About the Authors

Shin-ichi Todoroki


Affiliation Advanced Materials Laboratory, National Institute for Materials Science, Tsukuba, Ibaraki, Japan

Competing Interests

The author has declared that no competing interests exist.

Author Contributions

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