1. Hunan Key Laboratory of Two‐Dimensional Materials Key Laboratory for Micro/Nano‐Optoelectronic Devices Ministry of Education Department of Applied Physics School of Physics and Electronics Hunan University Changsha 410082 China
2. Hunan Key Laboratory of Two‐Dimensional Materials and State Key Laboratory for Chemo/Biosensing and Chemometrics College of Chemistry and Chemical Engineering Hunan University Changsha 410082 China
3. State Key Laboratory of Superlattices and Microstructures Institute of Semiconductors Chinese Academy of Sciences Beijing 100083 China
4. Department of Applied Physics School of Physics and Electronics Hunan University Changsha 410082 China