About the Authors

Maximilian Bauer

Affiliations Institute of Physics and Astronomy, Potsdam University, Potsdam-Golm, Germany, Physics Department, Technical University of Munich, Garching, Germany

Ralf Metzler

rmetzler@uni-potsdam.de

Affiliations Institute of Physics and Astronomy, Potsdam University, Potsdam-Golm, Germany, Physics Department, Tampere University of Technology, Tampere, Finland

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

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