1. National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences Beijing 100190 China
2. CAS Center for Excellence in Topological Quantum Computation and School of Physics University of Chinese Academy of Sciences Beijing 100049 China
3. Institute of Science and Technology Austria Am Campus 1 Klosterneuburg 3400 Austria
4. Frontier Institute of Science and Technology Xi'an Jiaotong University Xi'an 710054 China
5. Department of Physics University of Basel Klingelbergstrasse 82 Basel CH‐4056 Switzerland
6. Songshan Lake Materials Laboratory Dongguan Guangdong 523808 China
7. Institute of Microelectronics Chinese Academy of Sciences Beijing 100029 China
8. Department of Materials Science and Engineering University of Utah Salt Lake City UT 84112 USA