About the Authors

Hui Zhang

Affiliation Institute of Theoretical Physics, Lanzhou University, Lanzhou, China

Yueling Chen

Affiliations Institute of Theoretical Physics, Lanzhou University, Lanzhou, China, Department of Physics, Gansu College of Traditional Chinese Medicine, Lanzhou, China

Yong Chen

ychen@lzu.edu.cn

Affiliations Institute of Theoretical Physics, Lanzhou University, Lanzhou, China, Department of Mathematics, Kings College London, London, United Kingdom

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: YC HZ. Performed the experiments: HZ YC. Analyzed the data: YC HZ YLC. Contributed reagents/materials/analysis tools: YC HZ. Wrote the paper: HZ YC.