Transport conductivity of graphene at RF and microwave frequencies (original) (raw)
We measure graphene coplanar waveguides from direct current (DC) to a frequency f=13.5 GHz and show that the apparent resistance (in the presence of parasitic impedances) has an 2 dependence (where f 2), but the intrinsic conductivity (without the influence of parasitic impedances) is frequency-independent. Consequently, in our devices the real part of the complex alternating current(AC) conductivity is the same as the DC value and the imaginary part is ∼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 ∼2.1 ps, highlighting the influence of AC electron transport on the electromagnetic properties of graphene. This can lead to optimized design of high-speed analog field-effect transistors, mixers, frequency doublers, low-noise amplifiers and radiation detectors.
Sign up for access to the world's latest research.
checkGet notified about relevant papers
checkSave papers to use in your research
checkJoin the discussion with peers
checkTrack your impact
Loading Preview
Sorry, preview is currently unavailable. You can download the paper by clicking the button above.