About the Authors

Wei Zhang

wzhangph@gmail.com (WZ); phchenwei@fudan.edu.cn (WC)

Affiliations State Key Laboratory of Surface Physics, Department of Physicse, Fudan University, Shanghai, China, Department of Applied Physics, Northwestern Polytechnical University, Xi'an, China, Department of Physics, Jinan University, Guangzhou, China

Song Chen

Affiliation State Key Laboratory of Surface Physics, Department of Physicse, Fudan University, Shanghai, China

Na Li

Affiliation State Key Laboratory of Surface Physics, Department of Physicse, Fudan University, Shanghai, China

Jia zheng Zhang

Affiliation State Key Laboratory of Surface Physics, Department of Physicse, Fudan University, Shanghai, China

Wei Chen

wzhangph@gmail.com (WZ); phchenwei@fudan.edu.cn (WC)

Affiliations State Key Laboratory of Surface Physics, Department of Physicse, Fudan University, Shanghai, China, Kavli Institute for Theoretical Physics China, CAS, Beijing, China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: WZ WC. Performed the experiments: WZ SC NL JZ. Analyzed the data: WZ WC. Contributed reagents/materials/analysis tools: WZ SC NL JZ WC. Wrote the paper: WZ WC.