About the Authors

Ahmed E. Elbanna

elbanna2@uiuc.edu

Affiliations Department of Physics, University of California Santa Barbara, Santa Barbara, California, United States of America, Department of Civil and Environmental Engineering, University of Illinois at Urbana- Champaign, Urbana, Illinois, United States of America

Jean M. Carlson

Affiliation Department of Physics, University of California Santa Barbara, Santa Barbara, California, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: AE JC. Performed the experiments: AE. Analyzed the data: AE JC. Wrote the paper: AE.