Broadband microwave and time-domain terahertz spectroscopy of CVD grown graphene

Details Broadband microwave and time-domain terahertz spectroscopy of CVD grown graphene Broadband microwave and time-domain terahertz spectroscopy of CVD grown graphene

2011-06-13

arxiv.org/abs/1106.2472v2

J. Appl. Phys. 110, 083510 (2011)

Physics

Condensed Matter

Materials Science

10 pages, 4 figures

Scientific paper

We report a study of the complex AC impedance of CVD grown graphene. We measure the explicit frequency dependence of the complex impedance and conductance over the microwave and terahertz range of frequencies using our recently developed broadband microwave Corbino and time domain terahertz spectrometers (TDTS). We demonstrate how one may resolve a number of technical difficulties in measuring the intrinsic impedance of the graphene layer that this frequency range presents, such as distinguishing contributions to the impedance from the substrate. From our microwave measurements, the AC impedance has little dependance on temperature and frequency down to liquid helium temperatures. The small contribution to the imaginary impedance comes from either a remaining residual contribution from the substrate or a small deviation of the conductance from the Drude form.

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