Intertube Excitonic Coupling in Nanotube Van der Waals Heterostructures

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2022-03-09
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Mcode
Degree programme
Language
en
Pages
Series
Advanced Functional Materials
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 useof these new nanoscale coaxial cables.
Description
Funding Information: M.G.B. acknowledges support from the Global Education Program (Russia) for a Ph.D. scholarship. The UK authors acknowledge the EPSRC (UK) for funding under grant EP/N010825/1. Part of this work was supported by JSPS KAKENHI (grant numbers JP18H05329, JP19H02543, JP20H00220, and JP20KK0114) and by JST, CREST grant number JPMJCR20B5, Japan. Publisher Copyright: © 2021 The Authors. Advanced Functional Materials published by Wiley-VCH GmbH
Keywords
excitons, nanotubes, ultrafast spectroscopy, van der Waals heterostructures
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Citation
Burdanova , M G , Liu , M , Staniforth , M , Zheng , Y , Xiang , R , Chiashi , S , Anisimov , A , Kauppinen , E I , Maruyama , S & Lloyd-Hughes , J 2022 , ' Intertube Excitonic Coupling in Nanotube Van der Waals Heterostructures ' , Advanced Functional Materials , vol. 32 , no. 11 , 2104969 . https://doi.org/10.1002/adfm.202104969