1. School
of Materials Sciences and Engineering, University of Science and Technology Beijing, Beijing 100083, China
2. Department
of Chemistry, Northwestern University, Evanston, Illinois 60208-3113, United States
3. College
of Sciences, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
4. Laboratory
of Crystal Physics, Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk 660036, Russia
5. Department
of Physics, Far Eastern State Transport University, Khabarovsk, 680021, Russia