1. State Key Laboratory of Artificial Microstructure and Mesoscopic Physics Nano‐optoelectronics Frontier Center of Ministry of Education School of Physics Peking University Beijing 100871 P. R. China
2. Peking University Yangtze Delta Institute of Optoelectronics Nantong Jiangsu 226010 P. R. China
3. School of Integrated Circuits Peking University Beijing 100871 P. R. China
4. Collaborative Innovation Center of Quantum Matter Beijing 100871 P. R. China