[Wang, Liu; Zhao, Wei-Wei; Zhai, Xiang; Liu, Zhong-He; Xiang, Dong; Li, Xiao-Fei; Wang, Ling-Ling] Hunan Univ, Sch Phys & Microelect, Changsha 410082, Hunan, Peoples R China.
[Wang, Liu; Zhao, Wei-Wei; Zhai, Xiang; Liu, Zhong-He; Xiang, Dong; Li, Xiao-Fei; Wang, Ling-Ling] Hunan Univ, Key Lab Micronano Phys & Technol Hunan Prov, Changsha 410082, Hunan, Peoples R China.
[Xiang, Dong] Univ S China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.