1. University of Michigan – Shanghai Jiao Tong University Joint Institute Shanghai Jiao Tong University Shanghai 200240 China
2. Aerospace Laser Technology and System Department Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 China
3. School of Micro‐Nano Electronics Zhejiang University Hangzhou 310027 China
4. State Key Laboratory for Superlattices and Microstructures Institute of Semiconductors Chinese Academy of Sciences Beijing 100083 China