[Tan, Wenjun; Wang, Shitan; Li, Lin; Gao, Yongli; Xie, Haipeng; Wang, Can; Niu, Dongmei; Huang, Han; Niu, DM; Gao, YL; Zhao, Yuan] Cent S Univ, Sch Phys & Elect, Hunan Key Lab Super Microstruct & Ultrafast Proc, Changsha 410012, Hunan, Peoples R China.
[Deng, Yunlai; Wang, Can] Cent S Univ, Light Alloy Res Inst, Changsha 410083, Hunan, Peoples R China.
[Li, Lin] Cent South Univ Forestry & Technol, Sch Elect & Informat Engn, Changsha 410004, Hunan, Peoples R China.
[Deng, Yunlai] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China.
[Gao, Yongli] Univ Rochester, Dept Phys & Astron, Rochester, NY 14627 USA.