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

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    Telg, Hagen; Hároz, Erik H.; Duque, Juan G.; Tu, Xiaomin; Khripin, Constantine Y.; More... Fagan, Jeffrey A.; Zheng, Ming; Kono, Junichiro; Doorn, Stephen K. Less...
    Date
    2014
    Abstract
    We 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.
    Citation
    Telg, 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." Physical Review B, 90, (2014) American Physical Society: 245422. http://dx.doi.org/10.1103/PhysRevB.90.245422.
    Published Version
    http://dx.doi.org/10.1103/PhysRevB.90.245422
    Type
    Journal article
    Publisher
    American Physical Society
    Citable link to this page
    https://hdl.handle.net/1911/79020
    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.
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    Home | FAQ | Contact Us | Privacy Notice | Accessibility Statement
    Managed by the Digital Scholarship Services at Fondren Library, Rice University
    Physical Address: 6100 Main Street, Houston, Texas 77005
    Mailing Address: MS-44, P.O.BOX 1892, Houston, Texas 77251-1892
    Site Map