[Luo, Xiao-Qing; Chen, Zhi-Yong; Luo, XQ; Wang, Xin-Lin; Ou, Jie; Luo, You-Lin; Zhu, Wei-Hua] Univ South China, Sch Elect Engn, Hunan Prov Key Lab Ultrafast Micro Nano Technol &, Hengyang 421001, Peoples R China.
[Luo, Xiao-Qing; Liu, Wu-Ming] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China.
[Wang, Xin-Lin; Liu, Wu-Ming] Univ South China, Sch Mech Engn, Hengyang 421001, Peoples R China.
[Liu, Wu-Ming] Songshan Lake Mat Lab, Dongguan 523808, Guangdong, Peoples R China.