1. School of MicroelectronicsUniversity of Science and Technology of China Hefei Anhui 230026 China
2. Physical Sciences and Engineering DivisionKing Abdullah University of Science and Technology (KAUST) Thuwal 23955 Saudi Arabia
3. Computer, Electrical, and Mathematical Sciences and Engineering DivisionKing Abdullah University of Science and Technology (KAUST) Thuwal 23955‐6900 Saudi Arabia
4. Wuhan National Laboratory for OptoelectronicsHuazhong University of Science and Technology Wuhan 430074 China
5. Ningbo Institute of Materials Technology and EngineeringChinese Academy of Sciences Ningbo Zhejiang 315201 China
6. School of Electronics and Information EngineeringHebei University of Technology Tianjin 300401 China