About the Authors
Department of Physics, Faculty of Science and Engineering, Waseda University, Tokyo, Japan
Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, Connecticut, United States of America
Department of Physics, Faculty of Science and Technology, Chuo University, Tokyo, Japan
The authors have declared that no competing interests exist.
The author(s) have made the following declarations about their contributions: Conceived and designed the experiments: KS KK. Performed the experiments: KS HFC. Analyzed the data: KS. Contributed reagents/materials/analysis tools: KS DEH EM EMDLC KK. Wrote the paper: KS EMDLC KK.