About the Authors

Wenbing Li

wenbinglee@gmail.com

Affiliation Department of Chemistry and Biology, Jackson State University, Jackson, Mississippi, United States of America

Tingying Zeng

Affiliation The Center for Excitonics, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: WL TZ. Performed the experiments: WL. Analyzed the data: WL TZ. Contributed reagents/materials/analysis tools: WL TZ. Wrote the paper: WL TZ.