1. Institute of Biomedicine and Biotechnology; Shenzhen Institutes of Advanced Technology; Chinese Academy of Sciences; Shenzhen 518055 P. R. China
2. SZU-NUS Collaborative Innovation Center for Optoelectronic Science and Technology, and Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province; College of Optoelectronic Engineering; Shenzhen University; Shenzhen 518060 P. R. China
3. Department of Physics and Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education; Wuhan University; Wuhan 430072 P. R. China
4. Department of Physics; The University of Hong Kong; 999077 Hong Kong P. R. China
5. Department of Physics and Materials Science; City University of Hong Kong; 999077 Hong Kong P. R. China