1. State Key Laboratory of Artificial Microstructure and Mesoscopic Physics School of Physics Peking University Beijing 100871 P. R. China
2. Ioffe Institute Polytekhnicheskaya Str. 26 St. Petersburg 194021 Russia
3. Key Laboratory of Semiconductor Materials Science and Beijing Key Laboratory of Low‐dimensional Semiconductor Materials and Devices Institute of Semiconductors Chinese Academy of Sciences Beijing 100083 P. R. China
4. P. N. Lebedev Physical Institute Leninsky Ave. 53 Moscow 119991 Russia
5. MIREA Moscow Technological University Vernadsky Ave. 78 Moscow 119454 Russia
6. Department of Electrical and Electronic Engineering Mie University Mie 514‐8507 Japan
7. Advanced Micro‐Fabrication Equipment Inc. Shanghai 201201 P. R. China
8. Collaborative Innovation Center of Quantum Matter Beijing 100871 P. R. China