1. Department of Microelectronics
and Key Laboratory of Artificial Micro- and Nano-structures of Ministry
of Education, School of Physics and Technology, Wuhan University, Wuhan 430072, China
2. Wuhan National
High Magnetic Field Center and School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
3. Key Laboratory for Micro-/Nano-Optoelectronic
Devices of Ministry of Education, School of Physics and Electronics, Hunan University, Changsha 410082, China
4. Institute of Optoelectronic Display, Fuzhou University, Fuzhou 350002, China