Determination of minimum conductivity of graphene from contactless microwaves measurements

Pankaj Sharma, Juan Sebastian Gomez Diaz, Adrian M. Ionescu, J. Perruisseau-Carrier

Research output: Chapter in Book/Report/Conference proceedingConference contribution

8 Scopus citations

Abstract

We report a non-direct method to determine the minimum conductivity (σmin) of graphene. The proposed technique is based on the prior characterization of graphene sheet impedance at microwave frequencies using waveguides, and on the subsequent extraction of σmin from the measured scattering rate. This approach presents some advantages as compared with standard DC characterization methods, as it is inherently contactless and does not require graphene patterning. Our experimental study estimates a σmin in the range of 2e2/h-4e 2/h for different samples. We also compute the density of charged impurities of our samples, and show that they are related to graphene conductivity at its Dirac point.

Original languageEnglish (US)
Title of host publication2012 12th IEEE International Conference on Nanotechnology, NANO 2012
DOIs
StatePublished - Nov 22 2012
Externally publishedYes
Event2012 12th IEEE International Conference on Nanotechnology, NANO 2012 - Birmingham, United Kingdom
Duration: Aug 20 2012Aug 23 2012

Other

Other2012 12th IEEE International Conference on Nanotechnology, NANO 2012
CountryUnited Kingdom
CityBirmingham
Period8/20/128/23/12

Keywords

  • Graphene
  • Microwave
  • Millimeter wave
  • Minimum Conductivity
  • Relaxation time

ASJC Scopus subject areas

  • Bioengineering
  • Electrical and Electronic Engineering
  • Materials Chemistry
  • Condensed Matter Physics

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  • Cite this

    Sharma, P., Gomez Diaz, J. S., Ionescu, A. M., & Perruisseau-Carrier, J. (2012). Determination of minimum conductivity of graphene from contactless microwaves measurements. In 2012 12th IEEE International Conference on Nanotechnology, NANO 2012 [6322060] https://doi.org/10.1109/NANO.2012.6322060