1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
2 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. jteng@iphy.ac.cn.
4 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China. jteng@iphy.ac.cn.
5 Beijing Key Laboratory for Nanomaterials and Nanodevices, Beijing, 100190, China. jteng@iphy.ac.cn.
6 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China. yqli@iphy.ac.cn.
7 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China. yqli@iphy.ac.cn.
8 Beijing Key Laboratory for Nanomaterials and Nanodevices, Beijing, 100190, China. yqli@iphy.ac.cn.