[Tang, Yiwen; Ma, Wenhao; Qu, Gan; Yang, Wanjun] Cent China Normal Univ, Inst Nanosci & Technol, Dept Phys & Technol, Wuhan 430079, Hubei, Peoples R China.
[Zheng, He; Zhao, Lulu; Jia, Shuangfeng; Wang, Jianbo; Qu, Gan; Li, Lei] Wuhan Univ, Sch Phys & Technol, Ctr Electron Microscopy, MOE Key Lab Artificial Micro & Nanostruct,Inst Ad, Wuhan 430072, Hubei, Peoples R China.
[Wang, Hai] China Univ Geosci, Sch Math & Phys, Wuhan 430074, Hubei, Peoples R China.