Fundamental optical processes in armchair carbon nanotubes
| dc.citation.firstpage | 1411 | en_US |
| dc.citation.journalTitle | Nanoscale | en_US |
| dc.citation.lastpage | 1439 | en_US |
| dc.citation.volumeNumber | 5 | en_US |
| dc.contributor.author | Haroz, Erik H. | en_US |
| dc.contributor.author | Duque, Juan G. | en_US |
| dc.contributor.author | Tu, Xiaomin | en_US |
| dc.contributor.author | Zheng, Ming | en_US |
| dc.contributor.author | Walker, Angela R. Hight | en_US |
| dc.contributor.author | Hauge, Robert H. | en_US |
| dc.contributor.author | Doorn, Stephen K. | en_US |
| dc.contributor.author | Kono, Junichiro | en_US |
| dc.contributor.org | Richard E. Smalley Institute for Nanoscale Science and Technology | en_US |
| dc.date.accessioned | 2013-03-20T19:31:04Z | en_US |
| dc.date.available | 2014-03-21T05:10:10Z | en_US |
| dc.date.issued | 2013 | en_US |
| dc.description.abstract | Single-wall carbon nanotubes provide ideal model one-dimensional (1-D) condensed matter systems in which to address fundamental questions in many-body physics, while, at the same time, they are leading candidates for building blocks in nanoscale optoelectronic circuits. Much attention has been recently paid to their optical properties, arising from 1-D excitons and phonons, which have been revealed via photoluminescence, Raman scattering, and ultrafast optical spectroscopy of semiconducting carbon nanotubes. On the other hand, dynamical properties of metallic nanotubes have been poorly explored, although they are expected to provide a novel setting for the study of electronﾖhole pairs in the presence of degenerate 1-D electrons. In particular, (n,n)-chirality, or armchair, metallic nanotubes are truly gapless with massless carriers, ideally suited for dynamical studies of TomonagaﾖLuttinger liquids. Unfortunately, progress towards such studies has been slowed by the inherent problem of nanotube synthesis whereby both semiconducting and metallic nanotubes are produced. Here, we use post-synthesis separation methods based on density gradient ultracentrifugation and DNA-based ion-exchange chromatography to produce aqueous suspensions strongly enriched in armchair nanotubes. Through resonant Raman spectroscopy of the radial breathing mode phonons, we provide macroscopic and unambiguous evidence that density gradient ultracentrifugation can enrich ensemble samples in armchair nanotubes. Furthermore, using conventional, optical absorption spectroscopy in the nearinfrared and visible range, we show that interband absorption in armchair nanotubes is strongly excitonic. Lastly, by examining the G-band mode in Raman spectra, we determine that observation of the broad, lower frequency (G!) feature is a result of resonance with non-armchair “metallic” nanotubes. These !ndings regarding the fundamental optical absorption and scattering processes in metallic carbon nanotubes lay the foundation for further spectroscopic studies to probe many-body physical phenomena in one dimension. | en_US |
| dc.embargo.terms | 1 year | en_US |
| dc.identifier.citation | Haroz, Erik H., Duque, Juan G., Tu, Xiaomin, et al.. "Fundamental optical processes in armchair carbon nanotubes." <i>Nanoscale,</i> 5, (2013) The Royal Society of Chemistry: 1411-1439. http://dx.doi.org/10.1039/c2nr32769d. | en_US |
| dc.identifier.doi | http://dx.doi.org/10.1039/c2nr32769d | en_US |
| dc.identifier.uri | https://hdl.handle.net/1911/70795 | en_US |
| dc.language.iso | eng | en_US |
| dc.publisher | The Royal Society of Chemistry | en_US |
| 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. | en_US |
| dc.title | Fundamental optical processes in armchair carbon nanotubes | en_US |
| dc.type | Journal article | en_US |
| dc.type.dcmi | Text | en_US |
| dc.type.publication | publisher version | en_US |