1. School of Physical Sciences, University of Chinese Academy of Sciences, Beijing100049, People’s Republic of China
2. Department of Materials Science and Engineering, National University of Singapore, 117575Singapore, Singapore
3. Institute of Physics & University of Chinese Academy of Sciences, Chinese Academy of Science, Beijing100190, People’s Republic of China
4. CAS Centre for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing100049, People’s Republic of China