1. Key Lab for Advanced Materials Processing Technology of Education Ministry
2. State Key Lab of New Ceramic and Fine Processing
3. School of Materials Science and Engineering
4. Tsinghua University
5. Beijing 100084, China
6. Department of Physics
7. State Key Laboratory of Low-Dimensional Quantum Physics
8. Beijing, China
9. College of Materials Science and Engineering
10. Beijing University of Chemical Technology
11. School of Materials Science & Engineering
12. Beijing Institute of Technology
13. Beijing 100081, China
14. Department of Materials Science and NanoEngineering
15. Rice University
16. Houston, USA