1. Anhui Province Key Laboratory of Optoelectric Materials Science and Technology, School of Physics and Electronic Information, Anhui Normal University 1 , Wuhu 241002, China
2. Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, School of Physics and Telecommunication Engineering, South China Normal University 2 , Guangzhou 510006, China
3. Department of Applied Physics, Hong Kong Polytechnic University 3 , Hung Hom, Hong Kong