Broadband Optical and Terahertz Properties of Atomically Thin 1D van der Waals Heterostructures

¹ Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology, 9 Institutsky Lane, 141700 Dolgoprudny, Russia
² Institute of Solid State Physics of the Russian Academy of Sciences, Chernogolovka, 142432, Russia
³ Department of Mechanical Engineering, The University of Tokyo, Tokyo, 113-8656 Japan
⁴ Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology, Institutskii Pereulok 9, 141700 Dolgoprudny, Russia
⁵ Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilov str. 38, 119991, Moscow
⁶ Moscow Institute of Physics and Technology (National Research University), Institutskii per. 9, 141701 Dolgoprudny, Moscow Region, Russia
⁷ University of Warwick, Department of Physics, Gibbet Hill Road, Coventry, CV4 7AL UK

Academic Editor: Guanying Chen

Published: 24 April 2022 by MDPI in The 3rd International Online Conference on Nanomaterials session Synthesis, Characterization, and Properties of Nanomaterials

Abstract:

We examined the optoelectronic properties of atomically thin 1D van der Waals heterostructures comprising the single-walled carbon nanotubes (NT) wrapped by insulating BN NT layers and MoS₂ NT outer layers (C@BN@MoS₂NT). We will present the equilibrium properties of such materials (through optical absorption, transmission, reflection, ellipsometry, Raman scattering, THz spectroscopy, and XPS studies) along with the transmission electron microscopy measurements. Through all of these techniques, we evaluated intertube excitonic interactions in addition to the charge transport characteristics of a large area 1D heterostructure. In addition, non-equilibrium, ultrafast pump–probe spectroscopy across the visible and terahertz frequency ranges identified that, in the MoS₂ nanotubes, excitons coexisted with a prominent population of free charges.

Keywords: nanotubes, van der Waals heterostructures, ultrafast, ellipsometry, terahertz, XPS

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