Affiliation: | (Department of Physics,Xinxiang University,Xinxiang 453003,China;Institute of Technology and Science,Tokushima University,Tokushima 770-8506,Japan;School of Electronics and Information Technology,Sun Yat-Sen University,Guangzhou 510275,China;State Key Laboratory of Superhard Material,Jilin University,Changchun 130012,China) |