Transport conductivity of graphene at RF and microwave frequencies. (19th February 2016)

• Record Type: Journal Article
• Authors: Awan, S A; Lombardo, A; Colli, A; Privitera, G; Kulmala, T S; Kivioja, J M; Koshino, M; Ferrari, A C
• Is Part Of: 2D materials. Volume 3:Number 1(2016)
• Publication Date: 2016-02-19
• Subjects: graphene -- high frequency -- electronics; Graphene -- Periodicals; Materials science -- Periodicals; Nanostructured materials -- Periodicals; 620.115
• DOI: 10.1088/2053-1583/3/1/015010
• Languages: English
• ISSNs: 2053-1583

Abstract

Abstract: 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 dependence (where ), 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.