1. Jiangxi Key Laboratory of Nanomaterials and Sensors,
Jiangxi Key Laboratory of Photoelectronics and Telecommunication,
School of Physics, Communication and Electronics, Jiangxi Normal University, Nanchang 330022, Jiangxi, P.R. China
2. Department of Science Education, Jiangxi University of Technology, Nanchang 330098, Jiangxi, P.R. China
3. Key Laboratory of
Materials Physics, Centre for Environmental and Energy Nanomaterials,
Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute
of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, P.R. China
4. School of Physics
and Technology, Wuhan University, Wuhan 430072, P.R. China