About the Authors

Stephan Köhler

Affiliations Institut für Physik, Johannes Gutenberg–Universität Mainz, Mainz, Germany, Graduate School Materials Science in Mainz, Mainz, Germany

Friederike Schmid

Affiliation Institut für Physik, Johannes Gutenberg–Universität Mainz, Mainz, Germany

Giovanni Settanni

settanni@uni-mainz.de

Affiliations Institut für Physik, Johannes Gutenberg–Universität Mainz, Mainz, Germany, Max Planck Graduate Center mit der Johannes Gutenberg-Universität Mainz, Mainz, Germany

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

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