A1 Refereed original research article in a scientific journal
Dielectric Screening inside Carbon Nanotubes
Authors: Gordeev, Georgy; Wasserroth, Sören; Li, Han; Jorio, Ado; Flavel, Benjamin S.; Reich, Stephanie
Publisher: American Chemical Society
Publication year: 2024
Journal: Nano Letters
Journal name in source: Nano letters
Journal acronym: Nano Lett
Volume: 24
Issue: 26
First page : 8030
Last page: 8037
ISSN: 1530-6984
eISSN: 1530-6992
DOI: https://doi.org/10.1021/acs.nanolett.4c01668
Web address : https://doi.org/10.1021/acs.nanolett.4c01668
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/457031106
Dielectric screening plays a vital role in determining physical properties at the nanoscale and affects our ability to detect and characterize nanomaterials using optical techniques. We study how dielectric screening changes electromagnetic fields and many-body effects in nanostructures encapsulated inside carbon nanotubes. First, we show that metallic outer walls reduce the scattering intensity of the inner tube by 2 orders of magnitude compared to that of air-suspended inner tubes, in line with our local field calculations. Second, we find that the dielectric shift of the optical transition energies in the inner walls is greater when the outer tube is metallic than when it is semiconducting. The magnitude of the shift suggests that the excitons in small-diameter inner metallic tubes are thermally dissociated at room temperature if the outer tube is also metallic, and in essence, we observe band-to-band transitions in thin metallic double-walled nanotubes.
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Funding information in the publication:
G.G. and S.R. acknowledge the Focus Area NanoScale of Freie Universitaet Berlin and the supraFAB Research Center. S.R. acknowledges support by the Deutsche Forschungsgemeinschaft under Grant SPP 2244 (443275027) and the European Research Council ERC under Grant DarkSERS (772108). B.S.F. acknowledges support from the DFG under Grants FL 834/5-1, FL 834/7-1, FL 834/12-1, FL834/13-1, and FL 834/9-1. G.G. acknowledges funding from the Luxembourg National Research Fund (FNR) under Project [AWORD].
