About the Authors
- Liping Xiong
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Affiliation Department of Physics, George Washington University, Washington, D.C., United States of America
- Ganhui Lan
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* E-mail: glan@gwu.edu
Affiliation Department of Physics, George Washington University, Washington, D.C., United States of America
Competing Interests
The authors have declared that no competing interests exist.
Author Contributions
Conceived and designed the experiments: GL. Performed the experiments: LX GL. Analyzed the data: LX GL. Wrote the paper: GL.