About the Authors

Yong Wang

Affiliation Department of Physics and Astronomy, University of California Los Angeles, Los Angeles, California, United States of America

Giovanni Zocchi

zocchi@physics.ucla.edu

Affiliation Department of Physics and Astronomy, University of California Los Angeles, Los Angeles, California, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: YW GZ. Performed the experiments: YW. Analyzed the data: YW. Wrote the paper: YW GZ.