1. Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences Beijing 100190 China
2. School of Physical Sciences and CAS Key Laboratory of Vacuum Physics University of Chinese Academy of Sciences Beijing 100190 China
3. Songshan Lake Materials Laboratory Dongguan Guangdong 523808 China
4. CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing 100190 China
5. National Center for Nanoscience and Technology Chinese Academy of Sciences Beijing 100190 China