1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China.
3 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
4 School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
5 School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China. Electronic address: ronggui@hust.edu.cn.
6 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China. Electronic address: hzhao@iphy.ac.cn.