About the Authors
- Tae-goo Kwon
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Affiliation Department of Physics, Korea University, Seoul 136-713, Korea
- Taeseok Daniel Yang
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Affiliation Department of Physics, Korea University, Seoul 136-713, Korea
- Kyoung J. Lee
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* E-mail: kyoung@korea.ac.kr
Affiliation Department of Physics, Korea University, Seoul 136-713, Korea
Competing Interests
The authors have declared that no competing interests exist.
Author Contributions
Conceived and designed the experiments: KL. Performed the experiments: TK. Analyzed the data: TK TY KL. Wrote the paper: KL.