX2017B09). We thank the Photoemission Endstations (BL10B) in National Synchrotron Radiation Laboratory (NSRL) for the help in characterizations.