Exploring the charge dynamics in graphite nanoplatelets by THz and infrared spectroscopy

Hsiang Lin Liu, G. L. Carr, K. A. Worsley, M. E. Itkis, R. C. Haddon, A. N. Caruso, L. C. Tung, Y. J. Wang

Research output: Contribution to journalArticle

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Abstract

We present the results of THz, infrared and magneto-optical measurements performed on graphite nanoplatelet films as a function of temperature (4.2-300 K) and magnetic field (0-17.5 T). An effective medium analysis of the low-energy spectral response indicates that the nanoplatelet material is well described by a Drude function plus two infrared absorption bands. Interestingly, the Drude plasma frequency (∼1675 cm-1) decreases slowly with temperature, whereas the carrier scattering rate (∼175 cm-1) is temperature independent. Furthermore, measurements in an applied magnetic field at 4.2K show that a large portion of the Drude spectral weight is transferred to finite frequency features corresponding to various Landau-level transitions. Some of these transition energies scale as p B, as expected for Dirac-like quasi-particles in graphene and observed in other graphene-like materials. Thus, our results are consistent with recent theoretical calculations indicating that the spectrum of multilayer graphene can be decomposed into subsystems effectively identical to monolayer or bilayer graphene.

Original languageEnglish
Article number113012
JournalNew Journal of Physics
Volume12
DOIs
Publication statusPublished - 2010 Nov 1

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graphene
graphite
infrared spectroscopy
spectroscopy
plasma frequencies
elementary excitations
spectral sensitivity
optical measurement
magnetic fields
infrared absorption
temperature
absorption spectra
energy
scattering

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Liu, H. L., Carr, G. L., Worsley, K. A., Itkis, M. E., Haddon, R. C., Caruso, A. N., ... Wang, Y. J. (2010). Exploring the charge dynamics in graphite nanoplatelets by THz and infrared spectroscopy. New Journal of Physics, 12, [113012]. https://doi.org/10.1088/1367-2630/12/11/113012

Exploring the charge dynamics in graphite nanoplatelets by THz and infrared spectroscopy. / Liu, Hsiang Lin; Carr, G. L.; Worsley, K. A.; Itkis, M. E.; Haddon, R. C.; Caruso, A. N.; Tung, L. C.; Wang, Y. J.

In: New Journal of Physics, Vol. 12, 113012, 01.11.2010.

Research output: Contribution to journalArticle

Liu, HL, Carr, GL, Worsley, KA, Itkis, ME, Haddon, RC, Caruso, AN, Tung, LC & Wang, YJ 2010, 'Exploring the charge dynamics in graphite nanoplatelets by THz and infrared spectroscopy', New Journal of Physics, vol. 12, 113012. https://doi.org/10.1088/1367-2630/12/11/113012
Liu, Hsiang Lin ; Carr, G. L. ; Worsley, K. A. ; Itkis, M. E. ; Haddon, R. C. ; Caruso, A. N. ; Tung, L. C. ; Wang, Y. J. / Exploring the charge dynamics in graphite nanoplatelets by THz and infrared spectroscopy. In: New Journal of Physics. 2010 ; Vol. 12.
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