1. School of physics and Electrical Information Engineering
2. Daqing Normal University
3. Daqing
4. China
5. Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems
6. School of Materials Science & Engineering
7. Beijing Institute of Technology
8. Beijing 100081
9. Department of Physics of Complex Systems
10. Weizmann Institute of Science
11. Rehovot 76100
12. Israel