1. CAS Key Laboratory of Nanophotonic Materials and Devices and Key Laboratory of Nanodevices and Applications, i-Lab, Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO), Chinese Academy of Sciences, Suzhou 215123, People's Republic of China
2. School of Nano Technology and Nano Bionics, University of Science and Technology of China, Hefei 230026, People's Republic of China
3. Songshan Lake Materials Laboratory, Guangdong 523000, People's Republic of China
4. Institute of Physics, Chinese Academy of Science, Beijing 100190, People's Republic of China
5. Shenzhen Exciton Science and Technology Ltd., Shenzhen 518052, People's Republic of China