1. Key Laboratory of Quantum Information, University of Science and Technology of China 1 , Hefei, Anhui 230026, China
2. Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University 2 , 199 Ren’ai Road, Suzhou 215123, Jiangsu, People’s Republic of China
3. Institute of Physics, Chinese Academy of Sciences 3 , Beijing 100190, China
4. Songshan Lake Materials Laboratory 4 , Dongguan 523808, Guangdong, China