1. Key Laboratory of Artificial Micro‐ and Nano‐structures of Ministry of Education School of Physics and Technology Wuhan University Wuhan 430072 China
2. Key Laboratory of Multifunctional Nanomaterials and Smart Systems Suzhou Institute of Nano‐Tech and Nano‐Bionics CAS Suzhou Jiangsu 215123 China
3. The State Key Laboratory of Refractories and Metallurgy School of Materials and Metallurgy Wuhan University of Science and Technology Wuhan 430081 China
4. Faculty of Physics and Electronic Science Hubei University Wuhan 430062 China
5. Nanchang (SINANONC) Nano‐Devices and Technologies Division Suzhou Institute of Nano‐Tech and Nano‐Bionics Chinese Academy of Sciences Nanchang 330200 China