[Hong, Qian-Qian; Shu, Chuan-Cun] Cent South Univ, Sch Phys & Elect, Hunan Key Lab Super Microstruct & Ultrafast Proc, Changsha 410083, Peoples R China.
[Guo, Yu] Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Hunan Prov Key Lab Flexible Elect Mat Genome Engn, Changsha 410114, Peoples R China.
[Guo, Yu] Hunan Normal Univ, Minist Educ, Key Lab Low Dimens Quantum Struct & Quantum Contr, Changsha 410081, Peoples R China.
[Henriksen, Niels E.] Tech Univ Denmark, Dept Chem, Bldg 207, DK-2800 Lyngby, Denmark.