About the Authors

Segun Goh

Affiliation Department of Physics and Astronomy and Center for Theoretical Physics, Seoul National University, Seoul, Korea

Keumsook Lee

kslee@sungshin.ac.kr (KL); mychoi@snu.ac.kr (MYC)

Affiliation Department of Geography, Sungshin Women's University, Seoul, Korea

MooYoung Choi

kslee@sungshin.ac.kr (KL); mychoi@snu.ac.kr (MYC)

Affiliation Department of Physics and Astronomy and Center for Theoretical Physics, Seoul National University, Seoul, Korea

Jean-Yves Fortin

Affiliation CNRS, Institut Jean Lamour, Département de Physique de la Matière et des Matériaux, UMR 7198, Vandoeuvre-les-Nancy, France

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: KL MYC. Performed the experiments: SG KL. Analyzed the data: SG. Contributed reagents/materials/analysis tools: JYF. Wrote the paper: SG MYC JYF.