Intertube Excitonic Coupling in Nanotube Van der Waals Heterostructures

Maria G. Burdanova, Ming Liu, Michael Staniforth, Yongjia Zheng, Rong Xiang, Shohei Chiashi, Anton Anisimov, Esko I. Kauppinen, Shigeo Maruyama, James Lloyd-Hughes*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Strong intertube excitonic coupling is demonstrated in 1D van der Waals heterostructures by examining the ultrafast response of radial C/BN/MoS2 core/shell/skin nanotubes to femtosecond infrared light pulses. Remarkably, infrared excitation of excitons in the semiconducting carbon nanotubes (CNTs) creates a prominent excitonic response in the visible range from the MoS2 skin, even with infrared photons at energies well below the bandgap of MoS2. Via classical analogies and a quantum model of the light–matter interaction these findings are assigned 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 MoS2 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 nanoscale coaxial cables.

Original languageEnglish
JournalAdvanced Functional Materials
DOIs
Publication statusE-pub ahead of print - 2021
MoE publication typeA1 Journal article-refereed

Keywords

  • excitons
  • nanotubes
  • ultrafast spectroscopy
  • van der Waals heterostructures

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