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dc.contributor.authorSanders, G.D.
Nugraha, A.R.T.
Sato, K.
Kim, J.-H.
Kono, J.
Saito, R.
Stanton, C.J.
dc.date.accessioned 2013-03-20T20:11:09Z
dc.date.available 2014-03-21T05:10:10Z
dc.date.issued 2013
dc.identifier.citation Sanders, G.D., Nugraha, A.R.T., Sato, K., et al.. "Theory of coherent phonons in carbon nanotubes and graphene nanoribbons." Journal of Physics: Condensed Matter, 25, (2013) IOP Publishing: 144201. http://dx.doi.org/10.1088/0953-8984/25/14/144201.
dc.identifier.urihttps://hdl.handle.net/1911/70799
dc.description.abstract We survey our recent theoretical studies on the generation and detection of coherent radial breathing mode (RBM) phonons in single-walled carbon nanotubes and coherent radial breathing like mode (RBLM) phonons in graphene nanoribbons. We present a microscopic theory for the electronic states, phonon modes, optical matrix elements and electronヨphonon interaction matrix elements that allows us to calculate the coherent phonon spectrum. An extended tight-binding (ETB) model has been used for the electronic structure and a valence force field (VFF) model has been used for the phonon modes. The coherent phonon amplitudes satisfy a driven oscillator equation with the driving term depending on the photoexcited carrier density. We discuss the dependence of the coherent phonon spectrum on the nanotube chirality and type, and also on the graphene nanoribbon mod number and class (armchair versus zigzag). We compare these results with a simpler effective mass theory where reasonable agreement with the main features of the coherent phonon spectrum is found. In particular, the effective mass theory helps us to understand the initial phase of the coherent phonon oscillations for a given nanotube chirality and type. We compare these results to two different experiments for nanotubes: (i) micelle suspended tubes and (ii) aligned nanotube films. In the case of graphene nanoribbons, there are no experimental observations to date. We also discuss, based on the evaluation of the electronヨphonon interaction matrix elements, the initial phase of the coherent phonon amplitude and its dependence on the chirality and type. Finally, we discuss previously unpublished results for coherent phonon amplitudes in zigzag nanoribbons obtained using an effective mass theory.
dc.language.iso eng
dc.publisher IOP Publishing
dc.rights Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
dc.title Theory of coherent phonons in carbon nanotubes and graphene nanoribbons
dc.type Journal article
dc.contributor.funder National Science Foundation
dc.contributor.funder U.S. Department of Energy
dc.contributor.funder Welch Foundation
dc.citation.journalTitle Journal of Physics: Condensed Matter
dc.contributor.org Richard E. Smalley Institute for Nanoscale Science and Technology
dc.citation.volumeNumber 25
dc.embargo.terms 1 year
dc.type.dcmi Text
dc.identifier.doihttp://dx.doi.org/10.1088/0953-8984/25/14/144201
dc.identifier.pmid 23478856
dc.identifier.grantID OISE-0968405 (National Science Foundation)
dc.identifier.grantID DEFG02-06ER46308 (U.S. Department of Energy)
dc.identifier.grantID C-1509 (Welch Foundation)
dc.type.publication publisher version
dc.citation.firstpage 144201


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