1. Institute of Physics and Center for Emergent Functional Matter Science, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan.
2. IBM Thomas J. Watson Research Centers, Yorktown Heights, NY 10598, USA.
3. Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwan.
4. International College of Semiconductor Technology, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan.
5. Kavli Institute for Theoretical Sciences and CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing 100190, China.
6. Zhejiang Institute of Modern Physics and Department of Physics, Zhejiang University, Hangzhou 310027, China.
7. Zhejiang Province Key Laboratory of Quantum Technology and Device, Zhejiang University, Hangzhou 310027, China.
8. Department of Electrophysics, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan.