1. Hunan Provincial Key Laboratory of Two‐Dimensional Materials State Key Laboratory for Chemo/Biosensing and Chemometrics College of Chemistry and Chemical Engineering Hunan University Changsha 410082 P. R. China
2. School of Materials Science and Engineering Central South University Changsha Hunan 410083 P. R. China
3. Key Laboratory for Micro‐Nano Physics and Technology of Hunan Province College of Materials Science and Engineering Hunan University Changsha 410082 P. R. China
4. Hunan Key Laboratory of Two‐Dimensional Materials Department of Applied Physics School of Physics and Electronics Hunan University Changsha 410082 P. R. China
5. School of Physics and Key Laboratory of MEMS of Ministry of Education Southeast University Nanjing 211189 P. R. China