1. Jiangxi Key Laboratory of Nanomaterials and Sensors, School of Physics, Communication and Electronics, Jiangxi Normal University, 99 Ziyang Avenue, Nanchang 330022, Jiangxi, China
2. Hunan Key Laboratory for Super-micro Structure and Ultrafast Process, School of Physics and Electronics, Central South University, 932 South Lushan Road, Changsha 410083, Hunan, China
3. School of Electrical, Electronic and Computer Engineering, University of Western Australia, 35 Stirling Highway, Crawley 6009, Australia