Terahertz Dynamics of Quantum-Confined Electrons in Carbon Nanomaterials

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dc.citation.firstpage846
dc.citation.journalTitleJournal of Infrared, Millimeter, and Terahertz Wavesen_US
dc.citation.lastpage860
dc.citation.volumeNumber33en_US
dc.contributor.authorRen, Lei
dc.contributor.authorZhang, Qi
dc.contributor.authorNanot, Sébastien
dc.contributor.authorKawayama, Iwao
dc.contributor.authorTonouchi, Masayoshi
dc.contributor.authorKono, Junichiro
dc.date.accessioned2013-09-18T17:03:53Z
dc.date.available2013-09-18T17:03:53Z
dc.date.issued2012
dc.description.abstractLow-dimensional carbon nanostructures, such as single-wall carbon nanotubes (SWCNTs) and graphene, offer new opportunities for terahertz science and technology. Being zero-gap systems with a linear, photon-like energy dispersion, metallic SWCNTs and graphene exhibit a variety of extraordinary properties. Their DC and linear electrical properties have been extensively studied in the last decade, but their unusual finite-frequency, nonlinear, and/or non-equilibrium properties are largely unexplored, although they are predicted to be useful for new terahertz device applications. Terahertz dynamic conductivity measurements allow us to probe the dynamics of such photon-like electrons, or massless Dirac fermions. Here, we use terahertz time-domain spectroscopy and Fourier transform infrared spectroscopy to investigate terahertz conductivities of one-dimensional and two-dimensional electrons, respectively, in films of highly aligned SWCNTs and gated largearea graphene. In SWCNTs, we observe extremely anisotropic terahertz conductivities, promising for terahertz polarizer applications. In graphene, we demonstrate that terahertz and infrared properties sensitively change with the Fermi energy, which can be controlled by electrical gating and thermal annealing.en_US
dc.description.sponsorshipNational Science Foundation OISE-0530220en_US
dc.description.sponsorshipNational Science Foundation OISE-0968405en_US
dc.identifier.citationL. Ren, Q. Zhang, S. Nanot, I. Kawayama, M. Tonouchi and J. Kono, "Terahertz Dynamics of Quantum-Confined Electrons in Carbon Nanomaterials," <i>Journal of Infrared, Millimeter, and Terahertz Waves,</i> vol. 33, 2012.*
dc.identifier.doihttp://dx.doi.org/10.1007/s10762-012-9916-8en_US
dc.identifier.urihttps://hdl.handle.net/1911/72094
dc.language.isoengen
dc.publisherSpringeren_US
dc.subjectTerahertzen_US
dc.subjectNanotubeen_US
dc.subjectGrapheneen_US
dc.subjectAnisotropicen_US
dc.subjectPolarizationen_US
dc.titleTerahertz Dynamics of Quantum-Confined Electrons in Carbon Nanomaterialsen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten
dc.type.dcmiTexten_US
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