Self-organized quantum dots in marginally twisted MoSe2/WSe2 and MoS2/WS2 bilayers

Moiré superlattices in twistronic heterostructures are a powerful tool for materials engineering. In marginally twisted (small misalignment angle, θ ) bilayers of nearly lattice-matched two-dimensional (2D) crystals moiré patterns take the form of domains of commensurate stacking, separated by a net...

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Bibliographic Details
Published in:NPJ 2D materials and applications 2022-10, Vol.6 (1), p.1-7, Article 74
Main Authors: Enaldiev, V. V., Ferreira, F., McHugh, J. G., Fal’ko, Vladimir I.
Format: Article
Language:English
Subjects:
639/301/1019/1021
639/925/357/1018
Chemistry and Materials Science
Crystal lattices
Domain walls
Doppler effect
Electrons
Excitons
Heterostructures
Lattice matching
Materials engineering
Materials Science
Misalignment
Moire patterns
Nanotechnology
Photons
Quantum dots
Red shift
Superlattices
Surfaces and Interfaces
Thin Films
Transition metal compounds
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Summary:Moiré superlattices in twistronic heterostructures are a powerful tool for materials engineering. In marginally twisted (small misalignment angle, θ ) bilayers of nearly lattice-matched two-dimensional (2D) crystals moiré patterns take the form of domains of commensurate stacking, separated by a network of domain walls (NoDW) with strain hot spots at the NoDW nodes. Here, we show that, for type-II transition metal dichalcogenide bilayers MoX 2 /WX 2 (X=S, Se), the hydrostatic strain component in these hot spots creates quantum dots for electrons and holes. We investigate the electron/hole states bound by such objects, discussing their manifestations via the intralayer intraband infrared transitions. The electron/hole confinement, which is strongest for θ  
ISSN:2397-7132
2397-7132
DOI:10.1038/s41699-022-00346-0