1. State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics , Sun Yat-sen University , Guangzhou 510275 , China
2. Key Laboratory of Optoelectronic Technology and Systems, Ministry of Education, School of Optoelectronic Engineering , Chongqing University , Chongqing 400044 , China
3. State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics , Peking University , 100871 , Beijing , China
4. Department of Electronic Engineering, College of Information Science and Technology , Jinan University , Guangzhou 510630 , China
5. Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices, School of Information and Optoelectronic Science and Engineering , South China Normal University , Guangzhou 510006 , China