AI Article Synopsis
- Moiré superlattices created by stacking 2D crystals explore new functionalities through the interaction of electronic excitations and atomic rearrangements.
- The study found that moiré superlattices of single-layer MoS and WSe display torsional strains with opposite chirality that persist regardless of twist angle.
- These distortions cause changes in the Raman spectra and consistent redshifts in intralayer excitons, indicating a key relationship between structure and properties in moiré superlattices.
Article Abstract
Moiré superlattices formed by stacking two-dimensional crystals have reinvigorated the pursuit for emergent functionalities of engineered superlattices. Unique optical characteristics can be realized from the interplay between the electronic excitations and the atomic rearrangements owing to their intrinsic softness. Although large-scale reconstructions have been identified at small twist angles, they have been treated as being rigid at large twist angles. Here, we report that moiré superlattices made from single layers of MoS and WSe exhibit a pair of torsional strains with opposite chirality irrespective of the twist angle. The whirlpool-shaped periodic lattice distortions introduce fuzziness in the Raman spectra and universal redshifts to the intralayer excitons for all twist angles. We show that both of these modulations become weaker as the twist angle increases but do not disappear, whereas they are turned off when the constituent layers are not tightly coupled, thus establishing an essential structure-property relationship for moiré superlattices.
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| http://dx.doi.org/10.1038/s41563-022-01240-2 | DOI Listing |
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