Resonance Raman signature of intertube excitons in compositionally-defined carbon nanotube bundles

Jeffrey R. Simpson, Oleksiy Roslyak, Juan G. Duque, Erik H. Hároz, Jared J. Crochet, Hagen Telg, Andrei Piryatinski (), Angela R. Hight Walker () and Stephen K. Doorn ()
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Jeffrey R. Simpson: National Institute of Standards and Technology (NIST)
Oleksiy Roslyak: Fordham University
Juan G. Duque: Los Alamos National Laboratory
Erik H. Hároz: Los Alamos National Laboratory
Jared J. Crochet: Los Alamos National Laboratory
Hagen Telg: Los Alamos National Laboratory
Andrei Piryatinski: Los Alamos National Laboratory
Angela R. Hight Walker: National Institute of Standards and Technology (NIST)
Stephen K. Doorn: Los Alamos National Laboratory

Nature Communications, 2018, vol. 9, issue 1, 1-7

Abstract: Abstract 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.

Date: 2018
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DOI: 10.1038/s41467-018-03057-7

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