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

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

研究成果: 雜誌貢獻期刊論文同行評審

7 引文 斯高帕斯(Scopus)

摘要

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.

原文英語
文章編號113012
期刊New Journal of Physics
12
DOIs
出版狀態已發佈 - 2010 十一月

ASJC Scopus subject areas

  • 物理與天文學 (全部)

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