1. College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China
2. Institute of Modern Physics, Chinese Academy of Science, Lanzhou 730000, China
3. Advanced Energy Science and Technology Guangdong Laboratory, Huizhou 516000, China
4. College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518061, China
5. School of Nuclear Science and Technology, University of Chinese Academy of Science, Beijing 100043, China
6. School of Information Science and Engineering, Lanzhou University, Lanzhou 730000, China
7. Center for Basic Teaching and Experiment, Nanjing University of Science and Technology, Jiangyin 214443, China 9, China