Decrease in Terahertz Conductivity of Graphene Under Electron Beam Irradiations

Authors

Xiaodong Feng, University of Electronic Science and Technology of China
Min Hu, University of Electronic Science and Technology of China
Zhuocheng Zhang, University of Electronic Science and Technology of China
Sen Gong, University of Electronic Science and Technology of China
Jun Zhou, University of Electronic Science and Technology of China
Renbin Zhong, University of Electronic Science and Technology of China
Diwei Liu, University of Electronic Science and Technology of China
Zhenhua Wu, University of Electronic Science and Technology of China
Tao Zhao, University of Electronic Science and Technology of China
C Zhang, University of WollongongFollow
Shenggang Liu, University of Electronic Science and Technology of China

RIS ID

133070

Publication Details

Feng, X., Hu, M., Zhang, Z., Gong, S., Zhou, J., Zhong, R., Liu, D., Wu, Z., Zhao, T., Zhang, C. & Liu, S. (2019). Decrease in Terahertz Conductivity of Graphene Under Electron Beam Irradiations. Journal of Infrared, Millimeter, and Terahertz Waves, 40 (3), 297-305.

Abstract

Electron beam (e-beam) irradiations are often involved for characterizing graphene-based terahertz (THz) devices or realizing graphene surface plasmons. Here, based on THz time-domain spectroscopy (TDS) and two-dimensional scanning system, the time dependence and the in situ mapping images of changed THz conductivity of graphene induced by e-beam irradiations are studied. The change in THz signals with irradiation indicates a decrease in the THz conductivity as a result of electron doping in graphene through irradiation. And the spatial imaging maps of the decreased THz conductivity reveal diverse electron doping speeds in graphene during different current e-beam irradiations. Additionally, different theoretical doping models are given for explanations of the imaging maps and the calculated results by doping models are in good accordance with the experimental results. Our findings are of significance for understanding the change in THz conductivity and carrier transport of graphene under e-beam irradiations.