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Complex Strain Scapes in Reconstructed Transition-Metal Dichalcogenide Moiré Superlattices
- 1.0571052 - ÚFCH JH 2024 RIV US eng J - Článek v odborném periodiku
Rodríguez Rodríguez, Álvaro - Varillas, Javier - Haider, Golam - Kalbáč, Martin - Frank, Otakar
Complex Strain Scapes in Reconstructed Transition-Metal Dichalcogenide Moiré Superlattices.
ACS Nano. Roč. 17, č. 8 (2023), s. 7787-7796. ISSN 1936-0851. E-ISSN 1936-086X
Grant CEP: GA ČR(CZ) GX20-08633X; GA MŠMT EF16_026/0008382
Grant ostatní: Ministerstvo školství, mládeže a tělovýchovy - GA MŠk(CZ) CZ.02.1.01/0.0/0.0/16_026/0008382
Institucionální podpora: RVO:61388955
Klíčová slova: Atomic Reconstruction * Moiré Superlattice * Molecular Dynamics * Raman Spectroscopy * Strain * Transition-Metal Dichalcogenide
Obor OECD: Physical chemistry
Impakt faktor: 17.1, rok: 2022
Způsob publikování: Open access
We investigate the intrinsic strain associated with the coupling of twisted MoS2/MoSe2 heterobilayers by combining experiments and molecular dynamics simulations. Our study reveals that small twist angles (between 0 and 2°) give rise to considerable atomic reconstructions, large moiré periodicities, and high levels of local strain (with an average value of ∼1%). Moreover, the formation of moiré superlattices is assisted by specific reconstructions of stacking domains. This process leads to a complex strain distribution characterized by a combined deformation state of uniaxial, biaxial, and shear components. Lattice reconstruction is hindered with larger twist angles (>10°) that produce moiré patterns of small periodicity and negligible strains. Polarization-dependent Raman experiments also evidence the presence of an intricate strain distribution in heterobilayers with near-0° twist angles through the splitting of the E2g1 mode of the top (MoS2) layer due to atomic reconstruction. Detailed analyses of moiré patterns measured by AFM unveil varying degrees of anisotropy in the moiré superlattices due to the heterostrain induced during the stacking of monolayers.
Trvalý link: https://hdl.handle.net/11104/0342363
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