About the Authors

Dan M. Popescu

Affiliation Department of Physics, University of Richmond, Richmond, Virginia, United States of America

Ovidiu Lipan

olipan@richmond.edu

Affiliation Department of Physics, University of Richmond, Richmond, Virginia, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

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