Transport conductivity of graphene at RF and microwave frequencies

S. A. Awan, A. Lombardo, A. Colli, G. Privitera, T. S. Kulmala, J. M. Kivioja, M. Koshino, A. C. Ferrari

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

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 ω2 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.

Original languageEnglish
Article number015010
Journal2D Materials
Volume3
Issue number1
DOIs
Publication statusPublished - 2016 Feb 19

Keywords

  • Electronics
  • Graphene
  • High frequency

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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