Proceedings of nanoGe Fall Meeting 2021 (NFM21)
DOI: https://doi.org/10.29363/nanoge.nfm.2021.061
Publication date: 23rd September 2021
Excitons dominate the optics of atomically-thin transition metal dichalcogenides and 2D van der Waals heterostructures. Interlayer 2D excitons, with an electron and a hole residing in different layers, form rapidly in heterostructures either via direct charge transfer or via Coulomb interactions that exchange energy between layers. Here I will discuss our recent work on the light-matter interaction on quasi-1D van der Waals heterostructures consisting of C/BN/MoS2 core/shell/skin nanotubes. I will describe how strong intertube excitonic coupling effects between excitons in CNTs and MoS2 NTs are evident under pulsed infrared excitation of excitons in the semiconducting CNTs. We observed a rapid (sub-picosecond) excitonic response in the visible range from the MoS2 skin following IR excitation, which we attribute to intertube biexcitons mediated by dipole-dipole Coulomb interactions in the coherent regime. On longer (>100ps) timescales hole transfer from the CNT core to the MoS2 skin further modified the MoS2's absorption. Our direct demonstration of intertube excitonic interactions and charge transfer in 1D van der Waals heterostructures suggests future applications in infrared and visible optoelectronics using these radial heterojunctions.
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