CUED Publications database

Transport conductivity of graphene at RF and microwave frequencies

Awan, SA and Lombardo, A and Colli, A and Privitera, G and Kulmala, TS and Kivioja, JM and Koshino, M and Ferrari, AC (2016) Transport conductivity of graphene at RF and microwave frequencies. 2D Materials, 3.

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Abstract

© 2016 IOP Publishing Ltd. Wemeasure 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 ω 2 dependence (where ω = 2πf), 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 ACelectron 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.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div B > Solid State Electronics and Nanoscale Science
Div B > Photonics
Depositing User: Unnamed user with email sms67@cam.ac.uk
Date Deposited: 17 Jul 2017 18:58
Last Modified: 21 Nov 2017 02:10
DOI: