1. State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, People's Republic of China
2. School of Science, Changchun University of Science and Technology, Changchun 130022, People's Republic of China
3. Shandong Key Laboratory of Optical Communication Science and Technology, School of Physical Science & Information Technology of Liaocheng University, Liaocheng 252059, People's Republic of China