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Intertube excitonic coupling in nanotube van der Waals heterostructures
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Burdanova, Maria G., Staniforth, Michael, Anisimov, Anton, Kauppinen, Esko I, Liu, Ming, Zheng, Yongjia, Xiang, Rong, Chiashi, Shohei, Maruyama, Shigeo and Lloyd-Hughes, James (2021) Intertube excitonic coupling in nanotube van der Waals heterostructures. Advanced Functional Materials . 2104969. doi:10.1002/adfm.202104969 (In Press)
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Official URL: https://doi.org/10.1002/adfm.202104969
Abstract
Strong intertube excitonic coupling is demonstrated in 1D van der Waals heterostructures by examining the ultrafast response of radial C/BN/MoS$_2$ core/shell/skin nanotubes to femtosecond infrared light pulses.
Remarkably, infrared excitation of excitons in the semiconducting CNTs creates a prominent excitonic response in the visible range from the MoS$_2$ skin, even with infrared photons at energies well below the bandgap of MoS$_2$. Via classical analogies and a quantum model of the light-matter interaction we assign these findings to intertube excitonic correlations. Dipole-dipole Coulomb interactions in the coherent regime produce intertube biexcitons, which persist for tens of femtoseconds, while on longer timescales ($>100$\,ps) hole tunneling -- from the CNT core, through the BN tunnel barrier, to the MoS$_2$ skin -- creates intertube excitons. Charge transfer and dipole-dipole interactions thus play prominent roles on different timescales, and establish new possibilities for the multi-functional use of these new nano-scale coaxial cables.
| Item Type: | Journal Article | |||||||||||||||||||||
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| Subjects: | Q Science > QC Physics | |||||||||||||||||||||
| Divisions: | Faculty of Science > Chemistry Faculty of Science > Physics |
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| Library of Congress Subject Headings (LCSH): | Exciton theory, Carbon nanotubes, Heterostructures, Van der Waals forces | |||||||||||||||||||||
| Journal or Publication Title: | Advanced Functional Materials | |||||||||||||||||||||
| Publisher: | Wiley | |||||||||||||||||||||
| ISSN: | 1616-301X | |||||||||||||||||||||
| Official Date: | 21 September 2021 | |||||||||||||||||||||
| Dates: |
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| Article Number: | 2104969 | |||||||||||||||||||||
| DOI: | 10.1002/adfm.202104969 | |||||||||||||||||||||
| Status: | Peer Reviewed | |||||||||||||||||||||
| Publication Status: | In Press | |||||||||||||||||||||
| Access rights to Published version: | Open Access | |||||||||||||||||||||
| RIOXX Funder/Project Grant: |
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