About the Authors

Lei Tan

Affiliations Department of Physics, Zhejiang University, Hangzhou 310027, China, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China

Bo Zheng

zhengbo@zju.edu.cn

Affiliations Department of Physics, Zhejiang University, Hangzhou 310027, China, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China

Jun-Jie Chen

Affiliations Department of Physics, Zhejiang University, Hangzhou 310027, China, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China

Xiong-Fei Jiang

Affiliation Department of Physics, Zhejiang University, Hangzhou 310027, China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: LT BZ JJC XFJ. Performed the experiments: LT JJC. Analyzed the data: LT BZ JJC. Contributed reagents/materials/analysis tools: LT XFJ. Wrote the paper: LT JJC BZ.