[Li, Zhenye; Ding, Xu] Univ South China, Coll Mech Engn, Hengyang 421001, Peoples R China.
[Yin, H; Yin, Hang; Jiang, Dongcheng] Shandong Univ, Sch Phys, State Key Lab Crystal Mat, Jinan 250100, Peoples R China.
[Ding, YF; Ding, Yu-Feng] Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.
[Liu, Biao] Cent South Univ, Sch Phys & Elect, Changsha 410083, Peoples R China.
[Zhao, Yu-Qing] Hunan Univ Sci & Technol, Sch Phys & Elect Sci, Xiangtan 411201, Peoples R China.