Resonance Raman signature of intertube excitons in compositionally-defined carbon nanotube bundles
| Autor: | Jared Crochet, Andrei Piryatinski, Erik H. Haroz, Angela R. Hight Walker, Jeffrey R. Simpson, Stephen K. Doorn, Oleksiy Roslyak, Hagen Telg, Juan G. Duque |
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| Rok vydání: | 2017 |
| Předmět: |
Nanotube
Materials science Science Exciton Resonance Raman spectroscopy General Physics and Astronomy 02 engineering and technology Carbon nanotube 01 natural sciences General Biochemistry Genetics and Molecular Biology Article law.invention Delocalized electron symbols.namesake Condensed Matter::Materials Science law 0103 physical sciences lcsh:Science 010306 general physics Multidisciplinary Condensed matter physics Fano resonance Resonance General Chemistry 021001 nanoscience & nanotechnology Condensed Matter::Mesoscopic Systems and Quantum Hall Effect symbols lcsh:Q 0210 nano-technology Raman spectroscopy |
| Zdroj: | Nature Communications Nature Communications, Vol 9, Iss 1, Pp 1-7 (2018) |
| ISSN: | 2041-1723 |
| Popis: | Electronic interactions in low-dimensional nanomaterial heterostructures can lead to novel optical responses arising from exciton delocalization over the constituent materials. Similar phenomena have been suggested to arise between closely interacting semiconducting carbon nanotubes of identical structure. Such behavior in carbon nanotubes has potential to generate new exciton physics, impact exciton transport mechanisms in nanotube networks, and place nanotubes as one-dimensional models for such behaviors in systems of higher dimensionality. Here we use resonance Raman spectroscopy to probe intertube interactions in (6,5) chirality-enriched bundles. Raman excitation profiles for the radial breathing mode and G-mode display a previously unobserved sharp resonance feature. We show the feature is evidence for creation of intertube excitons and is identified as a Fano resonance arising from the interaction between intratube and intertube excitons. The universality of the model suggests that similar Raman excitation profile features may be observed for interlayer exciton resonances in 2D multilayered systems. Bundles of single-wall carbon nanotubes with enriched chirality can be used as model systems for exploring exciton physics in low-dimensional nanostructures. Here, the authors use resonant Raman spectroscopy to probe intertube interactions in bundles of (6,5)-enriched carbon nanotubes, and observe a Fano resonance arising from coupling between intertube and intratube excitons. |
| Databáze: | OpenAIRE |
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