1. State Key Laboratory of Superlattices and MicrostructuresInstitute of SemiconductorsChinese Academy of Sciences Beijing 100083 China
2. College of Materials Science and Opto‐Electronic TechnologyUniversity of Chinese Academy of Science Beijing 100049 China
3. Division of Electrical, Electronic and Information Engineering Graduate School of EngineeringOsaka University Osaka 565‐0871 Japan
4. School of Physics and AstronomyUniversity of Nottingham Nottingham NG7 2RD UK
5. Institute for Problems of Materials ScienceThe National Academy of Sciences of UkraineChernivtsi Branch Chernivtsi 58001 Ukraine
6. Beijing Academy of Quantum Information Sciences Beijing 100193 China