[Luo, Xiao-Qing; Zhu, Weihua; Luo, XQ; Wang, XL; Ou, Jie; Luo, Youlin; Wang, Xinlin; Chen, Zhiyong; Yi, Jianji] Univ South China, Sch Elect Engn, Hunan Prov Key Lab Ultrafast Micro Nano Technol &, Hengyang 421001, Peoples R China.
[Wang, Xinlin] Univ South China, Sch Mech Engn, Hengyang 421001, Peoples R China.
[Luo, Xiao-Qing; Liu, W. M.] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China.
[Liu, W. M.] Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100190, Peoples R China.
[Liu, W. M.] Songshan Lake Mat Lab, Dongguan 523808, Guangdong, Peoples R China.