1. School of Physics and Optoelectronic Engineering; Guangdong University of Technology; WaiHuan Xi Road No. 100 Guangzhou 510006 China
2. Department of Physics; Xinjiang University; Urumqi 830046 China
3. Research and Development Center for Function Crystals; Beijing National Laboratory for Condensed Matter Physics; Chinese Academy of Sciences; P. O. Box 603 Beijing 100190 China
4. Academy of Fundamental and Interdisciplinary Sciences; Harbin Institute of Technology; Harbin 150080 China