Asymmetric excitation profiles in the resonance Raman response of armchair carbon nanotubes

Simple item page
dc.citation.firstpage205446en_US
dc.citation.journalTitlePhysical Review Ben_US
dc.citation.volumeNumber91en_US
dc.contributor.authorHároz, Erik H.en_US
dc.contributor.authorDuque, Juan G.en_US
dc.contributor.authorBarros, Eduardo B.en_US
dc.contributor.authorTelg, Hagenen_US
dc.contributor.authorSimpson, Jeffrey R.en_US
dc.contributor.authorWalker, Angela R. Highten_US
dc.contributor.authorKhripin, Constantine Y.en_US
dc.contributor.authorFagan, Jeffrey A.en_US
dc.contributor.authorTu, Xiaominen_US
dc.contributor.authorZheng, Mingen_US
dc.contributor.authorKono, Junichiroen_US
dc.contributor.authorDoorn, Stephen K.en_US
dc.date.accessioned2015-07-09T15:30:05Zen_US
dc.date.available2015-07-09T15:30:05Zen_US
dc.date.issued2015en_US
dc.description.abstractWe performed tunable resonance Raman spectroscopy on samples highly enriched in the (5,5), (6,6), (7,7), and (8,8) armchair structures of metallic single-wall carbon nanotubes. We present Raman excitation profiles (REPs) for both the radial breathing mode and G-band phonons of these species. G-band excitation profiles are shown to resolve the expected incoming and outgoing resonances of the scattering process. Notably, the profiles are highly asymmetric, with the higher-energy outgoing resonance weaker than the incoming resonance. These results are comparable to the asymmetric excitation profiles observed previously in semiconducting nanotubes, introduce a different electronic type, and broaden the structural range over which the asymmetry is found to exist. Modeling of the behavior with a third-order quantum model that accounts for the k dependence in energies and matrix elements, without including excitonic effects, is found to be insufficient for reproducing the observed asymmetry. We introduce an alternative fifth-order model in which the REP asymmetry arises from quantum interference introduced by phonon-mediated state mixing between the EM11 and K-momentum excitons. Such state mixing effectively introduces a nuclear coordinate dependence in the transition dipole moment and thus may be viewed as a non-Condon effect from a molecular perspective. This result unifies a molecularlike picture of nanotube transitions (introduced by their excitonic nature) with a condensed matter approach for describing their behavior.en_US
dc.identifier.citationHároz, Erik H., Duque, Juan G., Barros, Eduardo B., et al.. "Asymmetric excitation profiles in the resonance Raman response of armchair carbon nanotubes." <i>Physical Review B,</i> 91, (2015) American Physical Society: 205446. http://dx.doi.org/10.1103/PhysRevB.91.205446.en_US
dc.identifier.doihttp://dx.doi.org/10.1103/PhysRevB.91.205446en_US
dc.identifier.urihttps://hdl.handle.net/1911/80859en_US
dc.language.isoengen_US
dc.publisherAmerican Physical Societyen_US
dc.rightsArticle 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.en_US
dc.titleAsymmetric excitation profiles in the resonance Raman response of armchair carbon nanotubesen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
PhysRevB.91.205446.pdf
Size:
1.14 MB
Format:
Adobe Portable Document Format
Description:
Download
Collections
Faculty Publications
ECE Publications