About the Authors

Jaroslav Albert

jalbert@ulb.ac.be

Affiliation Applied Physics Research Group, Vrije Universiteit Brussel, Brussels, Belgium

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

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