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High-Frequency Elastic Coupling at the Interface of van der Waals Nanolayers Imaged by Picosecond Ultrasonics

Abstract : Although the topography of van de Waals (vdW) layers and heterostructures can be imaged by scanning probe microscopy, high-frequency interface elastic properties are more difficult to assess. These can influence the stability, reliability, and performance of electronic devices that require uniform layers and interfaces. Here, we use picosecond ultrasonics to image these properties in vdW layers and heterostructures based on well-known exfoliable materials, i.e., InSe, hBN, and graphene. We reveal a strong, uniform elastic coupling between vdW layers over a wide range of frequencies of up to tens of gigahertz (GHz) and in-plane areas of 100 μm2. In contrast, the vdW layers can be weakly coupled to their supporting substrate, behaving effectively as free-standing membranes. Our data and analysis demonstrate that picosecond ultrasonics offers opportunities to probe the high-frequency elastic coupling of vdW nanolayers and image both “perfect” and “broken” interfaces between different materials over a wide frequency range, as required for future scientific and technological developments.
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https://hal-univ-lemans.archives-ouvertes.fr/hal-02456809
Contributeur : Samuel Raetz <>
Soumis le : lundi 27 janvier 2020 - 15:49:44
Dernière modification le : lundi 3 mai 2021 - 17:45:40

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Jake Greener, Elton de Lima Savi, Andrey Akimov, Samuel Raetz, Zakhar Kudrynskyi, et al.. High-Frequency Elastic Coupling at the Interface of van der Waals Nanolayers Imaged by Picosecond Ultrasonics. ACS Nano, American Chemical Society, 2019, 13 (10), pp.11530-11537. ⟨10.1021/acsnano.9b05052⟩. ⟨hal-02456809⟩

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