Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 32, Issue 11, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202104969
Keywords
excitons; nanotubes; ultrafast spectroscopy; van der Waals heterostructures
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Funding
- Global Education Program (Russia)
- EPSRC (UK) [EP/N010825/1]
- JSPS KAKENHI [JP18H05329, JP19H02543, JP20H00220, JP20KK0114]
- JST, CREST, Japan [JPMJCR20B5]
- EPSRC [EP/N010825/1] Funding Source: UKRI
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Strong intertube excitonic coupling is demonstrated in 1D van der Waals heterostructures through the interaction of dipole-dipole Coulomb interactions and light-matter interactions. This leads to the creation of intertube biexcitons on short timescales and intertube excitons on longer timescales, which opens up new possibilities for multi-functional applications of these new nanoscale coaxial cables.
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.
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