1. SEU-FEI Nano-Pico Center
2. Key Laboratory of MEMS of Ministry of Education
3. School of Electrical Science and Engineering
4. Southeast University
5. 210096 Nanjing
6. Laboratory of Condensed Matter Spectroscopy and Opto-Electronic Physics
7. Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education)
8. Department of Physics and Astronomy
9. Shanghai Jiao Tong University
10. Shanghai
11. National Laboratory of Solid State Microstructures
12. College of Engineering and Applied Sciences
13. Nanjing University
14. 210093 Nanjing
15. China