About the Authors
- Petter Holme
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* E-mail: petter.holme@physics.umu.se
Affiliations Department of Physics, Umeå University, Umeå, Sweden, Department of Energy Science, Sungkyunkwan University, Suwon, Republic of Korea
Competing Interests
The author has declared that no competing interests exist.
Author Contributions
Conceived and designed the experiments: PH. Performed the experiments: PH. Analyzed the data: PH. Contributed reagents/materials/analysis tools: PH. Wrote the paper: PH.