1. State Key Laboratory of Metastable
Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China
2. School of
Physics and MOE Key
Laboratory of Weak-Light Nonlinear Photonics, Nankai University, Tianjin 300071, China
3. State Key Laboratory of Superhard
Materials, Jilin University, Changchun
130012, China