About the Authors

Elham Najafi

e.najafi@znu.ac.ir

Affiliation Department of Physics, University of Zanjan, Zanjan, Iran

Amir H. Darooneh

Affiliation Department of Physics, University of Zanjan, Zanjan, Iran

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

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