We measure graphene coplanar waveguides from direct current (DC) to f =13.5GHz and show that the apparent resistance (in the presence of parasitic impedances) has an ω 2 dependence (where ω = 2πf ), but the intrinsic conductivity (without the influence of parasitic impedances) is frequencyindependent. Consequently, in our devices the real part of the complex alternating current conductivity is the same as the DC value and the imaginary part∼ 0. The graphene channel is modeled as a parallel resistive-capacitive network with a frequency dependence identical to that of the Drude conductivity with momentum relaxation time∼ 2.1ps, highlighting the influence of alternating current (AC) electron transport on the electromagnetic properties of graphene. This can lead to optimized design of high-speed analogue field-effect transistors, mixers, frequency doublers, low-noise amplifiers and radiation detectors.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.