1. Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics
2. Tsinghua University
3. Beijing
4. China
5. Center for Fusion Energy Science and Technology
6. Chinese Academy of Engineering Physics
7. School of Physics
8. Beihang University
9. Institut Charles Delaunay UMR CNRS 6279 – Université de technologie de Troyes
10. Laboratoire de Nanotechnologie et d’Instrumentation Optique
11. F-10004 TROYES Cedex
12. France