1. School of Physical Science and Technology, ShanghaiTech University , Shanghai 201210, China
2. Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices, Renmin University of China , Beijing 100872, China
3. ShanghaiTech Laboratory for Topological Physics, ShanghaiTech University , Shanghai 201210, China
4. Center for High Pressure Science and Technology Advanced Research , Shanghai 201203, China
5. Shanghai Key Laboratory of High-resolution Electron Microscopy, ShanghaiTech University , Shanghai 201210, China