1. National Laboratory of Solid State Microstructures, School of Physics, College of Engineering and Applied Sciences, Jiangsu Key Laboratory of Artificial Functional Materials and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210023, China
2. Key Laboratory of Photovoltaic and Energy Conservation Materials, Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China
3. The Sixth Element (Changzhou) Materials Technology Co., Ltd. and Jiangsu Jiangnan Xiyuan Graphene Technology Co., Ltd., Changzhou 213161, China