1. Key Laboratory of Semiconductor Materials ScienceBeijing Key Laboratory of Low Dimensional Semiconductor Materials and DevicesInstitute of SemiconductorsChinese Academy of Sciences Beijing 100083 China
2. College of Materials Science and Opto‐Electronic TechnologyUniversity of Chinese Academy of Sciences Beijing 100049 China
3. Research Center of Ultra‐Precision Optoelectronic InstrumentHarbin Institute of Technology Harbin 150080 China
4. Department of Electronic EngineeringEast China Normal University 500 Dongchuan Road Shanghai 200241 China
5. Department of PhysicsHarbin Institute of Technology Harbin 150080 China
6. Suzhou Institute of Nano‐Tech and Nano‐BionicsChinese Academy of Sciences Suzhou 215125 China