1. College of Physics, Sichuan University, 29 Wangjiang Road, Chengdu 610064, China
2. CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, 55 Zhongguancun East Street, Beijing 100190, China
3. School of Physical Sciences, University of Chinese Academy of Sciences, 19(A) Yuquan Road, Beijing 100049, China