1. Department of Physics, Zhejiang Normal University, Jinhua 321004, China
2. Zhejiang Institute of Photoelectronics & Zhejiang Institute for Advanced Light Source, Zhejiang Normal University, Jinhua 321004, China
3. School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
4. Department of Physics, Xingtai University, Xingtai 054001, China
5. College of Physics, Hebei Normal University, Shijiazhuang 050024, China