1. College of Materials Science and Opto-Electronic Technology & Center of Materials Science and Optoelectronics Engineering & CAS Center for Excellence in Topological Quantum Computation & CAS Key Laboratory of Vacuum Physic
2. University of Chinese Academy of Sciences
3. Beijing 100049
4. China
5. Department of Physics
6. Chemistry and Biology (IFM) Linköping University
7. Linköping 58183
8. Sweden
9. Key Laboratory of Nanosystem and Hierarchical Fabrication
10. National Center for Nanoscience and Technology
11. Beijing 100190