**Author details**

Chang Liu, Lin Zhu, Lai-Guo Wang and Ai-Dong Li\* National Laboratory of Solid State Microstructures, Department of Materials Science and Engineering, College of Engineering and Applied Sciences, Jiangsu Key Laboratory of Artificial Functional Materials, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, People's Republic of China

\*Address all correspondence to: adli@nju.edu.cn

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