1. CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro‐Nano Energy and Sensor Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences Beijing 101400 P. R. China
2. School of Nanoscience and Technology University of Chinese Academy of Sciences Beijing 100049 P. R. China
3. Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China
4. State Key Laboratory for Mesoscopic Physics Frontiers Science Center for Nano‐optoelectronics School of Physics Peking University Beijing 100871 China
5. Center of Nanoenergy Research School of Physical Science and Technology Guangxi University Nanning 530004 P. R. China