Asymmetric excitation profiles in the resonance Raman response of armchair carbon nanotubes
dc.citation.firstpage | 205446 | |
dc.citation.journalTitle | Physical Review B | |
dc.citation.volumeNumber | 91 | |
dc.contributor.author | Hároz, Erik H. | |
dc.contributor.author | Duque, Juan G. | |
dc.contributor.author | Barros, Eduardo B. | |
dc.contributor.author | Telg, Hagen | |
dc.contributor.author | Simpson, Jeffrey R. | |
dc.contributor.author | Walker, Angela R. Hight | |
dc.contributor.author | Khripin, Constantine Y. | |
dc.contributor.author | Fagan, Jeffrey A. | |
dc.contributor.author | Tu, Xiaomin | |
dc.contributor.author | Zheng, Ming | |
dc.contributor.author | Kono, Junichiro | |
dc.contributor.author | Doorn, Stephen K. | |
dc.date.accessioned | 2015-07-09T15:30:05Z | |
dc.date.available | 2015-07-09T15:30:05Z | |
dc.date.issued | 2015 | |
dc.description.abstract | We 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. | |
dc.identifier.citation | Hároz, 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. | |
dc.identifier.doi | http://dx.doi.org/10.1103/PhysRevB.91.205446 | |
dc.identifier.uri | https://hdl.handle.net/1911/80859 | |
dc.language.iso | eng | |
dc.publisher | American Physical Society | |
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 | Asymmetric excitation profiles in the resonance Raman response of armchair carbon nanotubes | |
dc.type | Journal article | |
dc.type.dcmi | Text | |
dc.type.publication | publisher version |
Files
Original bundle
1 - 1 of 1
Loading...
- Name:
- PhysRevB.91.205446.pdf
- Size:
- 1.14 MB
- Format:
- Adobe Portable Document Format
- Description: