Diameter dependence of TO phonon frequencies and the Kohn anomaly in armchair single-wall carbon nanotubes

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dc.citation.firstpage245422en_US
dc.citation.journalTitlePhysical Review Ben_US
dc.citation.volumeNumber90en_US
dc.contributor.authorTelg, Hagenen_US
dc.contributor.authorHároz, Erik H.en_US
dc.contributor.authorDuque, Juan G.en_US
dc.contributor.authorTu, Xiaominen_US
dc.contributor.authorKhripin, Constantine Y.en_US
dc.contributor.authorFagan, Jeffrey A.en_US
dc.contributor.authorZheng, Mingen_US
dc.contributor.authorKono, Junichiroen_US
dc.contributor.authorDoorn, Stephen K.en_US
dc.date.accessioned2015-02-02T18:00:45Zen_US
dc.date.available2015-02-02T18:00:45Zen_US
dc.date.issued2014en_US
dc.description.abstractWe present resonant Raman scattering experiments on nanotube samples enriched in metallic armchair single-wall carbon nanotubes (SWCNTs). We establish the transverse optical (ATO) phonon frequency for the (5,5) through (10,10) armchair species, ranging in diameter from 0.68 to 1.36 nm. The frequencies show a strong diameter dependence similar to that previously observed in semiconducting nanotubes. We show that the ATO frequencies in armchair SWCNTs are dramatically upshifted from those of semiconducting SWCNTs. Furthermore, using electrochemical doping, we demonstrated that the ATO frequencies in armchair SWCNTs are independent of the position of the Fermi level. These results suggest that the upshift is a result of a Kohn anomaly involving a forward-scattering mechanism of electrons close to the Fermi level. This is in contrast to the well-known Kohn anomaly that dominates the downshift of the ALO and E2g phonons in nonarmchair metallic SWCNTs and graphene, respectively.en_US
dc.identifier.citationTelg, Hagen, Hároz, Erik H., Duque, Juan G., et al.. "Diameter dependence of TO phonon frequencies and the Kohn anomaly in armchair single-wall carbon nanotubes." <i>Physical Review B,</i> 90, (2014) American Physical Society: 245422. http://dx.doi.org/10.1103/PhysRevB.90.245422.en_US
dc.identifier.doihttp://dx.doi.org/10.1103/PhysRevB.90.245422en_US
dc.identifier.urihttps://hdl.handle.net/1911/79020en_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.titleDiameter dependence of TO phonon frequencies and the Kohn anomaly in armchair single-wall carbon nanotubesen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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