State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China;
State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China;
Department of Physics, College of Science, Yanbian University, Yanji 133002, China;
State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China;
State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China;
Department of Physics, College of Science, Yanbian University, Yanji 133002, China;
State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China;